2021 Late Model Rulebook

2021 Late Model Rules

For any technical questions, please thoroughly read these rules and any applicable NASCAR Weekly Racing Series Late Model Stock rules, then email tech@staffordspeedway.com.

2021 Late Model Rules Available in PDF format

2021 Late Model Rule Changes
PREFACE
20G- 10.6 REAR AXLE
20G- 11 FRAMES

PREFACE

The rules herein shall refer to Stafford Motor Speedway as “SMS”. These rules are intended to create affordable and fair competition. While they offer a good outline, every item cannot be covered by a written rule. If you have questions regarding something not detailed in these rules, please consult an SMS Official for clarification before proceeding. These rules are for SMS only with no expressed or implied agreement with any other speedway or series as to their interpretation, implementation and method of inspection by their technical inspectors and officials. No car, component or equipment will be considered as having been approved by reason of having previously passed through inspection unobserved. No car, component or equipment will be considered as having passed inspection for the event until the finish is made official. The request for new or modified parts or componentsnot specifically addressed in the current version of this rule book must be submitted in writing, via email, to tech@staffordspeedway.com for consideration of approval on or prior to August 1, 2020 unless otherwise authorized by SMS to be considered for competition for the 2021 season.

All equipment is subject to the approval of SMS Officials. You may be assessed penalties including but not limited to: added weight, fines, loss of points, loss of handicapping, and suspension, car parts, components, and/or equipment deemed as not in compliance with these rules. Any car part, component, and/or equipment which does not conform to specifications or tolerances contained in the 2021 rule book or is not otherwise approved by SMS may not be used in competition in 2021.

By engaging in competition at SMS, you hereby agree to have read the 2021 NASCAR Weekly Racing Series rulebook, The 2021 SMS General rulebook and the 2021 SMS Late Model rulebook.

All 2021 NASCAR Weekly Racing Series (NWRS for Late Model Stock) rules will be enforced for the SMS Late Models, when applicable, with the following changes and/or additions (EIRI). SMS Officials decisions regarding rules are final and non-appealable.

DRIVER ELIGIBILITY – All SMS Late Model drivers must have a NASCAR CHD (Charger Division Driver) license. Drivers competing in the Late Model division at SMS will not be permitted in the Street Stock, Limited Late Model, or SK Light Modified® divisions on the same event date. Drivers must be minimum 16 years of age.

20G- 1 COMPETING CHASSIS- American made chassis with a minimum of 108” wheelbase as factory listed for that year and model. No Firebirds, Camaros, Mustangs or two passenger sports cars. No convertibles, station wagons, or using of their frames for other models. Body may be different from frame and engine but engine and frame parts must be from the same corporate line (i.e. GM, Ford, Chrysler). If you are in doubt about the eligibility of a make or model, check before you build it.

20G – 1.3 APPROVED COMPETITION MODELS-
Please note that the Five Star gen 6 body and the AR Gen 6 re-skin body (individual panels or complete body kits) are not approved for use in 2020.
The following are the 2020 approved body models eligible for competition:

STEEL
YEAR	MAKE	MODEL
2000-2005	Chevrolet	Monte Carlo
2006	Chevrolet	Monte Carlo SS
2001-2004	Dodge	Intrepid
2005-2006	Dodge	Charger
2000-2005	Ford	Taurus
2006	Ford	Fusion
2000-2003	Pontiac	Grand Prix

 

COMPOSITE
YEAR	MAKE	MODEL
2012 Metric	Ford	Mustang
2012 Metric	Chevrolet	Camaro
2007-2013	Chevrolet	Impala
2007-2013	Dodge	Charger
2007-2013	Toyota	Camry
2007-2013	Ford	Fusion
2007-2013	Chevrolet	Monte Carlo SS
2009-2013	Cadillac	CTS
2009-2013	Ford	Lincoln MKS
2009-2013	Pontiac	G8
2009-2013	Chevrolet	Malibu

20G- 2.1 BODIES – Bodies and their installations must be SMS approved. Body dimensions must remain as manufactured except for changes which may be necessary for tire clearance.
A. Cars must have complete bodies, which includes the hood, roof, front fenders, doors, quarter panels, front and rear bumper covers. The minimum thickness for any exterior sheet metal body part of the 2000 through 2006 steel body cars must be 24 gauge (0.025 inch thick) magnetic sheet steel.
B. Body mounts may be solid or adjustable, and may be made of metal, plastic or Polycarbonate.
C. Installation of aerodynamic or air directional devices of any type are not permitted. Streamlining/contouring of body panels or windows is not permitted. Grilles must resemble OEM Stock in their dimension and location.
D. A full windshield and full rear window is mandatory. The windshield and rear window must be installed in their OEM Stock position, and must be sealed to the window beds using removable sealers/adhesives.
E. Fenders and quarter panels may not be modified except for wheel or tire clearance.
F. The interior area of the car must be completely enclosed from front to rear with firewalls made of not less than 24 gage (0.025 inch thick) magnetic sheet steel. The floor area on the left side must not be lower than the top of the frame rails except directly under the seat where the floor may be dropped not lower than one (1) inch above the bottom of the frame rail. The floor area on the right side of the seat may be raised a maximum of eight (8) inches to the top of the drive shaft tunnel and extend to the right door panel. All interior panels must be welded.
G. Cars must be equipped with approved front and rear bumper covers for your year/make/model. Installation of aerodynamic or air directional devices of any type are not permitted. All SMS Late Models are subject to the NASCAR LMS body measurements. SMS Officials will use NASCAR LMS templates to insure conformity. All vertical measurements listed in the NASCAR rulebook are plus one (1) inch for SMS dimensioning. With the exception of the 18¼” minimum deck lid length, all other measurements listed that say minimum or maximum are considered as exact for the SMS Late Model division. All listed tolerances are built into the templates from the manufacturers. All listed vertical body measurements are checked with car at ride height. Older Late Models and Limited Late Models with higher roof heights will be adjusted according to the rule.

