Pure Stock

Pure Stock

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 Pure 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.
Efforts to bend or find and take advantage of a loophole in these rules will not be tolerated. If your car is not inside the rules in terms of the specific in the rulebook, you may not race.

Safety Rules
1. Apparel- See general rules.
All safety apparel must be worn while on the racing surface. This will be enforced for practice and race dates.
2. Driver must wear eye protection under race conditions. (ie goggles or face shield)
3. Neck brace is recommend.
4. Must have functional quick release steering wheel.
5. Car and equipment must pass a safety inspection by Huntsville Speedway and maintain throughout the season.
6. All safety apparel must be worn while on the racing surface. This will be enforced for practice and race dates.
General rules apply.

General Rules
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.
3. Unless specifically mentioned in the following rules, the Pure Stock division is designed to be an affordable and simple form of racing. Please keep it that way. If it is not stock, it is not legal!!
4. Recommended 2” view hole in oil pan for inspection of crank & rods.
5. Radios permitted and highly recommended.
6. No traction control devices of any kind allowed.

Competing Models
1. Must be stock unaltered OEM GM chassis.
2. All stock equipment only for that year, make and model car unless noted in rules.
3. May run 2 or 4 door car. Cars must be a minimum 108” wheelbase. Sub-framed cars allowed, but must have frame connectors. No Camaro chassis or T-top bodies permitted. No 1970-1972 Monte Carlos permitted without prior approval by HS Officials.

1. Minimum weight of 3400 pounds at qualifying and after the race.
2. No fuel burn off allowance.
3. Maximum 55% left side weight
4. Any car deemed with an unfair advantage will have to add weight at the discretion of the HS officials.
5. All ballast weight must be mounted securely and painted white with your car number on each of weights.
6. Weight boxes or ballast weight cannot be mounted lower than the lowest part of frame facing the ground anywhere, even in the trunk.

1. May remove both front inner fenders. Rear inner fender wells must remain full and intact. May cut out front fender 3” around tires. Radiator must remain in stock location. Doors, door jambs, bottom side of hood and trunk may be gutted. All fabricated body parts must be minimum of 24 gauge steel and be stock appearing. i.e. No straight or flat sides
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, 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.
5. All doors must be welded or bolted shut.
6. Side skirts allowed, but no lower than 4” from the ground.
7. 6” x 60” maximum spoiler dimensions. No side foils.
8. Numbers must be of distinguishable color and must be at least 22” high. Numbers must appear on both sides and on the roof of the car. Indistinguishable numbers may result in scoring errors.
9. Must run full stock appearing body. Floors, firewall and roof must be fully intact, except for roof center support.
10. No sectioning, chopping, channeling, or cutting of any kind to exterior body except for tire clearance.
11. All holes in front and rear firewall and floorboard must be covered with 16-ga steel.
12. Minimum of 4 quick release pins in hood and 4 quick release pins in the trunk.
13. Complete body must be steel with the exception of the front nose, tail covers, hood and trunk lid. Plastic molded nose and tail piece allowed. Fiberglass hood and trunk lid allowed.
14. No carbon fiber or aluminum body parts anywhere.

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.
2. Roll bar behind driver’s seat must be positioned in line with doorpost.
3. Roll bars must be completely welded around all connecting joints. Absolutely no pipe or pipe fittings.
4. Roll bars within driver’s reach must be padded. No swimming pool noodles. SFI rated recommended.
5. Steel plate required inside of driver side door a minimum of 1/8” thick.
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 must be at least 18” from fuel cell and approved by Huntsville Speedway.
Must have emergency cut-off switch within drivers reach and highly visible to safety crew. All 12 volt connections must be safely insulated.
9. Interior must remain open. Must be able to view complete floor pan.
10. Must have a 2 pound minimum, fully operational fire extinguisher with a gauge and with a 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 highly visible to safety crew. Driver must be able to release net from inside car. Mirrors allowed inside car only.
12. Must have aluminum racing seat; belt & shoulder harness minimum 3 inches wide. Must have belts and seat secured to the roll cage. No chains ran through floorboard to secure seat.

1. Aftermarket racing springs allowed. Minimum spring size 5” in diameter. Spring rubbers allowed.
2. Leaf springs must have same number of leafs on each side.
3. No altering of the front lower control arms permitted. Steel, polyurethane or rubber bushings allowed on front lower control arms. Stock GM sway bars only. May have only one end adjustable at the left or right lower control arm with the opposite end fixed. Must remain in stock location and inside the stock brackets at the frame.
4. Stock OEM or all steel aftermarket upper A-arms/control arms permitted. Maximum upper control arm bolt length is 3”.
5. Camber, caster and toe are the only adjustments that can be made to front suspension. No cutting, grinding, welding or bending allowed on spindles or steering links.
6. Adjustable steel spring cups permitted on all four corners. Must be welded and non-functional during race and tech. No wedge bolts permitted anywhere.
7. Rear upper and lower control arms must remain stock length and unaltered, including reinforcing. Pinion angle can be adjusted. Only by drilling upper control arms at rear end. Adjustment holes must be reinforced with washer and securely welded.
8. Rear control arm bushings may be replaced with Polyurethane or rubber replacements only.
9. All steel heavy duty stock appearing OEM replacement upper and lower ball joints permitted only.
10. Both metric or impala OEM spindles permitted with any chassis.

