HOBBY STOCK CLASS RULES
1. The rules and/or regulations set forth herein are designed to provide for the orderly conduct of racing events at Southwest Speedway and to establish minimum acceptable requirements for such events. These rules shall govern the condition of all events at Southwest Speedway, 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.
2. The race directors shall be empowered to permit minor 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.
3. Any interpretation or deviation of these rules is left to the discretion of the officials. All decisions are final.
4. No high performance stock or otherwise parts are allowed in this class. Suspension, engine and drive train must remain stock to the make and model of car being raced.
The Board of Directors reserves the right to tech any car at any time.
1. Factory specifications of any American made car from 1966-1995.
2. No vans, trucks, station wagons, or convertibles.
Minimum weight with driver:
321 cubic inch or less must weigh 3,400 pounds.
322 to 367 cubic inch must weigh 3,600 pounds.
368 cubic inch or more must weigh 3,800 pounds.
4. The minimum weight of the car must be displayed in the upper rear corners of both front fenders in minimum 3 inch numbers.
5. No reinforcing, cutting, welding, or modifications are allowed except as specified herein.
6. Doors may be gutted for door bars (roll cage) only.
7. Front wheel wells only may be removed.
8. All doors must be welded or bolted shut.
9. Body must match frame and wheel base.
10. All glass and burnable material must be removed.
11. All cars must begin each program with a complete body.
12. After market stock appearing poly nose pieces with stock bumper underneath allowed.
13. All cars must have front and rear tow hooks.
14. A short piece of 3/8 chain must be bolted through a hole in the bumper and a hole in the frame to prevent the bumper from falling off. This applies to both front and rear bumpers. Straps from front bumper to fender are allowed and recommended.
15. No enclosed cockpits..
1. A 4 or 6 point roll cage is mandatory. Main cage must consist of 1.75 inch O.D. tubing, with a wall thickness of at least .095 inch
2. All cars must have one (1) post by each windshield post and two (2) behind the driver with all four (4) connected at the top with a roof hoop.
3. Front engine hoops allowed.
4. All cars must have angle bar from the driver’s front of the roof hoop to the right rear of the roof hoop.
5. All cars must have a minimum of three (3) door bars on driver’s side. Must be 1.75 inch O.D. tubing, with a wall thickness of at least .095 inch.
SAFETY, BELTS and SEATS.
1. Each driver must have a fire extinguisher in the pits.
2. Aluminum racing seats ONLY.
3. A tail-light in the rear window is required.
4. Seat belts must consist of a three (3) inch lap belt and double two (2) inch shoulder belts that release with one (1) mechanism. All belts must be replaced five years after manufacturing date.
5. All seat belt mounting points must be secure and made of metal using a minimum of one-half (½) inch Grade 8 bolts. Shoulder belts should be mounted six (6) inches lower than the driver’s shoulders.
6. Seat belts must be secured to seat frame and/or roll cage or car frame.
7. A driver’s side window net or arm restraints are mandatory.
8. Windshield screener bars a minimum of four and three-eighths (4 3/8) inch, or a protective screen is mandatory.
9. Full face SA 2000 approved helmets only or newer.
10. SFI approved driving suit, neck brace, shoes, and racing gloves are mandatory.
1. Stock cast iron intake and exhaust manifolds required. Only two barrel intake manifolds are allowed. Exhaust must exit underneath car. No center dump exhaust manifolds on Chevrolets. No aluminum intakes.
3. No porting or grinding of casing numbers.
4. No headers.
5. Any hydraulic camshaft. No roller cams.
6. Valve springs can be any weight but must stock diameter and no dual springs..
7. Screw-in studs for rocker arms, if stud mount is not machined are acceptable. May also be pinned. NO ROLLER ROCKER ARMS.
8. Cylinder heads must match engine. No inter-marriage allowed.
9. Chevy 350 or 400 cubic inch engine must run a minimum of 74 cc head. Must be stock production, no angle milling but flat milling acceptable. Head must be a minimum of 70 cc after clean up.
10. Ignition must be stock point or electronic system. NO MSD boxes or super coils.
11. Any cast or hypereutectic pistons allowed, not to exceed 9.5 to 1 compression ratio. Piston must be below deck. No gas port pistons.