20G- 2.2 OVERALL CAR WEIGHT- All specified weight requirements are with the driver and race gear, seated in the car. The minimum weight at all times is 3,000 pounds. The maximum left side weight percentage is 56%. A “lead box” made from magnetic steel rectangular or square tubing may be welded to the outside edge of the driver’s side frame rail. The bottom of the lead box may not be lower than the frame where it is attached. The lead box must have suitable end caps or bolts used to retain the lead. All lead boxes shall be acceptable to SMS Officials. All other weight must be bolted to the inside of the frame rail and above the lowest edge of the frame rail where the weight is mounted. Any car found to be under the minimum overall car weight allowance will be penalized one position for every pound under the minimum weight. This does not apply to left side weight requirement.

20G- 2.3 ADDED CAR WEIGHT- Lead is the only acceptable form of added weight. Weight must be in block form in no less than 5 pound blocks. Weight must be painted white with your car number on it. No weight is permitted inside the driver’s compartment. Weight must be encased in steel and welded or bolted to the chassis or frame with two or more (Grade 5 minimum) bolts, minimum 3/8″ diameter. All weight must be placed between the frame rails, and not lower than the frame at the point at which it is attached, and cannot be mounted forward of the front spindles. No weight is allowed outside or below the frame rails. Weight is not permitted inside any cross member, roll bar or any inaccessible area or component. “Lead boxes”, if used, must have one end cap removable for inspection purposes. Weight shifting devices of any type are not permitted

20G- 2.4 CAR WEIGHTS AFTER RACE- Cars will be weighed as they come off the race track, with the driver and helmet positioned in the seat. Nothing may be added, removed or changed on the car prior to being scaled. An amount equal to one half of one percent (.5%) of the total weight will be added to scale reading for loss in weight due to race wear. Minimum post-race weight will be 2,985 lbs.

20G- 3 DETAILED BODY REQUIREMENTS-

Please note that the Five Star gen 6 (2019) body and the AR gen 6 re-skin body (individual panels or complete) are not approved for use in 2021.
All side panels, nose and tail, roof and roof posts must be from the approved list.
Unapproved bodies and/or unapproved individual body panels are not permitted for competition.
You may not compete without the roof, windshield, hood and trunk lid in place.
For detailed body installation and guideline dimensions, refer to the body diagram pages in the Nascar Late Model Stock rulebook. OEM Stock or steel aftermarket replacement bodies may be used. Hood and roof may be made of fiberglass. Front fenders and rear quarter panels may be steel or plastic. All body panels must retain the OEM Stock appearance and dimensions as your make/model/year, and must be mounted in the OEM Stock location on the frame. Stock window openings must be maintained. All exterior chrome trim ornaments, outside mirrors and door handles must be removed. Replacement body parts must meet SMS templates. Body skirts or lower body rocker panel flares are not permitted.
All body panels, frame rails, tubing and chassis mounts (except exhaust system) must maintain a minimum of 5” ride height at all times.

20G – 3.1 AERODYNAMIC DEVICES- Installation of aerodynamic or air directional devices of any type are not permitted. Streamlining/contouring of body panels or windows is not permitted.

20G- 3.1.1 FRONT AIR DAM- Air dam must maintain 5” ground clearance at all times. All support brackets must be mounted to the rear of the air dam. Brackets and mounts must not be used or installed as air directional devices. The leading edge of the air dam may not extend more than three (3) inches forward of the bumper measured at any point across the bumper. On all approved models, the leading edge of the air dam, when measured from the centerline of the right front spindle must not exceed 46 inches and must not be less than 45 inches. Front air dam extensions, made of flexible plastic type material, are permitted to be attached to the bottom of the front air dam (bumper cover). It must be flush mounted, stationary, securely fastened, single layer, not exceeding a maximum of 3/16 inch thick and maximum of five (5) inches in height and must be mounted parallel to the bumper cover. The air dam extension must be secured in a manner that will prevent movement of the air dam extension while in competition and maintain a minimum ground clearance of five (5) inches.

20G- 3.1.2 REAR SPOILERS- A non-adjustable freestanding clear polycarbonate solid rear spoiler is permitted. The rear spoiler must be 5” in height and 60″ in width. The top 3″ in height of the rear spoiler must be clear polycarbonate.
Spoiler must be placed in the center (left-to-right) and at the rear edge of the trunk lid. The spoiler angle must be set at a minimum of 60 degrees. A maximum of two (2) one (1) inch wide non-adjustable supports on the front of the rear spoiler, or six (6) Five Star or ARP rear spoiler braces are permitted. All spoilers are subject to SMS Officials approval.

20G- 3.2 GLASS– All windows / glass must be clear (no tint permitted). A 1” wide border may be painted/taped on the sides of the front windshield. Full windshield is required made of clear 1/8” thick Polycarbonate or clear safety glass. The windshield must maintain the OEM Stock angle and fit the SMS template. The windshield must have a minimum of two (2) metal straps or braces 1/8 inch by one (1) inch installed inside the windshield. The straps must be bolted to the roof panel or roll bar at the top and the dash panel at the bottom with minimum 5/16 inch diameter bolts. A piece of rubber stripping must be installed between the windshield and straps. The straps must be installed in a manner that will not obstruct the vision of the driver. Windshield fasteners must be acceptable to SMS Officials. Driver and/or passenger side windows are not permitted.

20G- 3.2.2 REAR WINDOW- Full clear polycarbonate or clear safety glass rear window is mandatory. Two (2) metal straps or braces 1/8 inch by one (1) are required inside and outside. The rear window must maintain the OEM Stock angle and fit the SMS template. Access holes in the rear window for the rear jacking bolts must not exceed a maximum diameter of 1-1/4 inches. The rear window must be securely fastened in place with bolts or rivets.

20G- 3.2.3 SIDE WINDOW GLASS/ WINDOW NET- All door window (side) glass must be removed. A clear flat polycarbonate vent deflector panel may be installed at the bottom of the windshield “A” post. The deflector may extend a maximum of eight (8) inches rearward from the lower rear edge of the “A” post. The rear edge of the vent deflector must be vertical.

Quarter window openings must maintain the OEM Stock size, shape and location for your year/make/model. Quarter windows are mandatory, and they must be flat, clear polycarbonate and must cover the entire quarter window opening. If quick release fasteners are used, they must be the flush mount type. All other fasteners must be acceptable to SMS Officials. Only one (1) air inlet in each quarter window is permitted. The maximum hose size is three (3) inches. Ducts that are installed in the direction to create vacuum (suction) are not be permitted.

