Pro Stock


Pro Stock:

  • This division was created as a controlled, economical and competitive form of racing.
  • Any North American made car 1968 to present.
  • No jeeps, station wagons, compact cars, trucks, four wheel drive vehicles, convertibles or corvettes.
  • No enduro cars


  • Frames must remain stock appearing.
  • Frame rail front to back must be constructed with a minimum 10 inch circumference .090 min. thick.
  • Cars with uni-body construction must be connected from the rear of the front clip to the front of the rear clip.
  • 2×3 frame material can be used to replace stock frame or to tie a uni-body chassis together.
  • Minimum 103” wheelbase allowed.
  • Roll cage must be four post design. Tip of roll bar must be connected to form a box section and be at least four inches above driver’s head. Bars must be securely fastened to the frame by welding, no screwed pipe fittings allowed.
  • All roll bars must be a minimum of .090 wall thickness. Seamless tubing of 1 ¼” or seamed tubing of 2” outside diameter must be used.
  • Must have at least (3) door bars on driver’s side and ( 2) door bars on passenger side.
  • Bracing around d the engine and radiator required a maximum 2” pipe. One loop must be used with bracing allowed on each side from loop to frame and must be tied into main roll cage.
  • Bracingt must be kept inside fenders. No bracing may extend beyond the bumpers. No sharp edges are\ allowed.
  • 2 bars must run from top of roll cage to rear frame. Bracing must be inside of the trunk.
  • Cars must have securely fastened front and rear bumpers AT ALL TIMES.
  • Rub rails are not permitted.
  • No extreme bracing allowed.


  • Strut plate on strut cars may only have one set of adjustable strut mounting holes.
  • Stock suspension only is permitted. All springs must remain in stock location.
  • Weight jacks can be used in the front on leaf spring cars.
  • Sotck frame cars OEM frames can have weight jacks on all 4 coil springs.
  • Steel top tubular “A” arms may be used. Bottom A-arms must be stock.
  • Only one shock with a fixed heim end is allowed per corner of car.
  • Ford and Mopar may run full frame with all stock chassis components. Four bar cars may run a pan hard bar in stock location.       No heim ends allowed.


  • All suspension parts must be stock or stock type replacement.
  • Rear leaf sprins may be mounted with no more than a 3” maximum difference front to rear.
  • No leaf spring slider mounts permitted.
  • No leaf spring weight jacks permitted
  • Must use weld on stock type spring pads. No birdcage type mounts are allowed.
  • All stock and aftermarket spring pads must be Fully welded (not just tacked) TO THE AXLE TUBE.
  • No material is to be used under or between the U-bolts and the axle tube.
  • Lower spring plates must remain stock and unaltered. Leaf spring centering bolt hole must remain untouched.
  • No torque arms, birdcages, or lift bars are allowed
  • Rears can be dropped and blocks are permitted under rears.
  • No adjustable blocks under rears.
  • No adjustment nor adjustability of suspension components in any way.
  • No heim ends anywhere in the suspension.


  • Heim end shocks are allowed but:
    1. Must be non-adjustable steel bodied fixed end shocks.
    2. shocks can be oil or gas filled
    3. Any shock having a gas port, Schrader valve or bladder type valve must have the valve plugged.
    4. Non strut cars may move front shock mounts to the outside of the A-arm.
    5. No coil over shocks anywhere.
    6. No reservoir shocks allowed.


  • All springs and spring pockets must remain in stock location.
  • Steel leaf springs only, must be stock appearing and full length.


  • Must have operational 4 wheel brakes. Rotors must be steel.


  • CUBIC INCH 360 cubic inch
  • 602 Crate with 4 barrel OK.


  • No aluminum blocks.
  • Block casting numbers must be in place.


  • All engines 11:1 compression ratio maximum on track whistle box.


  • Flat top pistons only.


  • Any steel 6.0 inch rod or under (NO TITANIUM OR ALUMINUM NAY BE USED)
  • No polishing or reworking.
  • No addition or removal of metal other than normal balancing.


  • Dart or Angle-Plug heads are permitted. No aluminum heads. Headers permitted.
  • All engines must be pumped, whistled and sealed by Clinton County Raceway technical personnel before they are allowed to compete.
  • Cars will not be allowed to compete with engines that are not properly sealed.
  • All engines will be checked with no heat in thee engine.
  • The second and third head bolt on either side of the engine must be drilled with at least a .060 hole to accept the seal. Any care found to have competed in an event with an engine that has not been sealed by Clinton County raceway technical personnel or has a missing or altered seal will be disqualified and lose all points and prize money from said event and may face further penalties.