12. Solid motor mounts acceptable as long as in stock location.
CARBUREATORS AND FUEL
1. One 2-barrel carburetor only. Recommend the Rochester two barrel carburetor. Limit of one 1 3/8 carburetor spacer or adapter, including gaskets, measured between the intake manifold and carburetor base. No sliders. No fuel injection.
2. Two barrel intake manifolds required.
3. No front bowl Holley carburetors.
4. No electric fuel pumps. Mechanical fuel pump (but NOT belt driven) acceptable.
5. Pump gas only.
1. One radiator only.
2. May be aluminum.
3. Must be mounted in stock location.
TRANSMISSION AND REAR ENDS
1. Stock OEM transmission and clutches only.
2. No aluminum flywheels or multi-disc clutches.
3. No stall converters.
4. Posi-traction or welded rear ends are acceptable.
5. Rear end must match model of car. No inter-marriage.
6. Drive shaft must be painted white. Loops must be made of ¼ x 2 steel constructions, located 6 to 12 inches behind front U-joint. NO CHAIN.
1. The battery may be moved inside the car and must be covered and securely fastened. No tarp straps.
2. No 16-volt batteries.
BRAKES, STEERING and SUSPENSION
1. Factory stock brakes including master cylinder.
2. All cars must have 4 working brakes at all times.
3. No altering of suspension or steering.
4. Quick release steering wheels allowed.
5. Stock-type springs, torsion bars, and shocks only. No racing shocks. No spring spacers.
1. Fuel tanks may be moved to trunk area but must have a firewall between driver and fuel tank.
2. Fuel tanks must be mounted using a minimum of two 2 steel straps.
3. Fuel cells are optional but highly recommended.
TIRES and WHEELS.
1. Any steel wheel up to a maximum of 8 wide.
2. Tires must be DOT street tires. No recaps. Maximum of each series tires is: 255-R60. 255-R65, and 255-R70. No grooving or siping.
IMCA G-60, WISSOTA H-40 or WISSOTA 35 tires will be allowed. No defacing of tires. The same tire types and compounds must be run on all 4 corners of the car. No mixing of tires will be allowed. Grooving, grinding or siping allowed, NO SOFTENING.
3. No grips or racing tires of any kinds.
4. No wheel spacers.
5. Minimum of 1 lug nuts with white spoke rim or racing rim. Strongly recommended 5/8 studs.
LETTERING and NUMBERING.
1. Cars must be neatly numbered using numbers from 1 to 99.
2. Numbers must be at least 15 high x 10 wide with a body of 3 must be painted or stickered both sides of the car and roof.
3. A 6 x 6 plate with number must be placed on the front and rear windows.
4. Numbers must be in contrasting color to car.
5. Track may ask for removal of offensive or suggestive lettering or graphics.
TECH INSPECTION BY TRACK.
1. Protest Rule: Only a driver of a car within the same class can protest to have another car torn down. The request must be made to the pit steward and paid for prior to the start of the feature race.
2. Tear down costs $100 top end (car, intake, and one head) and $100 bottom end (pull oil pan) or $200 for both.
3. Top 5 places in feature to draw chip after crossing scale. Odd color chip drawee subject to tech inspection by track. Car to remain unaltered by south end of scale.
Immediately following the completion of the feature race, a track official will notify the driver of the relevant race car that his/her race car has been protested. The protested
driver shall then proceed directly to the claim area where he will receive further instructions as to where the tear down will take place. A track official will be assigned to stay with the protested car until the tear down is completed.
Only the driver may protest. A driver may only protest one engine per race. Only the tech inspector has the final word on the legality of the race cars involved in the protest. No person shall prevent or interfere with the protest procedure. Only the driver and 2 pitmen from the protested car, the protesting driver and 1 of his/her pitmen and the appropriate track officials may be present at the tear down.
If an engine is found to be illegal, the driver of the protested car will forfeit all points and money earned for the event at which the engine was protested and will serve a 2-event suspension. The 2-event suspension applies to both car and driver. Refusal of a protest will result in the same penalties as above. In the case of a protest refusal, the protest fee will be returned to the driver who protested. A second protest refusal by the same driver in the same racing season shall result in loss of all points and money earned for the event at which the engine was protested, a 4-event suspension for both car and driver and loss of all points earned year to date.