WINDOW NET– A commercially manufactured, SFI rated nylon window net must be installed in the driver’s side door window opening. It must be positioned to cover the entire window opening. Window nets may not be used beyond three (3) years from the date of manufacture. The window net must be rib type, made from minimum ¾ inch, maximum one (1) inch wide nylon material with a minimum one (1) inch and a maximum 2-1/4 inches square opening between the ribs. The minimum window net size must be must be 22 inches wide by 16 inches high. All window net mounts must be a minimum ½ inch diameter solid steel rod on the bottom and a minimum one (1) inch wide by 3/16 inch thick flat steel or a minimum ½ inch diameter solid steel rod on the top, with mounts welded to the roll cage. The window net must fit tight and be secured with a lever-type quick release latch. The lever must be secured by a detent ball in the lever and may be supplemented by Velcro® fastener only – pins or clips are not permitted. The latch must mount at the top in the front to roof bar (#3) and release from the inside.

20G – 3.2.4 HEADLIGHTS/TAILLIGHTS- Headlight, parking light, upper grille and taillight decals must be installed and be acceptable to SMS Officials.

20G- 3.2.5 REAR VIEW MIRROR- Only one (1) single image rear view mirror, mounted at the top of the windshield, no larger than 8” X 2” is permitted. Oversized mirrors may be blacked out by the use of paint only, to obtain the 8” X 2” maximum reflective area.

20G- 3.3 DASHBOARD- Stock unit may be removed but must be replaced with magnetic sheet steel, a minimum of 24-gage (0.025 inch thick), of similar design, and the full width of the body. All cars should have a removable inspection panel with a minimum size of 10” (ten) by 10” (ten) or 8” (eight) by 18” (eighteen) on top of the dash on the driver’s side for inspection of all wiring under the dash panel.

20G- 3.4 FIREWALLS-
A. Front firewall must be no further than 2.250″ from the front edge of frame rails, and be made of minimum .031″ magnetic sheet metal with all holes covered using sheet metal a minimum of .031″ thickness. The front firewall must extend down to the top of the frame. The bottom 8.0″ may angle no more than 70 Degrees, before going upward at 90 Degrees.
B. Rear firewall must be made of minimum .031″ magnetic sheet metal securely installed over the rear seat back brace and top shelf or “hat rack”, completely closing off the trunk compartment.
C. The top shelf or “hat rack” must be positioned horizontal and approximately level, attaching to bar #7. On the driver side of the hat rack, there must be a containment area for the seat belts. This can be constructed by making a cut out 42″ from the back edge of the hat rack. The inverted box should go from the top of the hat rack to the top of the #6 bar. This box should be approximately 13.500″ by 8.250″ and be angled at 70 degrees and must be welded in place.
D. The interior area of the car must be completely enclosed from front to rear with fire walls made of not less than 22 gage (.031 inch thick) magnetic sheet steel. The floor area on the left side must not be lower than the top of the frame rails except an area maximum 24 inches by 24 inches directly under the seat where the floor may be dropped not lower than two (2) inches above the bottom of the frame rail. The floor area on the right side of the seat may be a maximum eight (8) inches to the top of the driveshaft tunnel and extend to the right door panel. All interior panels must be welded. Door bars may not be paneled on the inside. All door bars above eight (8) inches must be visible from inside car. The floor must be sealed to the bottom of the door on both sides of the car. The rear seat area must seal to the rear firewall.
E. Door bars may not be covered on the interior of the car and must be visible for inspection from the inside of the car.

20G- 3.5 DOORS-
A. Doors may be steel or aluminum. External nerf bars, made of a maximum1” round tubing may be used. The nerf bars must be located between the front and rear wheel only, be spindle height, must fit tight to the body panels, and must be painted the same color as the body panels that its attached to. The ends of the nerf bars must be turned into and go through the body or be bolted at the end of the bar with a flush bolt that goes through the body to an interior bar of the same length as the outside bar to prevent hooking. The outside bar must have the ends rounded. Spreading or narrowing of the body is not permitted. Doors must have OEM Stock contour.
B. Cars must have a magnet steel anti-intrusion plate minimum 0.090 inch thick, installed on the outboard side of the left side door bars. (See NASCAR rule book 20F-3.5-B for mounting instructions & diagram).

20G- 3.6 FENDERS- Front fenders and rear quarter panels may be steel, aluminum, plastic or approved composite.

20G- 3.7 GRILLES- Grill openings must remain stock for year/make/model.

20G- 3.8 HOODS, ROOF-
A. Hoods may be made of steel, aluminum, fiberglass or approved composite. The sides of the hood must seal tight to the fenders. The back of the hood (including the raised area of the scoop) must fit tight to the windshield. The hood must be in place at all times.
B. Hood must be held closed with quick release pins across the front. Quick release pins or hinges may be used across the rear.
C. Holes in the hood or any functioning air scoops are not permitted. Hoods must lay flat.
D. No openings or cut-outs are permitted in the hood.
E. All roofs must be the same size and shape of a production roof. Steel or fiberglass roof permitted. Roof panels must be permanently mounted in the stock position the same as a stock production roof for the year/make/model being used.

20G- 3.9 REAR DECK LIDS/TRUNKS- The rear deck lid / trunk may be steel or aluminum. Fiberglass is not allowed. The rear deck lid must maintain the same dimensions, angles and bodylines as the stock production car. Lid may be held closed with quick release pins and/or hinges. Complete taillight panel and bumper cover must be run.

20G- 3.10 BUMPERS/BUMPER COVERS- The bumper & bumper cover must be acceptable to SMS Officials and meet the following requirements:
A. The front and rear bumpers and/or bumper covers must be installed in the same location as far as height, width and depth as a stock factory production bumper.
B. Magnetic steel tubing must be used to reinforce the front and rear bumper covers. The tubing that is used for the main structure of the bumper must not be exposed and must remain behind the bumper covers.
C. The front and rear bumpers/bumper covers must be solid. Holes are not permitted.
D. All front and rear bumper covers should be painted the same color as the car including bolts and rivets.