  • Only hydraulic or solid flat tappet cams are permitted. No roller cams or roller, radius or mushroom lifters permitted.
  • No light weight lifters permitted.
  • No 4-7 swap camshafts permitted, Stock OEM firing order must be maintained.



  • No titanium valves.
  • No shaft rockers permitted.
  • Roller TIP rockers are permitted.
  • High valve covers are permitted.


  • Any stock appearing cast iron or forged steel crankshaft is permitted. (no titanium)
  • No polishing or reworking.
  • No addition or removal of metal other than normal balancing.


  • No dry sump systems allowed. Must use traditional type pan and pump.


  • Limited to one 2-barrel 500 CFM HOLLEY. Must use part #0-4412. No predators, No dominators.
  • No modifications allowed except for jet changing.
  • Must fit track Go-No Go gauges. Only the choke plate may be removed with all screw holes permanently sealed.
  • Four barrel aluminum in-take is permitted. Adapters permitted.
  • No adding of material to top of intake allowed. Must be intake, gasket, Adapter, Gasket, Carburetor.
  • Adapter thickness 1-1/2 inches maximum with one stock gasket above and below adapter plate.


  • All engines are subject to having intake and/or heads pulled at the track.
  • Refusal to pull intake and/or heads will result in automatic disqualification for that event.


  • Racing gasoline only.
    1. No alcohol
    2. No additives
    3. No oxygenated race fuels.


  • Stock type HEI ignition only.


  • Engine set back will be measured from face of rear end housing to back of engine block.
  • Measurements will be dictated by wheelbase as follows:
    1. Wheel base- minimum measurement: 103-81”
    2. 104-82”
    3. 105-83”
    4. 106-84”
    5. 107-85”
    6. 108-86”


  • Wheelbase is measured from center of front spindle to center of rear axle.
  • All strut cares must have at least 103” non-adjustable wheelbase.
  • Full frame car wheelbase may not be under 103”
  • Maximum difference from side to side is 1”
  • If car measures 103” on left side, maximum wheelbase on right side is 104”.
  • If car measures 104” on left side, minimum wheelbase on right side is 103”.


  • Ford 9” rear optional with mounts in stock location on any model car. (no floater or fast boy setups).
  • Grand National type rears (with floating axles) are allowed for safety with mounts in stock location on any model car.
  • Stock and/or stock type aftermarket spring pads only, must be fully welded (no tacked) to the axle tube.
  • Rear ends can not have any type of built in camber adjustments nor can they have any toe in or out built into the housing. Hubs must remain at 90 degree angle to the axle tube in all directions.
  • No birdcage type mounts allowed:
    1. No shape or form or type of birdcage type mount is allowed
    2. You must have stock type spring pads on your rear axle tubes. NO EXCEPTIONS.
  • No material is to be used under or between the U-bolts, spring pads and the axle tube.
  • Absolutely no tampering with axle tubes.
  • No camouflaging of rear axle tubes allowed.
  • No torque tubes, lift bar(s) or traction devices allowed on any rear end. NO EXCEPTIONS.


  • No 1:1 transmissions allowed, (BERT, BRINN , ECT.)
  • Steel blow proof bell housing MANDATORY with ONE 2 inch diameter inspection hole located in thee 6 O’clock or 12 O’clock position. Dust covers must be easily removed for tech inspection.
  • Transmission must be GM to GM, Ford to Ford, etc.
  • Must have working reverse.
  • No aluminum flywheels. No coupler type clutches
  • Clutch must be working at all times.
  • Drive shaft loops required.
  • Drive shaft must be painted WHITE.


  • Must have converters


  • Car must have a complete floorboard: area under driver should be reinforced.
  • Rear deck behind driver may either be flat or run up hill to front of deck lid, either way it must be of one flat plane and can not be used as a spoiler.
  • No boxing in of the drivers compartment is allowed. Area can remain open door to door or sheet metal must run on a 45 degree angle away from the driver from the top of the drive shaft tunnel to top of right door.
  • All glass must be removed. No windshields are permitted. No broken glass may be in any part of care including door panels.
  • Window screens are mandatory in place of windshield. These must be secured with 3 supports.
  • All flammable materials must be removed from car.
  • Firewall must be completely enclosed. No open holes.
  • Cars must have a complete steel firewall between trunk and driver.


