Super Stock
HUNTSVILLE SPEEDWAY SUPER STOCK RULES 2025
RULE BOOK DISCLAIMER
The rules and/or regulations set forth herein are designed to provide for the orderly conduct of racing events and to establish minimum acceptable requirements for such events. These rules shall govern the condition of all events, and by participating in these events, all participants are deemed to have complied with these rules. NO EXPRESSED OR IMPLIED WARRANTY OF SAFETY SHALL RESULT FROM PUBLICATIONS OF OR COMPLIANCE WITH THESE RULES AND OR REGULATIONS. They are intended as a guide for the conduct of the sport and are in no way a guarantee against injury or death to a participant, spectator or official.
The race director shall be empowered to permit reasonable and appropriate deviation from any of the specifications herein or impose any further restrictions that in his/her opinion do not alter the minimum acceptable requirements. NO EXPRESSED OR IMPLIED WARRANTY OF SAFETY SHALL RESULT FROM SUCH ALTERATION OF SPECIFICATIONS. Any interpretation of deviation of these rules is left to discretion of the officials. Their decision is final.
The Management of Huntsville Speedway
Due to the many types of cars that can be built under the Super Stock rules, it is impossible for these rules to cover every situation that might occur. Officials are given discretion, following the intent of the rules and to rule on any matter not covered specifically in the rulebook.
Warning! If you attempt to abuse the rules set forth by Huntsville Speedway for the 2025 Superstock Division, we will have no choice but to refuse your request for participating. Just because the rules don’t say you can’t, does not mean that you can!
Safety
Refer to Huntsville Speedway’s General Rules for a full list of rules regarding driver, pit and car safety.
Competition Rules
1. Unless specifically mentioned in the following rules, the Super Stock division is designed to be an affordable and simple form of racing. Please keep it that way. If it is not stock or otherwise address in the rules, it is not legal!!
2. Racing radios and neck restraints recommended.
Before Start of Race
1. There will be a draw or qualifying to determine starting order.
2. All starts will be double file, cone rule will apply on restarts. The winner of the previous race will start in the rear the next race he/she competes, regardless of the draw or qualifying order.
Competing Models
1. All stock equipment only for that year, make and model car unless noted in rules.
2. Rear wheel drive only. May run 2 or 4 door car. Cars must maintain factory wheelbase of no less than 108” or add 25 lbs for every inch under 108” wheelbase. 104” will be the minimum allowed wheelbase. Preapproved sub-framed cars allowed but must have frame connectors. No Camaro, Firebird or Corvette bodies/chassis or T-top bodies permitted. No 1970-1972 Monte Carlos permitted without prior approval by HS officials. Preapproved rear leaf spring cars allowed with a 150 lbs penalty placed center of right front floorboard. Mopar – see HS Official for rules.
Weight
1. Management reserves the right to alter, change or adjust weight limits to all conforming and non-conforming race cars without consulting any competing driver.
2. a. 350 cfm carb cars must weight a minimum weight 3100 pounds before qualifying and after the race.
b. 500 cfm carb cars must weight a minimum weight of 3300 pounds before qualifying and after the race.
3. Driver must post their claimed weights at all times on the top left corner of windshield in 1.5″ tall numbers. Numbers must be easily visible to HS officials. White vinyl numbers are preferred.
4. Maximum 55% left side weight – manual trans
Maximum 56% left side weight – automatic trans
5. Any dominating car deemed with an unfair advantage will have to add additional weight at the discretion of the HS officials. (i.e. with back to back wins with car count considered)
6. All ballast weight must be mounted securely and painted white with your car number on each weight.
7. Weight ballast cannot be mounted any lower or to the lowest part of frame rails facing the ground anywhere, even in the trunk. No weights shall be hung or mounted directly in front of, behind, beside or under the gas tank.
8. No fuel burn off allowance.
9. All weight penalties will be placed center of right front floorboard. This excludes carb choice and roller cam shaft penalty.
Bodies
1. May remove both front inner fenders. Rear inner fender wells must be closed to protect driver from track debris. May cut out front fender 3” around tires. Radiator must be stock location. Doors, door jambs, bottom side of hood and trunk may be gutted. All metal body parts must be minimum 26 gauge sheet steel.
