BODY: 1970 or newer American compact passenger car only. Stock appearing front window support units must be used. A minimum window opening of twelve (12) inches must be maintained on all four window openings (front, back, left and right). Streamlining at top of windshield is not allowed. Bodies must have standard appearing windshield opening and corner posts must follow standard configuration. Bodies with excessive damage (as determined by an official) will not be allowed to compete.

Spoilers & Decking: Rear spoiler is permitted, but not mandatory. May be a maximum five (5) inches tall and sixty-seven (67) inches wide. Maximum of three (3) spoiler braces are permitted, but must be mounted in line. Must be mounted within confines of spoiler braces. Fins, lips and/or wings are not allowed. The rear deck lid and/or trunk area must be covered. Deck height may be a maximum of forty-one (41) inches—NO TOLERANCE. Drop decks are not allowed. Deck must remain parallel to the frame and level from side to side. Deck may have a maximum total slope of six (6) inches with a maximum of three (3) inches of slope from racing seat to rear of deck. Doors and quarter panels must be flush with the deck. Deck width may be a maximum of sixty-seven (67) inches and must be the same from front to rear. Excluding hood and nose piece, the bottom of body may extend a maximum of 6 inches further forward than the back of the engine block. Engine covers are not allowed. Maximum 5-inch plastic skirting allowed on the bottom of the doors and quarter panels and nose piece is permitted. Body must remain a minimum of three (3) inches from ground. Maximum overall width of nose is forty-two (42) inches top and bottom. Two and one half (2.5) inch nose fins are permitted along both sides of the nose. Nose fins may not pass the leading edge of the radiator or continue past the leading edge of the hood. All aluminum of the nose (including the fins) must be completely inside the outer edges of the bumper. Nose fins must match side to side. If it is between nose fins, it is the nose; if it separates from the hood, it is the nose.

Bumpers: Center of bumpers (front and rear) must be at least sixteen (16) inches from the ground and no more than twenty-three (23) inches from ground. Both front and rear bumpers must be used, and must not have any sharp edges. Any inappropriate bumper will be disallowed by an official. Tires must be the widest part of the body. Rear bumpers may be constructed of tubing or flat stock, and must protect the fuel cell.

Appearance: All racecars must be numbered with large legible numbers on both sides, on top and on the nose and rear panels. Numbers on the sides of the racecar should be in contrasting color from the body and be at least four (4) inches thick and at least eighteen (18) inches high. Top numbers should be at least four (4) inches thick and twenty-four (24) inches high.

ROLL CAGES: Round steel tubing, seamless roll-over bars are required for the basic roll cage, and must be acceptable to officials. Acceptable tubing is as follows: minimum one and five-hundred thousandths (1.5) by ninety-five one thousandths (.095) of an inch for mild steel and DOM tubing. Bar connections must be properly welded. Roll bars within the driver’s reach must be padded with an accepted material as determined by an official. Fire retardant material is highly recommended. Installation and workmanship must be acceptable to officials. Must be frame-mounted in at least six (6) places. Must consist of a configuration of front and rear hoops connected by tubing on the sides or side hoops. With helmet on and driver securely strapped into the racing seat, top of driver’s head must not protrude above the roll cage or out the side of the roll bars. Must have a protective screen or bars in the front window opening in front of the driver's face. Protection of driver’s feet utilizing a bar across the back of the engine with vertical bars and rub rails or similar protection is mandatory. Brace bars forward of the roll cage may not be higher than the stock hood height. A minimum of three (3) driver side door bars must be parallel to ground and located perpendicular to the driver so as to provide maximum protection for the driver, but without causing undue difficulty in getting in or out of the racecar. Side bars must be welded to the front and the rear of the roll cage members. Door bars and uprights should be part of at least one and one-half (1.5) inches in diameter at a minimum of eighty-three one-thousandths (0.083) of an inch thickness and be gusseted in place. The door bars must have four (4) vertical studs per side equally spaced.