  • Bodies may be constructed of aluminum or steel panels.
  • Body must resemble an OEM stock body with stock appearing body panels, body lines, curves and shapes.(stock appearance will be at the discretion of track officaials.)
  • Body panels must match the shape of nose used, Example: Camaro nose car MUST have a Camaro shaped body etc.
  • All cares must have a minimum of 1” and a maximum of 2” of roll at top of fenders, doors, and quarter panels. No squared off or 90 degree bends anywhere on the body.
  • All bodies must be in good condition. Stock appearing and securely fastened. Bodyline must be a smooth even line from front to rear. All body panels must be solid. No holes, slots, or air gaps are permitted.
  • No wings or spoilers or a trunk lid that appears to look like one. No fins or raised lips of any kind are permitted anywhere along the entire length of the car.
  • Area between bottom inside of deck lid and “top” of main frame rail must be permanently closed in.
  • The fuel cell can be lowered and placed between the frame rails. BUT it may not sit lower than the center of the rear end and must have a hoop welded under the bumper protecting it.
  • No “belly pans” or type of enclosure on bottom of cars will be permitted.
  • Skid plate to protect oil pan is permitted.
  • No panels of any kind under thee rear deck running from the front to the rear of the car.
  • Race cars must be safely maintained and kept in presentable condition.
  • No “slope” or “wedge noses” permitted.
  • Stock appearance will be at the discretion of track officials.


  • Sloped front noses (Late Model MD3 or Late Model Classic style noses) will no be permitted.       No wedge.


  • Must resemble size and shape of factory OEM panels.
  • Sail panels must be flat front to back and top to bottom.


  • Must measure the same at both right and left “A” pillars.
  • 20 inches max length on rear roof pillars


  • Must measure the same height on both sides.


  • Between the quarter panels must be solid corner to corner. No “V” shaped rear panels.


  • Hosier or American Racer
  • 26.5/8.0-15 SCL Medium, Hard
  • 27.5/8.0-15 NRM Medium, Hard
  • All factory sidewall markings must remain intact and visible at all times.
  • No grinding, buffing, altering, or attempt to alter any sidewall designations or markings is permitted.
  • Tires found in violation or that are missing any information for any reason will be considered illegal.
  • Cars found to have an unapproved tire (s) or an illegal tire (s) will cause the car and drive to be disqualified.
  • If discovery is made during any race or time trial or during any post race or time trial technical inspection, the car and driver will be disqualified, scored last for thee race and will not be permitted to participate in any remaining races scheduled for the event. Both car and driver will also forfeit any and all championship points, awards and prize money for the event.


  • Steel wheels only with 8” maximum rim width.
  • All wheels must be reinforced and be attached with oversize lug nmuts.
  • Steel beadlocks are allowed.


  • Total weight of car and driver may not be less than 3,000 lbs.
  • Weigh-ins to be after any event or qualifying.
  • Weight to be measured as car comes off of the track in the condition that it took the checkered flag.
  • All weight is to be either welded or properly secured to the car with no less than grade 8 bolts and lock nuts.
  • Any car in the top 5 of any event, or any other car directed by speedway officials, that does not go directly to the scales first before the car stops with the crew and/or at the trailer will be disqualified and scored last for that event.
  • If a car fails to make weight the first time across the scales, the driver will be given the opportunity to weigh a second time, after the cars in qualifying order have been weighed. (no crew members are to work on car at this point)       Upon re-weigh the driver will be asked to shut his engine off and sit still in the seat. If at that point the car still does not make weight it will be considered disqualified for that event.
  • Strut cars must add 35 lbs. from back of motor forward.


  • No radios (one way or two way) or other means of electronic communications between the driver and anyone other than track official is permitted.
  • All drivers are required to use a receiver capable of receiving frequency 454.000 for one way communications from track officials.



  • Car numbers must be at least 18” high and 2” wide and painted on both sides of the car.
  • No rear view mirrors of any type.


  • Fuel cell is mandatory and must be securely fastened with at least 2 one inch straps inside the trunk.
  • Fuel cell placement must be between frame rails
  • Fuel cells may not sit lower than the rear end.
  • Rear of fuel cell must be protected with hoop under and above rear bumper.
  • Fuel cell vent hose must extend equal to or lower than bottom of fuel cell.


  • The battery may be relocated but must be securely fastened and have a protective covering regardless of location.
  • No batteries are to be located in the drivers compartment.


  • There will be a time limit on the Pro Stock heat races: 5 laps, or 10 minutes, whichever expires first.
  • Thee time limit on the feature event, unless it is the last event on the program will be 15 laps or 30 minutes.

*Note these rules are subject to change during the racing season.

*Variations from any specification or rule must be approved by the speedway tech officials.

 *The officials’ interpretation of these rules is FINAL.