Pure Stock

HUNTSVILLE SPEEDWAY PURE STOCK RULES 2024
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 or 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.
Warning! If you attempt to abuse the rules set forth
by Huntsville Speedway for the 2024 Pure Stock
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.

2

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 addressed in the rules, it is not legal!!
2. Recommended 2” view hole in oil pan for inspection of
   crank & rods.
3. Racing radios and neck restraints recommended.
4. No traction control devices of any kind allowed.
   Before Start of Race
5. There will be a draw or qualifying to determine starting
   order.
6. 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
7. Rear wheel drive only. Must be stock unaltered OEM GM
   chassis. Ford driver must see HS official for approval.
8. All stock equipment only for that year, make and model
   car unless noted in rules.
9. 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, Firebirds, Corvette bodies/chassis
   or T-top bodies permitted. No 1970-1972 Monte Carlos
   permitted without prior approval by HS Officials.
   Preapproved real leaf spring cars allowed with a 150 lbs
   penalty placed in center of right front floorboard.
   Weight
   Option 1: Minimum weight of 3400 pounds for box stock
   500CFM Part #4412 or a unmodified Stock OEM four barrel
   quadrajet at qualifying and after the race.
   Option 2: Miniumum weight of 3100 pounds for box stock
   350CFM Part #7448 at qualifying and after the race.

3

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 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 or under the gas tank.
7. Management reserves the right to alter, change or adjust
   weight limits to all conforming and non-conforming race cars
   without consulting any competing driver.
8. All weight penalties will be placed center of right front
   floorboard. This excludes choice of carburetor weight.
   Bodies
9. 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 26
   gauge steel and be stock appearing. i.e. No straight or flat
   sides
10. Car must not have any sharp or pointed edges that could
    harm or injure the driver, tech official or safety crew.
11. Must remove interior, headlights, taillights & all side
    glass, must leave interior open.
12. Must have 1/8” Lexan/Polycarbonate full windshield. No
    Plexiglas- No Exceptions. Must allow 5” at top of windshield
    for division sponsor sticker.
13. All doors must be welded or bolted shut.
14. Side skirts allowed, but no lower than 4” from the ground.
15. 6” x 60” maximum spoiler dimensions. No side foils, fins,
    splitters, chin spoilers, or ledges allowed anywhere.
16. 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

4

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 minimum 26 gauge 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.
    Interior
15. 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.
16. Roll bar behind driver’s seat must be positioned in line
    with doorpost. Abuse of this rule will result in weight
    penalties.
17. Roll bars must be completely welded around all
    connecting joints. Absolutely no pipe or pipe fittings.
18. Roll bars within driver’s reach must be padded. No
    swimming pool noodles. SFI rated recommended.
19. 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.
20. Seat and seat belts must be attached to roll cage only.
21. 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).
22. Battery must be at least 18” from fuel cell and approved
    by Huntsville Speedway.
    Must have emergency cut-off switch within drivers reach and

5
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 or weight penalties will apply.
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 2 inches wide. Must have belts and seat
    secured to the roll cage. No chains ran through floorboard to
    secure seat.
    Suspension
13. 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.
14. Rear leaf springs allowed with a 150 lbs penalty to be
    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 screw
    type wedge adjustments permitted. No sliders, no lowering
    blocks or pinion shims allowed.
15. 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.
16. Stock OEM or all steel aftermarket front upper A-
    arms/control arms permitted. Maximum upper control arm
    bolt length is 3”.
17. Camber, caster and toe are the only adjustments that

6
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.
   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 hard
   Polyurethane or OEM rubber replacements only.
9. All steel heavy duty stock appearing OEM replacement
   upper and lower ball joints permitted only.
10. OEM spindles only. Must be correct for chassis being
    used. Spindle part numbers must be present and clear to
    read.
11. NO RACING OR PERFORMANCE PARTS ALLOWED
    UNLESS NOTED HERE IN THE RULES.
    Shocks
12. 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 factory mounting location. No steel bearing
    mounting shocks allowed. 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 to purchase all
    competing shocks in this division at any time to preserve
    equal and fair competition.
    Rear end
13. Rear-end must remain stock for year and model of car.