FRAME: 1978-1987 unaltered OEM mid-size GM metric full frame only. Wheelbase must be a minimum one hundred seven (107) inches and maximum one hundred nine (109) inches on both sides. All frame bolt holes must remain in OEM location. Front frame horns may be removed in front of the steering box. Front frame may be cut for radiator clearance only. Transmission cross member mounts may be removed, but no further forward than frame welds. Rear of frame behind upper shock mounts may be replaced with round, square or rectangular tubing. Except for the front cross member, no part of the frame can be lower than five (5) inches from ground. Any other frame alterations are not allowed. Tubular front clips are not allowed. Hydraulic, ratchet or electric weight jacks are not allowed anywhere on the racecar. Aluminum jack bolts are not allowed.

COCKPIT: STEERING & SEAT Loose objects and/or weights are not allowed. Air bags are not allowed. Rear view mirrors are not allowed. Floor and firewall must be complete in the driver’s compartment. Interior sheet metal cannot be higher than or enclose a standard window opening. Sheet metal in the driver’s compartment must be horizontal from the top of the driver shaft tunnel to the right-side door bars or angle from the top of the drive shaft tunnel upwards to the top of the right-side door bars. Drivers must be able to exit the racecar from both sides. Steering: Must be OEM and remain within the original bolt pattern for the type of frame used. Steel tube tie rod adjusting sleeves allowed. Rack and pinion are not allowed. May be modified to suit the driver, but must remain on the left side of the cockpit (no center steering). Quick-release metal coupling on the steering wheel is mandatory. Plastic couplings are not allowed. Seat: Factory-manufactured racing seats are mandatory and must be acceptable to officials. Homemade aluminum, plastic or fiberglass seats are not allowed. Must be properly installed and the seat back cannot be moved back further than the rear edge of the quarter post. High-back aluminum seats only. Full containment racing seats are strongly recommended.

SUSPENSION: Front suspension must remain stock-type for the type of frame being used. Steel aftermarket parts may be used as stock components but must mount in the stock location and must be the same size as the OEM parts. OEM upper A-frame mount may be moved or replaced with aftermarket steel non-adjustable mount matching upper A-frame bolt-on design. Bottom A-frames may not be altered, lightened or moved. Screw-in ball joints are not allowed. Upper shock mount may be a maximum four (4) inches above the frame. Aluminum and/or titanium components are not allowed. Magnets must stick to all components. Exception: aluminum cross shafts are permitted. Steel tube-type upper A-frames are permitted and may be moved. Stock passenger car spindles only, must match the frame. Fabricated spindles are not allowed No suspension stops of any kind allowed. Rear Suspension: Control arms and mounts must be made of steel, unaltered OEM, in OEM location and match frame. Jack bolts are not allowed. Adjustable spring buckets are permitted. Must remain in OEM location if dropped. If the upper spring cup uses all thread, it must be securely welded to the chassis. Lower spring cups must be centered on housing. Control arms may be reinforced, but cannot be shortened or lengthened. Must remain OEM length. Control arm bushings may be aftermarket, but offset or bearing type are not allowed. Bushings may not be drilled. Suspension parts may not be altered or lightened. Aluminum parts are not allowed, other than bushings. Safety/tether chains must be mounted solid to the rear-end (not to suspension parts) and cannot limit travel. Shocks & Springs: One non-adjustable shock per wheel and mounted in OEM location. Air shocks are not allowed. Aluminum shocks are not allowed. Shock covers are allowed but must be mounted directly to shock. All coil springs must be at least five and one half (5.5) in front and four and one-half (4.5) inches rear outside diameter. Front springs must be a minimum of nine inches of free height. Rear springs must be a maximum 16 inches of free height. Steel springs only. Stacked and/or welded springs are not allowed. Torsion bars are not allowed in the rear. Coil over shocks is not allowed on front or rear. Steel shock mounting bolts only. Aluminum and/or titanium is not allowed. Shocks shall be subject to claim at $150 per shock and trade. Canister and/or adjustable shocks are not allowed. Bladder-type valves and/or Schrader valves are not allowed. Shock spacers are permitted. Bump stops (internal or external) are not allowed.