2. Car must not have any sharp or pointed edges that could harm or injure the driver, tech official or safety crew.
3. Must remove interior, headlights, taillights & all side glass, must leave interior open.
4. Must have 1/8” Lexan/Polycarbonate full windshield. No Plexiglas- No Exceptions. Must allow 5” at top of windshield for division sponsor sticker. Non-local cars – see HS Official for approval.
5. All doors must be welded shut.
6. Side skirts allowed, but no lower than 4” from the ground.
7. 6” x 60” maximum spoiler dimensions. No side foils, fins, splitters, chin spoilers or ledges allowed anywhere.
8. Numbers must be of distinguishable color and must be at least 20” high. Numbers must appear on both sides and on the roof of the car. Indistinguishable numbers may result in scoring errors.
9. Stock body mounts may be removed.
10. Must run full stock appearing body. Floors, firewall and roof must be fully intact and in stock location, except for roof center support or penalties will apply.
11. No sectioning, chopping, channeling, or cutting of any kind to exterior body except for tire clearance.
12. All holes in front and rear firewall and floorboard must be covered with 16-ga steel.
13. Minimum of 4 hood pins and 4 trunk pins.
14. Complete body must be minimum 26 gauge steel with the exception of the front nose and tail covers. Plastic molded nose and tail piece allowed.
15. No fiberglass or carbon fiber parts anywhere except for AR-Bodies replacement hood and trunk lid.
Interior
1. Car must have a four point roll cage with four bars in drivers door running horizontal. Passenger door must have a minimum of an “X” bar with horizontal bar on top or identical to drivers side roll cage. All roll bar tubing must be 1 ¾” od X .095 wall. All roll cages must be approved by HS officials.
2. Roll bar behind driver’s seat must be positioned in line with doorpost. Abuse of this rule will result in weight penalties.
3. Roll bars must be welded. No pipe fittings.
4. Roll bars within driver’s reach must be padded.
5. 1/8” steel platting of the roll cage or 1/8” solid steel plate required inside of drivers door from A post to B post.
6. Seat and seat belts must be attached to roll cage only.
7. You will be allowed to run bay bars to support the front part of the frame and 2 bars to the rear of the frame (welded no further towards the rear than the front side of the rear spring buckets).
8. Battery mount must be at least 18” from fuel cell.
Must have emergency cut-off switch within drivers reach and highly visible to safety crew.
9. Interior must remain open. Must be able to view complete floor pan or weight penalties will apply.
10. Must have a 2 pound minimum, fully operational fire extinguisher with a gauge and an all steel quick release mounted securely in car within reach of driver while belted in car.
11. Must have quick release type window net on drivers side window. Window net must release from top of net towards front of car and be highly visible to safety crew. Driver must be able to release net from inside car. Mirror is allowed inside car only.
12. Must have aluminum racing seat; belt & shoulder harness minimum 2 inches wide. Must have belts and seat secured to the roll cage.
Suspension
1. Front & rear springs must be the same diameter and height of other (front to front, rear to rear) and fit in spring pockets. Minimum 5” in diameter. Spring rubbers allowed
2. Rear leaf spring allowed with a 150 lbs penalty placed in center of right front floorboard.
Leaf springs must have same number of leafs on each side. Must mount in both front and rear factory mounting locations. No sliders, no lowering blocks or pinion shims allowed.
3. Lower A-arms/control arms, must remain stock length, even if purchased as OEM aftermarket replacement parts.
4. Tubular aftermarket all steel front upper control arms permitted (any length) with no weight penalty.
5. Sway bar must be stock type. May have one end adjustable at top side of lower control arm. Must remain in stock location and brackets mounted directly to frame. Anything outside this description is a 60 lb penalty placed center of right front floorboard. No spline bars permitted. Maximum upper control arm bolt length is 3”.
6. Camber, caster and toe are the only adjustments that can be made to front suspension. No cutting, grinding, or bending allowed.
