NO CHANGES FOR 2025 SEASON
 
Safety

1. Rules apply at all times car is on track. Snell-rated SA2000, SA2005, or SA2010 helmet required. Roll bar padding required in driver compartment (Fire retardant recommended). SFI-approved full fire suit required. Fire retardant gloves, shoes and neck brace (or head and neck restraint) required.
2. Right and left seat head supports required if using head restraint system with no neck collar. Recommended: Fire retardant head sock and underwear.
3. Driver-side window net required, minimum 16 inch by 20 inch ribbon or mesh style, and must be mounted to roll cage so latch is at top front of window.
4. Minimum three inch (two-inch with head restraint   system) wide SFI-approved five point safety belt assembly required (Y-type shoulder harness not allowed), must be mounted securely to roll cage,  and must be no more than three years old. Kill switch required within easy reach of driver and must  be clearly marked “OFF” and “ON”.
5. It is recommended that each racecar have built-in fire extinguishing equipment, but cannot be of the dry powder type (must be Halon 1211 or equivalent).
6. Drivers should have in their pit area as part of their equipment, at all times, a fully charged dry chemical, Halon (or its equivalent) fire extinguisher. Ten (10) or thirteen (13) pound fire extinguishers are highly recommended.
7. Absolutely no plastic except from edge of firewall to body skin and inner wheel tub to body skin or nose and tail pieces.

Frame

1. Any American OEM full body rear wheel drive passenger car 1964 or newer.
2. Minimum wheelbase of (107”) required for all cars.  Maximum 2” difference side to side permitted.
3. Full frame cars must retain front frame horns. Rear of frame behind rear tires, no further forward than one inch behind factory seam, may be replaced in OEM location with 2” x 3” inch steel tubing with minimum 0.095” inch wall thickness, same length as material removed. Factory seam must remain visible.
4. All unibody cars must have front frame and rear frame tied together. Frames may be X braced. No   station wagon, front wheel drive, or 4 wheel drives allowed. All frame crossmembers must be unaltered in stock location (exception: transmission crossmember may be altered or removed and horn may be removed from center of front crossmember). Must have a 360 degree driveshaft loop no more than 6” behind the front u-joint.  Must be minimum 0.250” x 2 “ steel or 1” tubing.
5. Rear bumpers must be OEM in OEM location and capped at ends to body with steel, welded or bolted. Front bumpers must be mounted minimum (6) inches from front frame horns. Front bumper options: 1 of 2 – Front bumper OE must be complete and capped to body with steel, bolted or welded. 2 of 2 – Fabricated front bumper with rounded corners must be OE height with   minimum 1.5” O.D. (maximum 2” O.D.) with minimum .083” (maximum 0.125”) wall thickness and must be covered with plastic nosepiece.
6. Motor must be in stock location (fuel pump must be in front of unaltered crossmember).

Roll Cage

1. Main cage must consist of continuous hoops, minimum 1.666” O.D. (1.750” recommended) with a minimum 0.095” wall thickness (low carbon or mild steel recommended). Four post main cage required and must be properly welded to frame, NOT floor pan. Poor or missing welds may be deemed unsafe by a track official and may result in disqualification.
2. A minimum 1 crossbar (minimum 1.666” O.D.) required in top halo and must be welded diagonally. Rear halo must be X braced. Front and rear down bars must be tied side to side. Top door bar must be a minimum of 36 inches inside to inside of front and rear down bars. Must be a minimum of 26 inches at bottom of top halo measured inside to inside of front and rear down bars. Must be a minimum height of 16 inches from top of door bar to bottom of halo. With helmet on and driver securely strapped in, driver’s head must not protrude above bottom of roll cage. All bars within reach  must be padded with a material accepted by track officials, flame retardant recommended.
3. Minimum of (4) 1.666” O.D. or (3) 1.750” O.D. horizontal door bars required on both driver and passenger sides (minimum 0.095” wall thickness). Horizontal door bars must be mounted perpendicular to frame and must have a minimum of (4) uprights from the  frame to top door bar.
4. Steel door plates made of 18 gage or 0.049” minimum thickness must be securely welded to outside     of driver door bars. Plate must cover from top door bar to rocker and must extend from rear down  bar to 5 inches in front of front edge of seat. Plate must be visible for inspection.
5. Rear kickers (down bars) and fuel cell protection required (minimum 0.083” wall thickness), front hoops are allowed. If front hoop is not used must have two front kickers (down bars) welded to frame no further back than front of upper a-arm.  Fuel cell protection and front kickers or hoop must be a         minimum 0.083” wall thickness and 1.250” O.D. A maximum of (2) additional bars may be added for radiator protection not counting bar tying frame horns together and must be within confines of the body. Fuel cell protection must be same height as fuel cell and extend from frame rail to frame rail         (maximum 1.750 O.D. tubing allowed) and must remain inside confines of the body.
6. All vehicles MUST have tow loop or strap mounted front and rear and must be easily accessible.