ELECTRICAL SYSTEM: Battery must be securely mounted inside frame rails and covered. One (1) 12-volt battery only (no 16-volt batteries). Voltage converters are not allowed. All battery posts must be securely covered. Ignition, must utilize OEM distributor and ignition. Stock appearing coils, coil covers and modules only. Multiple spark ignitions are not allowed. All ignition parts must remain out of the reach of the driver. Kill switch required within easy reach of the driver. The switch must be clearly marked “OFF” and “ON”. Crank trigger ignitions are not allowed. GM must utilize an OEM GM distributor. Chrysler and Ford may use aftermarket HEI (bushing type only). Roller bearings are not allowed. Must utilize stock-type components. Any module that fits inside the distributor with no modifications is allowed. Digital gauges are not allowed. Wiring elements must be accessible for technical inspection.

FUEL SYSTEM: Automotive gasoline and racing gasoline is allowed. Additives of any kind are not allowed. Penalty for illegal fuel is loss of points, cash and awards earned for that event. May not be blended with ethers or other oxygenates, and may not be blended with aniline or its derivatives, nitro compounds or other nitro containing compounds. Oxygenated fuel is not allowed. Upper cylinder lubricants are not allowed. Electric fuel pumps are not allowed. Belt driven fuel pumps are not allowed. Pumps must bolt to block in stock location. Carburetor, must be naturally aspirated. Fuel injection is not allowed. Aerosol carburetors are not allowed. Standard Engine must use approved naturally aspirated, unaltered 500 c.f.m. Holley – part no. 0-4412, 0-4412SA (aluminum casting no. L6R199B), both may be modified to Holley HP Dorton part no. 0-80583- 1 specs only. Float bowl must face forward. Any adapter, maximum one inch thick. No throttle bore adjustable carburetor spacers. A one (1) inch adapter plate or spacer is permitted. Distance between the bottom of the carburetor and top of the intake manifold cannot exceed one and one-quarter (1.25) inches. Spacer thickness must remain the same front to back and side to side. Fuel Cell: Must be commercially manufactured and must be mounted utilizing at least two (2) steel straps. Straps must be two (2) inches wide at all measuring points. Must be enclosed in a steel container and must be protected in rear of axle by roll cage tubing mounted securely. No part may be lower than protective tubing. Protective tubing must be no wider than six (6) inches on both sides. Fuel cell may be no lower than ten (10) inches from the ground. Must have check valves. A ball-type, flapper or spring or filler rollover valve is mandatory for fuel cells without a positive seal filler neck/cap system. Limited to a maximum capacity of thirty-two (22) gallons.

TIRES & WHEELS: Wheels must be fifteen (15) inches in diameter and eight (8) inches in width. Stickers are not required. Must be reinforced steel only. Bleeder valves are not allowed. A steel bead lock may be used on the right-side wheels only, and may be mounted on the outside of the wheel so long as it does not add over three-quarters (0.75) of an inch to the overall width of the wheel. Homemade mud caps are not allowed. Wheel covers are permitted on right side wheels only. Inner mud plugs are permitted. Wide five wheel adaptors are not allowed. Aluminum spacer between hub and wheel is permitted, but overall width of racecar cannot exceed 78 inches. Added ballast to any wheel is not allowed. Tires: Any tire allowed. MUST DUROMETER at 45 or HIGHER 15 minutes after the A MAIN Softening is not allowed. Solvents of any kind are not allowed. Altering tires with any components or chemicals which alter the manufacturer’s baseline-settings of the tire is not allowed. All sidewall markings must remain visible at all times. Buffing or removing of the compound designations is not allowed. Siping is permitted. Grooving is allowed as a track option. Added ballast to the inside of any tire is not allowed

BRAKE SYSTEM: Must be operating on all four wheels and must lock up all four wheels during inspection. Caliper and rotor must be standard size and weight. Vented rotors are required on front and rear wheels. Right front brake shut-offs are allowed. Calipers may not be lightened, must be OEM and must be made of steel. Rotors must be steel and may not be lightened, scalloped, drilled and/or slotted. Rotors may be re-drilled for different bolt patterns or larger studs. No oil bath hubs allowed. Front-to-rear brake bias is permitted. Additional inline proportioning valves are allowed but must be out of the reach of the driver. Brake floaters are not allowed Brake lines must be visible. Must maintain minimum OEM dimension for hubs, rotors and calipers.