7. No wedge bolts on front or rear springs. Visible non-working or functional wedge bolts permitted on rear springs with a 60 lb penalty placed center of right front floorboard.
8. Adjustable spring cups permitted.
9. Any non-rebuildable stock mounting and appearing rebound adjustable replacement shock allowed. No air shocks allowed. One shock per wheel. All shocks must mount in factory location using factory bolt holes. All shocks must maintain their factory designed rubber insulators. No bump stops, frame stops or suspension limiters of any kind allowed.
Post Race Shock Buy Out – $60/per shock claim rule. Buyer must buy all four shocks at time of protest. All four shocks must be delivered to tech official undamaged and fully functional. Any person that does not submit to the claim rule will be Disqualified, NO Points, NO Money. Also, they will not be allowed to bring those shocks back at any time. Huntsville Speedway also reserves the right of purchase all competing shocks in this division at any time to preserve equal and fair competition.
10. Pinion angle can be adjusted. Only by drilling upper control arms at rear end. Adjustment holes must be reinforced with washer and securely welded.
11. Rear lower control arms must remain stock length and unaltered, including reinforcing.
12. Front and rear control arm bushings must remain stock or replaced with OEM stock replacement bushings.
13. NO RACING OR PERFORMANCE PARTS ALLOWED.
14. OEM spindles only. Must be correct for chassis being used. Spindle part number must be present and clear to read.
Rear end
1. Rear-end must remain stock for year and model of car. All rear end brackets must remain in factory location with factory welds. May have either welded, mini spool or open rear end (no factory or aftermarket lockers of any kind)
2. No 9” inch rear end unless stock for year and model of car. Must provide proof of VIN and door plate from factory.
3. No floating type rear end of any kind.
4. 100 lb penalty will be placed center of right front floorboard for non-factory rear end housings. No floaters.
Brakes
1. Brakes must work on all four wheels. Drum brakes on rear only.
2. OEM single piston steel caliper brakes on front only.
3. One master cylinder only.
4. No hydraulic brake pressure adjusters or block off valve of any kind.
5. 60 lb penalty for rear disk brakes, 20 lb penalty for aluminum rear calipers. Penalty to be placed in center of right front floorboard.
Frame
1. Factory stock frames only. May be reinforced. Frame may be fabricated 6” forward from the centerline of the car axel to the rear of car. No other notching or alterations to frame allowed. See competing models for frame penalties.
2. No part of frame can be lower than 6 inches from the ground, with driver and safety equipment, before and after the race.
3. Preapproved sub-frame cars allowed, but must have frame connectors approved by Huntsville Speedway.
Fuel Cell
1. Fuel cell with roll over check valve required in trunk area in metal box and must have a firewall between fuel cell and driver. Removal of trunk floor pan will be allowed.
2. It is recommended that fuel cell should be located as far forward as possible, but stay behind the differential housing. Fuel cell must be between frame rails with proper ground clearance and secured with two 1/8” x 2” steel straps or four 1/8” X 1” steel straps and must be approved by HS officials. Full fuel cell cage welded to the frame is recommended.
3. Fuel cell may not be lower than 10” to the ground and must be protected by one protector bar extending the width of fuel cell with one center brace. Protector bar must be 1 ¾” X .095 and at least 1” lower than cell and is approved by an HS official.
4. No electric fuel pumps allowed. Camshaft driven fuel pumps only.
Engine
1. Maximum cubic inch allowed: Chevy 360 ci, Ford 362 ci, Mopar 370 ci – See HS Official for complete engine specs.
2. Stock OEM crank only, weighing a minimum of 49 lbs. No lightweight or knifing. Crank must maintain OEM casting numbers. No polishing of rods or crank. Minimum balancing of engine is allowed.
3. Must have stock pistons or stock replacement type. Two or four eyebrow pistons .250 to first ring land. Full floating pins permitted.