MANDATORY REAR BARS- To help create a better alignment of all “front bumper -to-rear bumper” contact, two bars made of 1 ¼” OD round magnetic steel tubing must be added to the fuel saver bar, and connect to the bottom of the main rear bumper bar. These two bars may have one 90 degree bend in them, and may be bolted or welded in place. These are the only bars that will be exposed from the bumper cover.

20G- 3.11 IDENTIFICATION–
A. Numbers / Graphics- All car number configuration and design is subject to approval by SMS Officials. Single or double-digit numbers are permitted. The size, color, and style of numbers must be adequate to permit prompt identification by SMS Officials at all times. Numbers must be solid, at least 18 inches high, measured vertically, excluding borders and silhouettes, must be neatly attached to or painted on both sides of the car on the center of the door. Door numbers must be a minimum of four (4) inches in width, and slant no more than 30 degrees from vertical. The tops and bottoms of all numbers must be even (not staggered). Two (2) digit numbers must have a minimum separation of two (2) inches between the numbers including borders. All graphics must have a minimum separation of two (2) inches from any number including borders. A solid number 24 inches high, excluding borders and silhouettes, must be neatly attached to or painted on the roof, reading from the driver’s side. Solid numbers, as large as possible, must be attached to or painted on the uppermost corner of the right side windshield and the right rear taillight cover. The use of number decals is acceptable if SMS Officials determine that the number is legible. Mirror foil numbers and decals are not permitted. Paint schemes using a mirrored or holographic appearance are not permitted. All car numbers are owned by and will be assigned by SMS Officials for use by the car owner. Car numbers are not transferable or assignable by the car owner.
B. Decals and Advertising- SMS may refuse, restrict, or assign the size or placement of decals, identification, and advertising of any kind on a car for any reason. SMS may refuse to permit a Competitor to participate in an Event if we determine that any advertising, sponsorship or similar agreement to which the Competitor (or a car owner, driver or crew member associated with the Competitor) is or will be a party, is detrimental to the sport, to NASCAR, Series Sponsor, or to the Promoter for any reason, including without limitation, the public image of the sport. Decals, advertising logos, text or identification of sponsors are not permitted on the most rearward vertical portion of the rear bumper cover. Decals, advertising logos, text or identification of sponsors are not permitted forward of the hood pins on the front of the car. Decals, advertising logos, text or identification of sponsors must not be on the roof panel unless otherwise authorized by SMS Officials. Decals, advertising logos, text or identification of sponsors must not extend past the seam between the hood and front fenders.

20G- 3.12.1 BODY TEMPLATES- Templates may be used. The decision of SMS Officials is final. All vertical body measurements are measured at cars race ready ride height.

20E- 4 GENERAL ENGINE REQUIREMENTS- The only approved engine for GM is the CHEVROLET 350. Engine block must be OEM cast iron V8 production block new casting #1006603, old casting # s (3970010, 3970014, 14010207 ,14010209, 14011064, and 14016379), or the DART SHP. The maximum decking of the block is 9.00”. Angle milling of block deck is not permitted. Offset dowel pins are not permitted. De-flashing, grinding, welding or painting of any internal area is not permitted. Maximum overbore is .065″. A maximum static compression ratio of 10.5 to 1 is permitted.

These SMS Spec Engine rules are intended to create a standardized rule package to reduce cost and increase the level of competition. With the exception of engine machined components, all Spec Engine listed parts and components must be used as purchased, with no modifications permitted, unless otherwise noted.

20E- 5 DETAILED ENGINE REQUIREMENTS- All parts for the Spec Engine must maintain manufacturers overall dimensions and weight. All Spec Engine parts must be installed as supplied, with no machining or modification except where noted. We will add a list of Spec Engine component part numbers.
Approved part numbers are as follows:
GM BLOCK – 10066034, 3970010, 3970014, 14010207, 14010209, 14011064, or 14016379 , or the DART SHP.
PISTONS- Wiseco Pro Tru-PT003H, JE SPR-157076, Manley-59053 Minimum ring thickness permitted is: Compression rings 1/16”, Oil ring assembly 3/16”
RODS- Manley-14104-8, 14050R-8, or Crower Sports Rods- SP3205
OIL PAN – Moroso-123412 or Canton-11-122
VALVES- Manley Intake 11596 or 11864, Manley Exhaust 11543 or 11863
CRANK- Scat Cast or Steel – 9-350-3480-5700, Callies Magnum Series, or Manley 190190.
INTAKE- second generation Edelbrock 2101
HARMONIC BALANCER- ATI 917260 or 917320 or BHJ CH-IBS-6-C
CARB SPACER- Big Haus U.S.A. # 001
FLYWHEEL- 10,000 RPM- 1019 (12.5 lbs), RAM- 1510, Flywheel must maintain a minimum weight of 12 lbs (bolts not included).

20E- 5.1 ENGINE LOCATION-
A. Engine must be in the OEM Stock location for a V8 in your year/make/model chassis. OEM Stock engine location is: The engine must be centered from left-to-right in the chassis, and the distance between centerlines of the forward most fuel pump bolt hole to the upper idler-arm mounting bolt hole must measure 8.75” inches +/- .25” inch. All bolt holes/locations must be OEM Stock.
B. The crankshaft centerline (vertical dimension) to ground may be a minimum of 12-3/4”, measured at the center of the harmonic balancer when car is at 5” ride height / blocks.

20E- 5.5 PISTONS/RODS- Wiseco Pro Tru -PT003H, JE SPR- 157076, or Manley-59053 piston must be used. Manley-14104-8 or 14050R-8, or the Crower Sport Rod- SP3205 must be used.
A. The approved piston must retain all its manufactured dimensions and weight. The JE and Manley pistons must maintain a 2.50” pin length. Wiseco pistons must maintain a 3.00” pin length. Gas porting of any type is not permitted. All rings must be installed, working and of magnetic steel. Stainless, z-gap, gapless, or Dykes type rings are not permitted. No portion of piston may protrude above the top of the block. The minimum ring thickness permitted is as follows: Compression rings 1/16″ Oil ring assembly 3/16″.
B. Only magnetic steel non-coated piston pins maintaining a minimum diameter of .927” inch are permitted. They must be contained by bushings only (no bearings of any type). Full floating pins are permitted. Wrist pins may not be coated.
C. Piston pin holes must be in a fixed location in the piston and connecting rods.
D. Only two-piece insert style connecting rod bearings are permitted.
E. The approved rod must retain all of its manufactured dimensions and weight. Only normal engine balancing and the use of after-market bolts and nuts are permitted. No de-burring, de-flashing, polishing, grinding or lightening is permitted. Rod length must be 5.700”.
G. Minimum weight for piston, pin, ring, bearing and rod assembly is 1185 grams.