Body

1. 1964 or newer American OEM stock passenger car bodies allowed. All bodies must be unaltered (no chop tops, short bodies, etc.) and remain stock appearing. All glass, plastic, upholstery, rear seats, lights, mirrors and chrome must be removed. Interior tin or other covers not allowed. All exterior body panels must be sheet metal, no aluminum. Only door panels may be fabricated and must resemble stock appearing door. Doors must be welded or bolted secure. All sunroof and T-top openings must be covered with sheet metal. Fiberglass roof part # Shell Valley F1015-81-88MCRW will be allowed.

2 After market floor pan and fire wall can be utilize, must be at least 18 gauge. B&C Piller must remain OEM dimensions.  Stock body mounts must be visible and minimum 0.375” bolt must be able to pass through body and into body mount. No cutting of floor pan except for roll cage. All large holes in floor pan must be covered with sheet metal equal to or thicker than stock material. All holes in fire wall must be covered with   minimum 0.049” sheet metal or aluminum. Rear firewall must be covered with 0.049” aluminum or steel and must seal driver compartment from trunk area. Rear firewall must be mounted in stock location.
3. Hoods must remain stock dimensions, no custom fabricated hoods allowed. No hood scoops, spoilers, wings, or ground effects allowed. Air cleaner must not protrude through hood. Hood must be secured by a minimum of four hood pins located at all four corners. No tilt front ends, hood must be separate from fenders. Back of hood must be sealed from cockpit.
4. Nosepiece and tailpiece must be securely riveted or bolted in place. No late model nosepieces.
5. Trunk lids must be complete, no shortening allowed. Lids may be gutted. Lids must be secured at all four corners either by combination hinge/pin or pins at all four corners. May use aftermarket rear body covers.  Material between rear fenders may be removed.
6. No overlapping or shortening of body panels. Rear wheel drive 108” wheelbase bodies may be used on 112” wheelbase frames. OEM firewall for frame must be in same location as stock firewall for body used. Body   may be trimmed for wheel/tire clearance only. Front and rear fender wells may be removed.
7. Only rear opera windows may be covered.
8. Appearance:

      a) All racecars must have numbers that contrast to body
          color and must be minimum 4” thick and 18” tall for
          both sides and must be 4” thick and 20” tall for roof
          and must be clearly legible.  All racecars must have
          numbers on the right rear corner of the vehicle and   
          must be minimum 4” tall.
      b) Officials reserve the right to approve or disapprove any
          image of lettering or sponsorship on any racecar or pit
          vehicle entering race surface. Keep in mind this is
          intended to be a family fun facility.

9. Maximum 7” visor allowed on front windshield area. This includes additional tape.
10. Maximum 1” wide by 2” tall steel or lexan rub rails allowed – bolted flush to body.  Steel must be capped.

Driver Compartment

1. Driver compartment must be sealed off from engine, fuel cell, and ground.
2. No loose objects or weights/ballast allowed in driver compartment. No rear view mirrors.
3. Minimum 3 windshield bars required in front of driver and must be secured. Dash must be level with hood except for cowl in front of driver.
4. Interior must be open, no decking allowed.
5. All fuel lines passing through driver compartment must be protected by metal or galvanized pipe or conduit.
6. Factory-manufactured high back racing seats are mandatory, and must be acceptable to officials. Homemade aluminum, plastic or fiberglass seats are not allowed. Full containment seats are recommended. Driver seat may be no further back than rear edge of B-pillar on metric chassis. All others must be no further back than rear edge of front door. Seat must be bolted in using minimum 0.375” grade 8 bolts and must be secured to frame or roll cage, NOT floor pan. Seat must be mounted in left front quadrant of driver compartment.