4. Engine block minimum deck height is 9.000 at TDC. Stock Bore and stroke (maximum .060 overbore)
6. May run aftermarket stock type steel rods. (No H beams) Rods must maintain stock length. Chevy 5.7” only, Ford 6.0” only
7. Heads must be strictly stock. Heads must maintain OEM casting numbers.
8. No sodium or titanium engine parts of any kind.
A. No porting or polishing anywhere. No deburring!
B. No racing or high performance heads. Maximum 1.94 intake and 1.50 exhaust- Chevy; Maximum 1.94 intake and 1.60 exhaust- Ford;
C. No cutting of heads to install larger valve springs. No more than a single valve spring with dampener and must be magnetic steel. Stock diameter only. Maximum 1.255. No beehive valve springs allowed.
D. No Aluminum heads. No performance heads. No GM angle plug heads. No Aftermarket heads. No bowtie heads.
E. Vortec heads allowed.
F. 64cc minimum combustion chamber for Chevy. 63cc minimum combustion chamber for Ford.
9. Any non-roller hydraulic camshaft allowed. Add 25 lbs for hydraulic roller camshaft. See HS official for penalty location. No solid lift camshafts allowed. No mushroom lifter, anti-pump up or over-sized lifters allowed. Lifters must bleed down during tech. 15 minute allowance only.
10. Screw in studs allowed. Stud girdles and poly locks allowed.
11. Full Roller rockers permitted, NO SHAFT ROLLERS ALLOWED
12. Any aluminum or cast iron, two or four barrel intake allowed only. No porting or polishing of intake manifold anywhere. $200 claim rule on intake.
13. Must run Holley 500 cfm #4412 two-barrel carburetor when weighing 3300 pounds or 350 cfm #7448 when weighing 3100 pounds. Both carbs options must be 100% box stock with no visible sign of modifications and must pass HS No-Go gauge. Choke flap and horn may be removed.
a. Must have a throttle stop and two return springs.
b. 1 inch spacer maximum, adapter must be metal. Maximum of 1 1/8” between carburetor base and intake.
14. Must run Huntsville Speedway 110 octane racing fuel. (ie No E85 or alcohol, or oxygenated fuels or additives of any kind)
15. No cold air boxes allowed. All air entering engine must pass through carburetor venturi.
16. Headers allowed.
A. Must have a maximum of 1 5/8” O.D. No tuned headers.
B. Exhaust pipe must be 30 inches past bell housing.
17. May run solid engine and transmission mounts.
18. No engine setbacks permitted from factory position. 25 lb per inch penalty to be placed in center of right front floorboard.
19. All cars must run HEI type distributor or stock ignition system.
Transmission
1. Any stock unmodified cast iron manual transmission allowed. Does not have to be for make and model of car.
2. No power glides allowed.
3. Stock unmodified automatic transmissions allowed, must have full size working torque converter.
4. No aluminum or performance transmissions of any kind allowed. Fords must see HS Officials for weight penalties.
5. All transmissions must have 3 forward gears, a reverse gear and trans cooler mounted inside the car.
6. Steel drive shafts only. Must have one drive shaft safety loop, minimum of 1/8” strap or 1” tubing looped around drive shaft within 24” of rear u-joint.
Clutches
1. Minimum stock 10-1/2” clutch assembly
2. Must have approved steel safety bell housing with an inspection hole in the bottom. (No Aluminum Bell Housing). Fords must see HS Officials for weight penalties.
3. Hydraulic throw out bearings are permitted
4. No aluminum clutch, pressure plate, or flywheel parts.
5. The total weight of clutch, pressure plate, and flywheel may not weight any less than 31 lbs. with the bolts!! Clutch and flywheel must remain visible for inspection purposes without need of tools.
Cooling System
1. No antifreeze permitted. $250 fine.
2. Overflow on radiator must have catch can.
3. Aluminum radiator allowed.
Tires and Wheels
1. American Racer KK704 tires only. Must have Huntsville Speedway. (subject to change for special events)
2. Only steel 8” racing wheels allowed.
3. No wheel adaptors or spacers.
4. Must have 1” lug nuts.
5. No wheel weights allowed.
6. No beadlocks or air bleeders or pop-offs.
7. Maximum 1” offset from left to right.
8. 5/8” studs recommended.
If you have any questions about car rules, call Huntsville Speedway office.