20E-5.5.4 OIL PAN- Moroso 12312 or Canton 11-122 pan must be used. Pump must be stock steel type in-the-pan only. No external components permitted except for standard oil cooler. An inspection plug, installed per SMS Officials, is mandatory.

20E-5.6.2 HEADS- Dart part number 10024266 cylinder head casting must be used. The casting part number must be purchased as completely produced by Dart, custom ordering of partial production/finishing is not permitted. The Dart casting is produced with, and must maintain a 62cc combustion chamber, a 2.02” intake valve and a 1.60” exhaust valve. Machining the valve guide bosses for seals and machining the gasket surfaces is permitted. The addition of screw-in studs, guide plates, valve spring seats, valve seals, poly-locks or jam-nuts is permitted. Coolant lines are permitted on the front/rear ends of the heads. Coolant lines are not permitted on the side of the head. Max Intake port volume is 177cc. Max Exhaust port volume is 71cc. The Intake to pin measurement must be no less than 6.050”. The ports/runners, combustion chamber, area under the valve seat, the valve angle and location must remain as produced by Dart, with no modifications of any type permitted. The EGR port may be blocked off at the intake gasket area only, by use of a metal shim on one surface of the gasket. The exterior of the casting may be painted. A maximum of 2 intake mounting holes may have HeliCoils. Intake and exhaust mounting holes may not be added or relocated. Holes must take standard dimension bolts. No other machining or modifications of any kind are permitted.

VALVES- The Manley intake valve 11596 (111 grams), Manley intake valve 11864 (114 grams), Manley exhaust valve 11543 (95 grams) or Manley exhaust valve 11863 (102 grams) must be used. Valve stems must have a minimum diameter of 11/32 inch. Valve lifter weight is 85 grams minimum. All parts must maintain production dimensions and weight.

VALVE JOB- When cutting the valve seat angles, no stone or grinding marks are permitted above the bottom of the valve guide. All cutting in reference to the valve job must be centered off the centerline of the valve guide. Competition style multi-angle valve job is permitted. The bowl area must pass the 360 degree “ball” check (the appropriate sized ball must not fall into the guide area when rolling around on the valve stem). Intake is a .787” ball. Exhaust is a .531” ball. Surfaces and/or edges where the cutter or stone has touched must not be polished. No hand grinding or polishing is permitted on any part of the head.

VALVE SPRINGS & RETAINERS- OEM Stock type magnetic steel retainers that weigh a minimum of 30 grams (retainer only) must be used. Valve springs may be single or double springs, but must be parallel wound. Barrel wound, conical wound springs, or beehive type springs are not permitted. Double springs must have a diameter between 1.450” and 1.437”. Valve springs must have a height of 1.700” to 1.800”. Retainer locks must be magnetic steel, and must be Machine 7 degree, Super 7 degree, or 10-degree types only.

20E- 5.7 CRANKSHAFT-
A. The Scat Cast or Steel Crank 9-350-3480-5700, Callies Comp Star series crankshaft, or the Manley 190190 may be used. The main and rod journal sizes are .020” under for the main and .030” under for the rod journals. Stroke must be 3.480”.
B. Small journal or Honda pin crankshafts are not permitted.
C. Machining or polishing of the crankshaft counterweights is not permitted. Normal standard engine balancing is the only acceptable modification that can be performed on this component. No painting or Teflon coating. No capping of the counterweight holes. Crankshafts must maintain the manufacturers’ dimensions.
D. Minimum crankshaft weight is 46lbs.
E. The Power Bond PB1012-ss, ATI 917260, 917320, or the BHJ CH-IBS-6-C harmonic balancer must be used.

20E-5.8.1 CAMSHAFT- K15 or P55 cast core camshafts must be used (Billet steel cores are not permitted). The maximum camshaft bearing journal size is 1.875″ (475mm). Camshaft may not exceed .550” lift at the valve with zero lash.

20E – 5.8.2 VALVE LIFTERS-
A. A .842” diameter magnetic solid steel valve lifter must be used. Roller tappets, ceramic valve lifters, tool steel solid lifters, mushroom valve lifters, and any type of mechanical assistance exerting a force to assist in closing the valve and/or push rod commonly known as rev-kits are not permitted.
B. Valve lifters can weigh no less than 85 grams.

20E- 5.8.3 ROCKER ARMS- Aluminum or stainless stud mounted roller rocker arms are permitted. 7/16” studs may be used. Steel 5/16” x .080” wall push rods must be used. Chevrolet must run 1.5 ratio rockers. Stud-girdles or aftermarket shaft rocker systems are not permitted.

20E- 5.9 INTAKE MANIFOLD– A second generation Edelbrock 2101 intake manifold must be used. This intake must contain the made in the USA stamp. There are no modifications or alterations permitted to the intake manifold. No porting, polishing, acid dipping, deburring, de-flashing, abrasive cleaning, internal painting, milling, cutting, drilling holes, enlarging bolt holes, matching of ports or welding. An SMS supplied intake manifold must fit your engine complete with stock gaskets. All bolt holes must be in alignment and same size as stock. Coolant lines are only approved from the water neck to the back side of heads. The maximum thickness allowed for the Intake gasket is .064”.

Note: SMS Officials reserve the right to swap competitors intake manifolds as part of their routine post-race tech process.