7
Rear end brackets must remain in factory location with
factory welds. May have either welded, mini spool or
stock/open rear end (no factory or aftermarket lockers of
any kind)

2. No floating type rear end of any kind.
   Brakes
3. Front brakes and rotors must be original GM or OEM
   stock replacement with single piston steel calipers.
4. Only one OEM stock replacement master cylinder
   allowed.
5. No hydraulic brake pressure adjuster or block off valve of
   any kind.
6. No rear disc brakes permitted. Drum brakes on rear
   only.
7. Brakes must work on all four wheels.
   Frame
8. No altering of chassis in any way. Repaired chassis may
   be subject to weight penalties if repairs are done incorrectly.
9. Sub-frame cars must have frame connectors approved by
   Huntsville Speedway.
   Fuel Cell
10. 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.
11. 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.
12. 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

8

an HS official.

4. No electric fuel pumps allowed. Camshaft driven fuel
   pumps only.
   Engine
5. Chevy 350 ci only with maximum bore of 4.060”
6. Stock OEM or aftermarket crankshaft with 3.480” stoke
   only and weighing a minimum of 49 lbs. No knifing or
   polishing of rods or crankshaft. Minimum balancing of engine
   is allowed.
7. 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
8. May run stock OEM or aftermarket steel rods. (No H
   beams) Rods must maintain stock length of 5.700”.
9. Engine block minimum deck height is 9.000
10. Any stock or aftermarket oil pan permitted.
11. May run stock or OEM replacement engine. No sodium or
    titanium engine parts of any kind.
12. No lowering or setback of engine from factory permitted.
13. 5800 RPM/rev limiter chip must be mounted in MSD Soft
    Touch Rev Control Box #8728 and fully functional at all
    times. Box must be mounted on right side firewall 20 inches
    or less from center of distributor shaft. Box will be tested at
    3000 RPMs. Chip will be tested for 5800 RPMs.

Heads

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

9
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, 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. 15 minute allowance only.
   Intake and Carburetor
   Option 1.
2. Any stock OEM cast iron four barrel intake allowed with a
   1” metal spacer plate. GM low profile aluminum/marine
   intake allowed with a 1” metal spacer plate. No porting or
   polishing of either intake manifold anywhere.
3. One unmodified Stock OEM four barrel quadrajet
   carbruator only.
   Option 2.
4. Edelbrock Performer intake Part #2101 with adaptor
   plate plus a spacer plate together not exceeding 1” and a
   box stock Part #4412 Holley 500CFM, or Part #7448
   350CFM two barrel only. Choke flap and horn may be
   removed. No porting or polishing of intake manifold
   anywhere.
5. Edelbrock Performer intake Part #2701 with adaptor
   plate plus a spacer plate together not exceeding 3/4” and a
   box stock Part #4412 Holley 500CFM, or Part #7448
   350CFM two barrel only. Choke flap and horn may be
   removed. No porting or polishing of intake manifold
   anywhere.
   In addition to options 1 and 2:
6. All carb options must be 100% box stock with no visible
   signs of modifications and must pass HS No-Go gauges.
7. Must have a throttle stop and two return springs.

10

3. Air cleaner maximum diameter of 20” and 5” in height.
   Must be on car while on track. Jamb nut recommended.
4. Must run Huntsville Speedway 110 octane racing fuel. (ie
   No E85, alcohol, or oxygenated fuels or additives of any
   kind)
5. No cold air boxes allowed.
6. No electric fuel pumps.
7. Maximum of all total gasket height not to exceed 1/8”
   between carburetor and base of intake.
   Exhaust
8. No headers allowed. Stock cast iron unaltered rear dump
   exhaust manifolds only. Exhaust pipe must be 30 inches
   past bell housing with muffler.
   Ignition
9. Must have stock HEI type ignition. 5800 RPM/rev limiter
   chip must be mounted in MSD Soft Touch Rev Control Box

8728 and fully functional at all times. Box must be

mounted on right side firewall 20 inches or less from center
of distributor shaft. Box will be tested at 3000 RPMs. Chip
will be tested for 5800 RPMs.

Transmission

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.
   Driveshafts
4. Steel drive shafts only. Must have at least one drive
   shaft safety loop, minimum of 1/8” steel strap or 1” tubing
   looped around the driveshaft within 24” of rear ujoint.
   Cooling System

11

1. No antifreeze permitted. $250 fine.
2. Overflow on radiator must have catch can.
3. Aluminum radiator allowed.
   Tires and Wheels
4. American Racer KK704 only. Must have Huntsville
   Speedway stamp. (subject to change for special events)
5. Only steel 8” racing wheels allowed.
6. No wheel adaptors or spacers.
7. Must have 1” lug nuts.
8. No wheel weights allowed.
9. No beadlocks, air bleeders or pop-offs.
10. Maximum 1” offset from left to right.
11. 5/8” studs recommended.
     If you have any questions about car rules, call Huntsville
    Speedway office.