DRIVE SHAFT: A loop is required and must be constructed of at least one-eighth (0.125) inch by two (2) inches solid steel. Loop must be mounted no more than six (6) inches from the front of the drive shaft tube. Alternatively, two (2) loops of one-eighth (0.125) inch by one (1) inch solid steel fastened to crossmember are permitted. Must be a minimum of two (2) inches in diameter. Must be painted white. Aluminum driveshafts are not allowed.

OEM cast iron three-speed only. Four-speed or five-speed transmissions are not allowed. Automatic production-types are permitted. With engine running and racecar in stationary position, driver must be able to engage racecar in gear and then move forward and then backward at time of inspection. “In and out” boxes are not allowed. Must all be clutch-operated or an OEM automatic with a ten (10) inch diameter steel functioning torque converter. Aftermarket transmissions are not allowed. Hydraulic slave cylinders or throw out bearings are permitted. Clutch must be inside of bell housing for OEM production-type transmissions. Starter must bolt to the engine block or factory location. All forward gears and one (1) reverse gear must be in working order, plus a neutral position, and must be able to be shifted by the driver. Aluminum flywheel is not allowed. Must have full-sized steel bell housing. Flywheel must bolt to the crankshaft. Clutch must bolt to flywheel, a minimum ten and one-half (10.5) inch single disc clutch allowed on GM and Chrysler and a minimum nine (9) inch clutch on Ford. Automatic transmissions must have a guard two hundred seventy (270) degrees around flex plate or flywheel, and must be constructed of at least one-eighth (0.125) inch steel. All flex plates must be SFI certified. OEM aluminum bell housing may be replaced with an explosive proof steel or aluminum bellhousing. Internal clutches are not allowed.

REAR-END: May use OEM seven and one-half (7.5) inches GM 10-bolt rear-end (bracing optional). Must remain stock width. Wide-centered fifty-eight (58) inch Ford and/or floater rear-ends are permitted with a maximum 4.10 ring and pinion gear ratio. From control arm mount out, the housing end may be modified with three (3) inches tubing to accept a nine (9) inch Ford axle. Must remain minimum GM width or maximum three (3) inches wider if Ford housing or Ford axles are used. Components must be made of steel. Lightweight gears are not allowed. Aluminum is not allowed except lowering blocks, axle cap, U-joint caps and drive plate. OEM mounts on lower control arms must remain in OEM location. Aftermarket axles, mini-spools and C-clip eliminators are permitted. Locked rear-ends only. Torque dividing differentials are not allowed. Full spools are permitted. Lightweight and/or aluminum spools are not allowed. Pinion angle may not be changed. Maximum gear ration of 4.10 is permitted, but housing must remain unaltered. Gun drilled axles are not allowed. Quick change devices are not allowed. Cambered rear-ends are not allowed (one-piece drive flange only). Traction devices are not allowed (includes Gold Track, True Track or similar type components). “Option” quick change rear-end is permitted. Rear-end must utilize steel axles and steel axle tubes only. Must use a ten (10) inch ring gear and minimum one (1) inch wide solid spur gears. Rear-end must mount like stock rear-end with stock control arms in stock location and centered in racecar. Any gear ratio is permitted. Pinion angle must remain zero (0) degrees. All other suspension, rear-end and chassis rules apply.