20G- 5.10 CARBURETOR – Holley two-barrel model 4412 carburetor must be used. All parts must be a Holley manufactured part for the 4412 model. Polishing, grinding, resizing or reshaping of any part or orifice is not permitted. The body, base plate, metering block, and bowl must be a standard Holley 4412 part, HP parts are not permitted. OEM type gaskets, jets and power valve must be used. The diameter of every hole in carburetor must pass the standard NASCAR /SMS pin and tooling gauges as part of our routine tech process.
(1) Body of carburetor and metering block: No polishing, grinding or reshaping of any part. Drilling of additional holes or plugging holes is not permitted.
(2) The choke may be removed, but all screw holes must be permanently sealed.
(3) Choke Horn: Choke horn may not be removed.
(4) Boosters: Boosters may not be changed. Size or shape must not be altered. Height must remain standard.
(5) Venturi: Venturi area must not be altered in any manner. Casting ring must not be removed.
(6) Alterations to allow additional air to be picked up below the opening of the venturi such as altered gaskets, base plates and drilling holes into the carburetor will not be permitted.
(7) Base Plate: Base plate must not be altered in shape or size.
(8) Butterflies: The stock Holley 4412 or Stainless Steel Holly part 346 butterflies must be used. They may not be thinned or tapered. The Butterflies must remain as manufactured, and must maintain the Holley production tolerance thickness of .0438” to .0398”.  Idle holes may be drilled in butterflies. Screw ends may be cut even with shaft but screw heads must remain standard.
(9) Throttle Shaft: Shaft must remain standard and must not be thinned or cut in any manner.

20E- 5.10.2 CARBURETOR SPACER –The Big Haus U.S.A. spacer 001 must be used. Modifications of any type are not permitted to the spacer.
One standard gasket per side, maximum gasket thickness of .075” permitted.
Additional openings for the induction of air are not permitted. All spacers must be approved by SMS Officials.

20G- 5.12.1 AIR FILTER / AIR FILTER HOUSING-
A. Only a round dry type paper air filter element with a diameter of 14” and a height of 3” must be used. All air must be filtered through the element.
B. The ALLSTAR Performance 25900, the AFCO 80550, or an exact equivalent air filter housing assembly must be used. This is a 3 piece assembly, the top, the base, and the sealing ring. Modifications to any part of the air filter housing assembly is not permitted.
A shield may be installed to the front area of the air filter housing up to a maximum of one half of the air filter circumference. The shield must not be higher than the height of the air filter element. Any type of air induction, ducts, baffles, tubes, funnels or anything else which may control the air entering inside of, or between the air filter and carburetor is not permitted.
C. The AllStar or AFCO supplied ½” sealing adapter must be used between the carb flange and the air cleaner base.
D. No part of the air filter or air filter housing may protrude through the hood. The hood must lay flat and be fitted tight against the base of the windshield.
You may not compete without the air filter and air filter housing in place.

RECOMMENDED ENGINE BUILDER LIST

R.A.D. AUTO MACHINE 80 RAVENWOOD DR. LUDLOW, MA 01056	Don Wood 413-583-4414
T/A ENGINES 124 HILL TOP ROAD PLANVILLE, CT 06062	Tony Alteri 860-747-6713
PERFORMANCE ENGINES 79 HAYES STREET TORRINGTON, CT 06790	Billy Mathes 860-489-0363
PETTIT RACING ENGINES 44 OLD STATE ROAD UNIT 38 NEW MILFORD, CT 06776	Mike Pettit 860-354-3339
LARRY’S AUTO MACHINE AIRPORT IND. PARK GROTON, CT 06340	Gary Espinosa 860-449-9112
CARLQUIST COMPETITION ENGINES 98 FALLS AVE. OAKVILLE, CT 06779	Bill Carlquist 860-247-0742
EAST COAST MACHINE 59 OLD BROADWAY NORTH HAVEN, CT 06473	Peter Chillemi 203-996-8767 eastcoastmachine@yahoo.com
AUTOMACHINE LLC. 55 NEWBERRY ROAD EAST WINDSOR, CT 06088	Dave Miller 860-627-9244
ANDY’S AUTO MACHINE 48 LEWIS STREET PLAINVILLE, CT  06062	Andy Krawiec 860-793-2455 andrewkrawiec@snet.net
SPECIALTY PERFORMANCE ENGINES 160 OLIVER ROAD LEBANON, CT 06249	Brian Kowalshyn 860-917-3436 specialtyperformanceengines@hotmail.com

20G- 6.1 IGNITION SYSTEM – Electronic distributors are permitted. All electronic distributors must be in stock type housings, have stock type controls and modules, be equipped with a magnetic pickup, be gear driven, and be mounted in the stock location. Billet distributor housings are permitted.
B. Single or dual point camshaft driven distributors are permitted.
C. Only one (1) ignition coil is permitted and must be mounted on engine side of the firewall.
D. Electronic firing module amplifier box is not permitted.
E. Computerized, multi-coil, dual electronic firing module box or crank trigger systems are not permitted. Magnetos are not permitted. All ignition systems are subject to approval by SMS Officials.
F. Adjustable timing controls are not permitted.
G. Retard or ignition delay devices will not be permitted.
H. Only the MSD #8727CT or the MSD #8728 External RPM limiter may be used. The violet wire of the MSD # 8728 must be cut back flush to the unit’s housing. The green and the white wires of the MSD # 8728 must run directly to the coil negative. The MSD # 8728 must be mounted out of reach of driver.
I. Accessories to regulate the power supply are not permitted.
J. The tachometer wire must run from the distributor to the tachometer along the #8 dash bar separate from any other wires and in unobstructed view for inspection. The tachometer wire must be isolated from any other wires, connections or devices. The entire length of the tachometer wire must be visible from distributor to the gauge.
K. The Vacuum advance unit may be replaced with a manual non-electronic timing adjuster that does not extend more than two inches beyond the distributor housing.
L. GM firing order must be 1-8-4-3-6-5-7-2.
M. The manufactures cylinder identification sequence is as follows: G/M Front 5-1 6-2 7-3 8-4

20G- 6.2 STARTER – Stock type starter only. Must be in stock position and operate at all times.