Electrical

1. One 12 volt passenger car battery only, must be securely mounted between and above frame rails, and battery must be covered with rubber or nonconductive plastic. Battery must not be mounted in driver compartment.
2. Starter must bolt in OEM location. Aftermarket starters allowed. Car must have capability of starting without being pushed or pulled. Car must leave initial staging area on demand, unaided, or go to rear of that race.
3. GM must utilize OEM GM distributor. Chrysler and Ford may use aftermarket HEI (bushing type only). Roller bearings are not allowed. Distributors must utilize stock-type components. Circuit board modules are not allowed. No ignition boxes. Mechanical and vacuum advance may be locked.
4. No unapproved cameras, transmitting or listening devices (exception is one-way RACEceiver radio by officials), timing retard controls, or digital gauges (including tach). No electronic monitoring computer devices capable of storing or transmitting information except memory recall analog tach.
5. All wiring must be visible for inspection. OEM type alternator with internal regulator allowed. No electronic traction control devices.
6. Kill switch required within easy reach of the driver. The switch must be clearly marked “OFF” and “ON”. All battery cables and electrical must be securely mounted and protected.
7. TRANSPONDERS MUST BE MOUNTED ON THE PASSENGER SIDE OF CAR IN FIREWALL AS LOW AS POSSIBLE.  NOT MOUNTED IN THIS AREA IS AN AUTOMATIC DQ.

Fuel System

1. Automotive gasoline or racing fuel allowed ONLY!  NO E85!  No alcohol!
2. Electric fuel pumps are not allowed.  No piston style pumps allowed; diaphragm style only.
3. A limit of one (1) standard fuel filter is allowed between the fuel cell and the carburetor. Fuel filter cannot be mounted in the driver compartment.
4. No cool cans, cold air boxes, or air cleaner ductwork.

5. Carburetor:
    a)  Option 1 – 2 bbl. OEM Carburetor: GM to GM, Ford to
        Ford, Chrysler to Chrysler; must use unaltered OEM two
        barrel carburetor for that engine, except: booster I.D. 
        may be machined to 0.250”, venturi I.D. machined to 
        1.375” and throttle bore I.D machined to 1.6875” on 
        Rochester carburetor. 0.625” minimum booster height
        on Rochester carburetor. Choke plate must be removed. Car must weigh a minimum 2900 lbs. with this combination.
6. Fuel cell must be commercially manufactured for racing applications. No boat or stock automotive fuel tanks. Tanks must be securely fastened inside trunk of   racecar, above the level of stock trunk floor. Fuel cells must be in steel container. All mounts must be made of steel and surround the fuel         cell and attached to frame or roll cage. No adjustable fuel cell mounts.
7. Must have check valve. Fuel cell vent, including cap vent, must have check valves, a flapper spring or ball-type filler valve.
8. Carburetors may be claimed for $250.00 fee. See claim rules (section 21).

Brakes

1. Steel, unaltered OEM, or unaltered OEM replacement, four wheel disc or disc (front) and drum (rear) brakes. Aluminum GM drums are not allowed.  No two piece rotors.
2. A single OEM or OEM replacement master cylinder only, must be mounted in stock location.  Pushrods my be fabricated for removal of brake booster.  Pedals may be aftermarket or OEM.
3. All calipers must be OEM steel.
4. All four wheels must have functional brakes. Brakes will be tested!
5. Brake pads must contain complete friction surface, sectioning of pads prohibited.

Steering

1. All components must be steel unaltered OEM, in OEM location and match frame. OEM steering column may be replaced with steel steering shafts (steering shafts must have a joint every 5ft., collapsible steering shafts highly recommended). Steel knuckles only.
2. Quick release steering wheel coupler mandatory, may be ring or pin design.  Steel or aluminum coupler allowed.
3. Quick steer can be utilized steering box or inshaft.

Front Suspension

1. All components and mounts must be steel, unaltered OEM, in OEM location and match frame. Magnet must stick to all components.
2. OEM or OEM replacement type rubber A-frame bushings only. OEM type ball joints only. No sway bars, spring spacers, chains or cables. Exceptions are: for 1978-1987 GM mid-sized metric frame, OEM minimum of 8 or maximum of 8 1/2 control arm  upper A-frame may be replaced using aftermarket upper A-frame (steel or aluminum cross shaft allowed. Bolt on spindle savers allowed). Upper A-frame mount must remain OEM and cannot  be moved.
3. Coil springs must be minimum 4.5” O.D. and non-progressive.
4. No spring spacers, sway bars, chains, or cables allowed. No jack bolts or spring buckets allowed. Springs may be cut or heated.