Engine: Any American make may be used. Exhaust & Mufflers: Any header is allowed up to 1 5/8” diameter with a 3-inch collector. Collector and turn down length may be a maximum total of nineteen (19) inches

OPTION #1 – Standard Engine: Must be stock appearing. Absolutely no changes allowed. Must use stock firing order for that make and model (GM to GM, Ford to Ford, etc.). Parts for 400 cubic inches or larger are not allowed. Stroke must match the block. Fluid dampeners are permitted. Only stock appearing crank and rods are permitted. Lightweight cranks are not allowed. Only flat top or dished pistons are permitted. Gas port pistons and/or rings are not allowed. A minimum one (1) inch plug above the oil level in the side of the oil pan is recommended. If not utilizing a plug, the oil pan will have to be removed at time of inspection. Accumulators are not allowed. External oil lines are not allowed. Only stock, unaltered two- or four-barrel cast iron intake manifolds are permitted. Approved aluminum intakes are permitted. Approved intakes are OEM unaltered two- or four-barrel Weiand 7547-1 (stamped or unstamped), Ford (7515, 8023 or 7516) or Chrysler (8022) or (7545); Edelbrock GM (2101) (2701) Ford (7121, 7181 or 7183) Chrysler (2915) or Performer 318/360 intake manifold (Part No. 2176). Porting, polishing or port machining is not allowed. Bowtie, aftermarket, SVO and W2, marine, VORTEC or other special production intake manifolds are not allowed. Ford may use OEM aluminum intakes. Under air or high-rise intakes are not allowed. Intake manifolds must be made of cast iron or cast aluminum. Cast iron stock production or unaltered aftermarket steel stock replacement heads are permitted. Porting and/or polishing is not allowed. GM cars must utilize 76cc heads. Approved aftermarket head numbers are: GM – EQ Part #CH350I; Ford – World Products Part #53030; Chrysler – EQ Part #CH138B; RHS/Indy Part #20300 or #20301. Chevy heads valve size no larger than 1.94 intake and 1.50 exhaust. Any cast iron OEM Ford and Chrysler heads permitted with valves no larger than 2.04-inch intake and 1.70-inch exhaust. VORTEC, bowtie, SVO and/or W-2 heads are not allowed. Only stock diameter valve springs are permitted. Beehive valve springs are not allowed. Roller cams and lifters are not allowed. Roller rocker arms are not allowed. Roller tip rocker arms are permitted. Altering lifter bores is not allowed. Chrysler may use OEM rocker arm bars. Must be a maximum of one hundred seventy-five (175) pounds of compression per cylinder. Compression will be checked with one spark plug removed and five engine strokes. May be a maximum of 364 cubic inches for GM, 363 cubic inches for Ford and 370 cubic inches for Chrysler. GM five and seven-tenths (5.7) inch rods only are permitted. Must be stock appearing “I” beam non- polished rod. Mushroom lifters are not allowed (stock diameter only). Must match make and model. Cap screw rods are permitted 13.6.15 Stud girdles are not allowed.

Option 2 Crate Engine: GM Performance Parts (GPP) factory-sealed CT350 Chevy small block crate engine (Part No. 88958602 or 19258602). May utilize one (1) Holley four-barrel carburetor. Use of a spacer between carburetor and intake is optional, but spacer may be no more than one (1) inch thick and may not be throttle bore adjustable. Aerosol carburetors are not permitted. MUST use unaltered MSD #8728 or #8727CT rev-control with any chip. This must be out of reach of the driver but easily accessible for inspection at all times. Any driver caught altering the chip or ignition system in any way so as to defeat the chip rule shall be disqualified. Must have “Crate” sticker on racecar or crate engine is claimable. Any driver running a “Standard” engine with a “Crate” sticker will be disqualified. Any driver running with a crate motor will not be eligible to claim in that season. Any driver that claims a standard engine and switches to crate engine will be eligible to be claimed. Must be unaltered and sealed from the factory at appropriate points (intake, head, timing chain cover and oil pan) with approved GPP break-off bolts. Any altered, damaged or missing bottle cap bolts will result in the driver being disqualified and loss of all track points accumulated, including the date of the offense.

WEIGHT: The overall weight of the racecar shall be measured at the conclusion of an event with the driver in the cockpit, wearing complete racing apparel. Overall weight of the racecar must be a minimum of two-thousand three hundred fifty (2,350) pounds. Ballast: May not be mounted in the cockpit, or outside of the body or hood area. Must be securely mounted, painted white and clearly marked with the car number. Must be attached with at least two (2) one-half (0.5) inch bolts. May not be attached to the rear bumper.