20G- 6.5 BATTERY – One (1) 12-volt Gel or Glass Mat type battery with a minimum weight of 17 lbs is mandatory. The battery must be located in an enclosed battery box, complete with a cover behind the front spindle but no further back than to have the front surface of the battery flush with the firewall or in front of the rear axle housing behind the rear firewall. The battery must be completely closed / sealed off on the drivers side of the firewall. The battery box must be mounted inside the outside edge of the frame rails and must not extend below the bottom of the frame rail. Any battery that would be installed during the race must be installed in the battery box. Accessories to regulate the power supply will not be permitted.

20G- 6.7 ACCESSORIES – No onboard computers, automated electronics, recording devises or digital readout gauges of any kind are permitted.

20G- 6.7.1 RADIOS
A. The in-vehicle radio must be analog only and must not be capable of transmitting or receiving in a digitized, encrypted or scrambled format as determined by NASCAR. Keypad style and/or password protected radios will not be permitted. Scanning and/or channel hopping transmissions to or from the in-vehicle radio will not be permitted. All transmissions to and from the in-vehicle radio must be in the 450.000MHz-470.000MHz UHF range. The in-vehicle radio is not permitted to transmit or receive any type of telemetry (data) signal or information other than audio communications and must remain independent from any electronic system in the vehicle. Teams will not be permitted to rebroadcast transmissions to or from the in-vehicle radio at any time during an Event. It is strongly recommended that all in-vehicle radio frequencies be licensed for use by the Federal Communications Commission (FCC) and meet all applicable regulations and guidelines.
B. Only one (1) NASCAR-approved, two-way radio and one (1) radio push to talk button will be permitted. It is not permitted to have any frequency of any Competitor installed in the radio at any time. The vehicle is permitted only one (1), approved radio wiring harness.
D. At all times during practice(s), qualifying and the Race the spotter must have radio communications with the driver and must monitor the NASCAR frequency. Spotters must be in the designated spotter location at all times during competition. The radio frequency being used will be made available by NASCAR Officials.
E. Driver to driver radio communications will not be permitted.

Waddell Communications – www.waddellcommunications.com  860-573-8821

20G- 6.7.2 SPOTTERS – Spotters are mandatory. Every car must have a spotter monitoring SMS race control by way of scanner or radio, located in front of SMS Race Control tower with radio communication to their car. Cars that do not follow directives from Race Control via their spotter may be black flagged and removed from the event.

Waddell Communications – www.waddellcommunications.com  860-573-8821

20G- 6.7.3 TRANSPONDERS – Transponder are required on the cars at all times. See the SMS General Rules for locating transponders properly. Any car not registering a transponder signal during practice may be black-flagged to be made aware of their scoring transponders failure and is required to remedy it before proceeding further in the event.

MYLAPS AMERICA
www.mylaps.com
32 Highlands Parkway Suite 104
Smyrna, GA 30082
Tel 678-816-4000

20G- 7 ENGINE COOLING SYSTEM – Only Water or SMS approved coolants or additives may be used in the cooling systems. Ethelyne Glycol or Propolyne Glycol coolants are not permitted. 

20G- 7.1 WATER PUMP
A. A stock OEM type pump must be used. Electric pumps are not permitted.
D. Any serpentine, cog or V-belt pulley system is permitted.

20G- 7.2 FAN – Stock OEM type mechanical or electric fans are permitted.

20G- 7.4 RADIATOR
A. An OEM stock type radiator must be used in the stock location.
D. All cars must be equipped with an approved overflow catch can under the hood by the right front fender. The over flow hose coming out of the catch can must run and up through a fitting in the cowl, at the base of the windshield on the right side.

20G- 8 ENGINE OIL SPECIFICATIONS – Combustion enhancing oils or additives are not permitted.

20G- 9 ENGINE EXHAUST SYSTEM
A. The Hedman 68600, Schoenfeld 185, Dynatech 01-21900, Kooks stainless steel 15055, Kooks 6250200, Flowrite FR250FF, Flowrite FR275FF, Beyea ALMCO-23NO or their exact equivalent headers must be used. Headers must be used as manufactured, they may not be modified, other than for interior and exterior coatings.
Ford engine: Headers must be a commercially manufactured part using a 1-5/8” outside diameter steel primary tube. They may be a maximum of 30” in length, with a 3” outside diameter collector pipe. Primary tubes must exit down. The header collector pipe cannot be reduced at any point between the primary tube and the exhaust pipe. No merge or pyramid style collector is permitted.
C. The exhaust header flange must mount directly to the cylinder head with no spacers between the flange and the cylinder head.
D. The header collector must be used as supplied, and may not be modified.
E. Exhaust pipes must be of 3″ dia. exhaust tubing and run from the header back to within 12” of the rear end housing, then turn down a minimum of 45 degrees. Pipes may not exit out the side of the car. Both exhaust pipes must be independent with no connection between them.
F. Mufflers: – You must use two of the following: LOBAK  RCM 30-12-30, Kooks R300-10, or Flowrite FR300. Modifications or repairs of any type are not permitted on the muffler. Both Muffler flanges must be intact. Mufflers must be removable for inspection.
G. Thermal wrap is not permitted anywhere on exhaust system.
H. Only one muffler and exhaust pipe per side of car is permitted.
I. Exhaust system subject to approval by SMS Officials.

NOTE: The life expectancy for all mufflers is two years. Each team is responsible for inspecting their mufflers to insure they are not illegal due to wear. A muffler will be deemed illegal if it is missing one or more of the internal baffles.

20G – 9.3 HEAT SHIELDS- Heat shields of any type are not permitted.

20G- 10 ENGINE DRIVE TRAIN – FLYWHEEL AND CLUTCH – Flywheel- OEM Stock dimension steel, or aftermarket replacement billet steel flywheel for engine type must be used.
Aftermarket- 10,000 RPM- 1019 (12.5 lb), RAM- 1510, Flywheel must maintain a minimum weight of 12 lbs (bolts not included).
Flat surface machining allowed only on the face of the flywheel, any cutting or machining on the back side of the flywheel is not permitted.
Pressure Plate- OEM stock type 10” steel pressure plate must be used. See weight requirement below.
Clutch Disc- OEM stock type 10” steel full 360 degree disc or Magnus part # 384152F and 384152C must be used. Drilling or lightening of any part is not permitted. Solid magnetic steel fasteners must be used.
Pressure plate & clutch disc combined minimum weight – 16 lbs. (fasteners not included).
Clutch disc minimum weight 2.5 lbs. and a maximum weight of 3.8 lbs. (fasteners not included).