Rear Suspension

1. All components and mounts must be steel, unaltered, OEM, in OEM location and match frame.
2. OEM replacement rubber control arm bushings only. Center of rear lower control arm bolt holes may be no lower than 2 1/4" - 2 1/2" from bottom of axle housing and the same on both left and right. Trailing arm bolts must remain tight.
3. Control arms must be level side to side and non-adjustable.  Control arms may be fabricated of steel 2” x 2” tubing and must remain stock dimensions.  No adjustable arms or swedge tubes allowed.  No drilling or sectioning of bushings allowed.
4. No independent rear suspension. No sway bars, panhard bars, spring spacers, extensions, chains or cables.  No spring buckets or jack bolts. 

Shocks and Springs

1. One unaltered steel, nonadjustable, stock mount shock, in OEM location, per wheel. No coil-over shocks, air shocks, remote reservoir shocks. No Schrader or bladder type valve allowed. No coil-over eliminators.
2. Coil springs must be minimum 4.5” O.D. and a maximum length of 15” and non-progressive. 

Rear End

1. OEM and Ford 9” rear-ends and floater rear-ends are permitted, but must be in stock location for that make and model. Truck rear-ends and quick changes are not allowed.
2. Rear-end may be welded or a mini spool may be used, full spools are not allowed. No torque dividing differentials.
2. Rear-end must be centered on chassis.
3. Lightened gears are not allowed. One inch inspection hole in housing required.
4. Gun-drilled or titanium axles are not allowed (axles must be made of steel).
5. All mounts must be securely welded, and in stock location with trailing arm bolt hole must be 2.25-2.50 from bottom of housing, no floating or clamped mounts.

Tires
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1. Approved, unaltered Hoosier Racing Tire asphalt F45 pull-off racing tires only are permitted.

2. Must have a durometer scale reading of 54 or higher within 15 minutes after race.  Subject to inspection before and/or after race.

3. Grooving, siping, needling, metal grinding disc and/or wrapping in plastic is not allowed. Deglazing with sandpaper disc is permitted but may not leave grinding marks of any kind. Subject to inspection before and/or after race.

4. Sidewall markings must remain visible. Buffing and/or removing compound designations is not allowed.

5. 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 are not allowed.
 
Wheels

1. May be a maximum of eight (8) inches wide, fifteen (15) inches diameter and made of steel.

2. One (1) inch steel lug nuts are mandatory on all wheels.

3. Bead locks and/or screws are not allowed.

4. Mud plug and wheel cover permitted on right rear only. Wheel cover must be made of plastic and be bolted. Dzus fasteners are not allowed. The ring that holds the wheel cover must be welded to the wheel in at least three places.

5. Bleeder valves are not allowed.

Driveshaft

1. Minimum “diameter, white, steel drive shaft only. Steel slip-yokes and differential yokes only.
2. 360-degree drive shaft loop required, constructed of at least 0.125” by 2” steel or 1”tubing, and mounted 6-inches back from front U-joint.

Transmission

Automatic transmission

      a) Must be OE automatic with torque converter. All OE    
          forward and reverse gears must be operational.
      b) Torque converter must be a minimum 10” and must 
          have a minimum 0.125” inch plug, and contain three (3)
          quarts of transmission fluid. Must be able to hold brakes
          while is running and car will not die.
      c) Must have approved scatter shield constructed of 
          minimum 0.125” by 3” steel, 270 degrees around 
          flexplate. Flexplate must be full, unaltered OEM, or OEM
          replacement. No manual bump starts allowed.

Standard transmission

      a) 3 speed OEM no aluminum case allowed. All OEM forward and
          reverse gears must be operational.
      b) Flywheels must be stock OEM and weigh a minimum of
          sixteen 16 lbs. Clutch must be a minimum 10” outside
          diameter and weight a minimum of 15.5 lbs. Lightened flywheels are not allowed. 
          Aluminum flywheels are not allowed.
      c) Must have approved scatter shield constructed of 
          minimum 0.125” by 3” steel, 270 degrees around
          flywheel.

Engine

CRATE ENGINE:

Must use unaltered sealed GM #88958602 or #19258602 crate engine. Must also run IMCA approve Rodchester 2 barrel carburetor and 6200 chip. Effective January 1, 2019, all GM 602 Crate engines must have IMCA Cable-Lock seals.  Upon inspection, any different, altered or missing GM seal bolts and not using required spacer, pushrods, valve springs or rocker arms will result in disqualification and 30-day suspension.