1. Any stock appearing steel body non-rebuildable, non-adjustable replacement shock allowed. No aluminum or air shocks allowed. One shock per wheel, must be mounted in original mounting location. No steel bearing mounting shocks allowed. No bump stops, frame stops or suspension limiters of any kind allowed.
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.

Rear end
1. Rear-end must be stock for year and model of car. May have either welded, mini spool or stock/open rear end (no Detroit or any other center section that has not been specified.)
2. No floating type rear end of any kind.

1. Front brakes and rotors must be original GM or OEM appearing with single piston steel calipers.
2. One master cylinder only.
3. No brake adjuster or block off valve of any kind.
4. No rear disc brakes permitted. Drum brakes on rear only.
5. Brakes must work on all four wheels.

1. No altering of chassis in any way.
2. Sub-frame cars 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. Minimal amount of cutting for fuel cell/box to fit through trunk floor pan will be allowed.
2. Cell must be secured with two steel straps each way over fuel cell, bolted to trunk floor. Straps must be solid and at least 1” by 1/8”. 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.

1. Chevy 350 ci only with maximum bore of 4.060”
2. Stock OEM or aftermarket crankshaft with 3.480” stoke only and weighing a minimum of 48 lbs. No knifing or polishing of rods or crankshaft. Minimum balancing of engine is allowed.
3. Stock pistons or stock replacement type pistons only. Must have four eyebrows in the top of piston with .250 to first ring land. No racing or forged pistons of any kind allowed. Floating wrist pins permitted
4. May run stock OEM or aftermarket steel rods. (No H beams) Rods must maintain stock length of 5.700”.
5. Engine block minimum deck height is 9.000
6. Any stock or aftermarket oil pan permitted.
7. May run solid or OEM replacement engine.
8. No engine setbacks permitted.

1. Stock OEM heads only, 72cc minimum combustion chamber. Maximum 1.94 intake valve and 1.50 exhaust valve. Stock replacement stainless steel valves permitted.
A. Heads must be strictly stock. Heads must maintain OEM casting numbers.
B. No porting or polishing anywhere. No deburring!
C. No racing or high performance heads.
D. No cutting of heads to install larger valve springs. Maximum valve spring size is 1.255”. No more than a single valve spring with dampener and must be magnetic steel. No beehive valve springs allowed.
E. Screw in studs and guide plates permitted.

Cam Shafts
1. Any hydraulic flat tappet cam allowed, minimum of 16 lbs of vacuum at 1000 rmp, 1.5 ratio steel rocker arms only. No roller rocker arms permitted. No roller or solid lift cam shafts permitted. No mushroom lifter, anti-pump up or over-sized lifters allowed. Lifters must bleed down during tech.

1. Any stock OEM cast iron four barrel intake allowed with a 1” aluminum spacer plate. GM low profile aluminum/marine intake allowed with no added spacer plates. No porting or polishing of intake manifold anywhere.

1. One unmodified Stock OEM four barrel quadrajet carbruator only. Must have a throttle stop and two return springs.
2. Air cleaner maximum diameter of 20” and 5” in height. Must be on car while on track. Jamb nut recommended.
3. Must run 110 octane racing fuel. (ie No E85, alcohol, or oxygenated fuels or additives of any kind)
4. No cold air boxes allowed.
5. No electric fuel pumps.

1. No headers allowed. Stock cast iron unaltered rear dump exhaust manifolds only. Exhaust pipe must be 30 inches past bell housing with muffler.

1. Must have stock HEI type ignition.

1. Only stock unmodified TH350 transmissions allowed. Must have working torque convertor. Does not have to be for make and model of car.
2. All transmissions must have 3 forward gears and a reverse gear.
3. May run solid or OEM replacement transmission mounts.

1. Steel drive shafts only. Must have one drive shaft safety loop.

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
2. Steel 8” racing wheel allowed
3. No wheel adaptors or spacers.
4. Must have 1” lug nuts.
5. No wheel weights allowed.
6. No air bleeders or pop-offs.
7. Maximum 1” offset from left to right.
8. 5/8” studs recommended.

Must abide by all general rules!!
If you have any questions about car rules, call Huntsville Speedway office.