20G- 10.3 BELL HOUSING – Only a commercially manufactured magnetic steel bell housing may be used. The bell housing must enclose the flywheel 360 degrees with minimum 3/16” inch magnetic steel. Any modifications you make to the bell housing must be done with 3/16” steel and welded in place (no bolt on pieces). A commercially manufactured bell housing (like the Quarter Master  008110440) with a bolt on bottom cover may be used. An opening no larger than 3- ½ x 4 inches may be used for throw out bearing access. This hole may be covered with sheet metal.

20G- 10.4 TRANSMISSION
A. Only OEM production stock 3 & 4 speed transmissions may be used. Top loader transmissions are not permitted. Gear ratio must be of stock OEM production.
B. Only cast iron housings are permitted. Aluminum or magnesium transmission housings are not permitted.
C. Only OEM type, steel, angle cut forward gears are permitted. Square cut forward gears are not permitted.
D. The removal of first gear, or replacement of first gear with a metal spacer, in 4-speed transmissions is permitted. All other forward and reverse gears must be in working order, and they must be operational from inside the driver’s compartment. All transmissions must have a constant engagement of the input shaft with gear and countershaft with cluster gears.
E. Machining or lightening of any internal rotating or non-rotating parts including gears, shafts and case is not permitted. Gun drilled transmission shafts are not be permitted. Welding on any internal part is not permitted. External oil pumps and oil coolers are not permitted.
F. Additional or different from OEM bearings other than the tail-shaft, which may have roller bearings, are not permitted.
G. Auxiliary, over or under drive transmissions are not permitted. High gear must have a ratio of 1 to 1 and no other gear may have a ratio higher than 1.20 to 1.
H. Only fire resistant type shifter boots, secured with fasteners, acceptable to SMS Officials is permitted. The shifter boots should must meet the SFI 48.1 specification and display a valid SFI 48.1 label visible on the outside surface of the shifter boot. Quick release fasteners should not be used to secure the shifter boot. The shifter boot, when installed, should be completely sealed to the floor of the car. Installation of the shifter boot must be acceptable to SMS Officials. Shifter boots should not be used beyond three (3) years from the date of manufacture.
I. Heating pads, blankets or any other heating devices are not permitted at any time.
J. Transmission vent/breather hose & filter assemblies must be located within the transmission tunnel and must not extend forward of the vertical front firewall. Remote transmission reservoirs and/or fill tubes are permitted. All transmissions must contain a minimum of one (1) quart of lubricant. The shifter and all of its components must be made of steel or aluminum.

20G- 10.5 DRIVESHAFT
A. Drive shaft, universal joints, and yoke must be magnetic steel and be similar in design to the standard production type. The drive shaft must be made of one-piece magnetic steel and must either 2-3/4 inches or 3 inches in diameter.
B. Two (2) 360 degree solid magnetic steel brackets with no holes or slots, not less than 2 two (2) inches wide and ¼ inch thick, must be placed around the drive shaft. The front bracket must be welded to the rear suspension crossmember and the rear bracket must be welded or bolted, with a minimum of two 3/8-inch diameter bolts on each side, to the horizontal tunnel bar (#6).
C. All drive shafts must be painted white.

20G- 10.6 REAR AXLE – The rear axle must meet the following requirements: Rears may be changed between different makes and models.
A. The center of the rear end housing must be within 1″ of the centerline of the track width, front and rear.
B. Differential gears must be welded or replaced with a steel spool. Posi-traction, limited-slip or ratchet type differentials are not permitted.
C. Only one-piece, magnetic steel rear end axle housings are permitted.
D. Racing axles are mandatory on both sides for all GM rears. Full floating straight-cut double splined rear axles may be used. Only one-piece solid magnetic steel axles are permitted. Hollow or drilled axles are not permitted. Full floating double splined rear axle minimum weight is 9.0 lbs.
E. Magnetic steel axles, drive plates, bearings, and axle housings are allowed. Aluminum parts are not permitted in or on the rear housing assembly (except for the axle caps and brackets for third link).
F. Cambered rear axle housings or other cambered components (axles, drive flanges, etc.) will not be permitted. Crown type axles or spline adapters will not be permitted. A tolerance of 1-1/2 degrees of camber (positive or negative) will be permitted.
G. Only magnetic steel drive plates, the same thickness on the left and right side are permitted. The drive plates must be one-piece with a single straight cut internal spline. Grease fittings are permitted on drive plates and axle caps.
H. UPPER TRAILING ARMS-A steel arm with heim joints or stock OEM type rubber bushings may be used. The upper arm must be a maximum of 13 inches from the vertical centerline of the rear axle to the centerline of the forward mounting point. Shocks, springs, or torque absorbing bushings are not permitted on upper trailing arm.
PANHARD BAR- A steel panhard bar or steel watts link with heim joints or stock OEM type rubber bushings may be used.
I. LOWER TRAILING ARMS- You must use a Stock OEM arm, DCA 17812, Johnson Chassis JCI-09-03-01M, Johnson Chassis JCI-09-03-03B, Hamm’s Welding GHC-1925 or Hamm’s Welding GHC-1950 arm. The Stock OEM, DCA, Johnson, and Hamm arms may not be modified or altered, except the Stock OEM trailing arms may be plated for added strength, which will make them equal to the DCA replacements. Lower trailing arms must attach to the frame in the OEM Stock location. Mounting brackets on the axle tubes may be moved but rear must be centered in chassis. The lower trailing arm brackets may not be longer than 6”, as measured from the bottom of the axle tube to the lower end of the bracket.  Left and right brake rotors must be an equal distance from the frame rails.
ADJUSTABLE RIGHT LOWER TRAILING ARM- The RIGHT side lower trailing arm may be the Johnson Chassis “GM Metric” adjustable arm or the Hamm GHC-1937J adjustable arm. The adjustable arm must be installed at a length of 19-1/4” +/- 1”. The Hamm adjustable arm may not be modified or altered.
J. Springs must be mounted on axle housing in stock location for frame being used.

20G- 10.6.1 REAR