1. Maximum of 368 cubic inches (370 C.I. for Chrysler) is permitted. Note: Cubic inches will be checked.  Maximum 3.484” stroke for GM, maximum 3.500” stroke for Ford or Mopar.
2. Maximum 175 lbs. compression ratio.
3. OEM steel passenger vehicle production block only. No GM Bowtie, Ford   SVO or Chrysler W components allowed. GM approved block numbers are:   3892657, 3914660, 3914678, 3932388, 3932386, 3956618, 3970000, 3970006,   3970010, 3970014, 10066033, 10066036, 10243880,             14010207, 14010209,   14010287, 14016376, 14016379, 10054727, 14088528, 14088548, 14088552,   14093638, and 14101148. Stroke must match block. No 400 or larger cubic inch parts allowed. Steel only.  Absolutely no machining allowed on the exterior of the block. 
4. Flat top or dish pistons only, no gas ported pistons. OEM or OEM replacement steel crankshaft only - cannot be lightened, no 4340 cranks. GM 5.7 or 6-inch stock appearing rod allowed only. All others must have stock rod configurations with stock appearing rods. Cap screws allowed. Aftermarket rod bolts allowed.
5. Must be unaltered approved OEM and minimum 76 cc combustion chamber. Only GM OEM approved head numbers are: 14079267, 3986336, 3986339, 3986339X,   3986388, 3932441, 376445, 3928454, 3932454, 3876487, 3973487, 3973487X,   3973493, 3951598, 468642, 330862,       333882, 3998920, 3998991, 3998993,   3998997, 3970126. Maximum size valves on these heads are 1.94” intake and 1.50” exhaust. Valve springs must be stock diameter(1.250”) no beehive springs allowed.  Maximum 125 lb. seat spring pressure allowed. Screw-in studs, guide plates and poly-locks are permitted. Stud girdles are not allowed. May use Engine Quest (EQ) Stock     Replacement (SR) cylinder head, part number CH350I, head must remain as produced, seat angles and valve sizes cannot be changed: three angle valve job only (absolutely no casting removal in valve pocket of EQ head, for any reason); Ford – no aftermarket or SVO heads; Chrysler – no after       market or W-2 heads, 360 cubic inch heads only. 2.04” intake and 1.70” exhaust valves max for Ford     and Chrysler. Bowl hog 80 degree maximum and may not be any deeper than 1.50” into pocket measured from chamber floor, not valve seat.     On all heads seat angle and valve angel must remain as manufactured. Porting, polishing , angle milling or alterations of any kind to heads,  block, or intake is strictly forbidden.
6. Conventional flat tappet cam/lifters only, cannot alter lifter bores. OEM firing order cannot be changed (GM:   1-8-4-3-6-5-7-2).
7. Aftermarket performance harmonic balancers are not allowed. Stock replacement balancers only.
8. Rochester 2bbl only – may use aluminum Edelbrock #2701, 7121, 7181, 7183, or 2915 and Weiand # 7547-1, 7547, 7515, 8023, 7516, or 7545 (absolutely no modifications to aftermarket intakes). Absolutely NO port matching allowed.
9. A minimum (1) 1” plug above the oil level in the side of the oil pan is recommended. If not utilizing a plug, oil pan will have to be removed at time of inspection.
10. Only (1) minimum 2 core radiator allowed in stock location. Overflow tubes must be directed toward ground. Steel or aluminum V-belt pulleys only.  No electric fans. Aluminum water pumps allowed.
11. Stamped steel rocker arms or roller tip rocker arms only!

Exhaust

Stock unaltered cast iron exhaust manifolds only no porting or grindingallowed. Exhaust pipe must unbolt from manifold within a maximum of 5” of flange. No Chevycenter dump, Corvette, marine, Lt1 or tubular steel type manifolds. No adaptors between headand manifold must be able to use all OEM exhaust bolt holes in head, left on left right side onright side. No two into one exhaust or x pipes no anti-reversion exhaust must remain duals andpoint towards the ground must use unaltered IMCA 609 mufflers one per side in good workingcondition no leaks. Crate engines may use Schoenfeld header part number 1485-CM2-22 or OEMexhaust manifold. Claim engines may use Schoenfeld header part number 1485-20 or OEM exhaustmanifold, Unaltered painted header only.