Texoma Motor Speedway

2008 Pure Stock Rules

Driver:

1. Minimum age is 14 years old unless approved by track official.

Chassis:

1. Rear wheel drive cars, maximum of 103-inch wheelbase.
2. Two or four door sedan, compact pickup or station wagon body with steel top allowed. (The following cars are not allowed: two seat sport cars, convertibles, Mau'la Rotaries, Volkswagen bugs).
3. No rear or mid engine cars.
4. Wheelbase must remain factory stock on both side of car.

Body:

1. Frame and body must be absolutely stock for make, model, and year of car or you may have Dirt wedge mod late model or Late model body style.
2. Plastic racing noses and tails allowed.
3. No tube frame cars allowed.
4. No modifications or cutting allowed to firewall. All cars must have a complete firewall-separating engine from driver and complete firewall separating driver from fuel cell.
5. All interior glass, chrome, door handles, lights, trim, and anything else that may come loose on impact must be removed.
6. All doors must be welded or bolted shut.
7. Fenders may be cut for tire clearance. No internal reinforcing allowed, rub rail on side of body is allowed, it must touch body for the entire length of rail and be no larger than 1 ½” OD round or square.
8. All cars must have a minimum of two hood pins. Hood must be flush with firewall.
9. Hole for air cleaner is allowed (maximum 14"). Hood and trunk may be gutted.
10. No other gutting or cutting allowed, except front fender wells may be removed for roll cage installation only.

Weight:

1. The minimum weight after a race including driver, must be 2,200 pounds.
2. Add on weight must be securely bolted or welded and painted white with car # on them. 

Suspension:

1. Must be stock type.
2. No welding springs solid or using wood blocks in springs.
3. No solid suspension allowed. Shocks must remain in stock location.
4. After market springs and shocks are allowed.
5. No aluminum shocks.

Steering:

1. Stock steering box must be in original stock location.
2. No center steering.
3. Driver seat must be on left side of drive shaft hump.
4. No modifications of hump allowed. Chain steering or box reduction is allowed.
5. Quick release steering wheel is permitted.

Engine:

1. Must have been produced for consumer use in that make of car (GM in GM, Ford in Ford, Etc.)
2. Engine size must be inline four cylinders with maximum displacement of 155 cubic inches or 2450 CC.
3. Ford powered cars maximum 140 cubic inches.
4. Milling of heads to increase compression is permitted.
5. No angle milling or milling past intake bolt threads allowed.
6. No porting or polishing of heads allowed. No port matching.
7. Any flat tappet cam, valve spring, rocker and lifters are allowed.
8. No oversized valves, only two per cylinder allowed. Any flat top pistons permitted.
9. Bore size allowed Stock plus .060 plus .010 for wear.
10. Engine must have 15 inches of vacuum at 1200 RPM hot.
11. O.E.M. crankshaft and O.E.M. stock connecting rods and rod lengths.
12. Stock stroke only.
13. No modifications other than standard engine balancing allowed.
14. After market oil pans allowed. OIL pans must have a 1” inspection sight hole for visual rod inspection.
15. Stock cast iron exhaust manifolds with exhaust pipe directing spent gasses under the car.
16. Mufflers are mandatory and must keep the car at 95 decibels or less. No supper trapps.
17. Engine location must remain in original position.
18. Solid motor mounts allowed. All O.E.M. parts must bolt on without modifications.
19. No Ford SVO, Nissan Motor Sports, ect. parts allowed. Manufacturer number must be clearly visible for inspection.

Carburetor:

1. One two-barrel carburetor only.
2. 500 CFM maximum with maximum venturi size of 1-3/8" and maximum butterfly size of 1-11/16".
3. Carburetor with venturi size larger than 1-3/8 must run restrictor plate restricted down to 1-3/8".
4. If electric fuel pump is used, an automatic oil pressure cut off switch is required.
5. Battery type ignition in stock location, only.
6. No magnetos, dual point, MSD type boxes or any other after market electronic ignition not allowed.
7. GM ignition modules allowed on ford powered cars.

Brakes:

1. Must have O.E.M. hubs and brakes with a minimum of three wheel brakes in working order.
2. Four-wheel brakes are recommended. No after market pedals- master cylinders etc.

Wheels:

1. 13", 14", and 15" wheels maximum 8" wide steel wheels only.
2. Wheels may be reinforced. Big lug nuts may be used.
3. No aluminum wheels allowed. Purpose of 8" is to allow IMCA wheels. (They are available cheap ask around)

Tires:

1. Street DOT tires only.
2. Maximum size 235 75, 235 70, 235 60 or IMCA tire.

Roll Cage:

1. Must consist of continuous hoops not less than 1.666 inches outside diameter with wall thickness of at least .095 inch. Low carbon, mild steel tubing is recommended.
2. Must be frame mounted in at least 6 places. No brazing or soldering allowed.
3. Must consist of a configuration of front and rear hoops connected by tubing on the sides or side hoops.
4. Driver's head must not protrude out side of cage with helmet on and strapped in drivers seat.
5. Must have minimum of one cross bar in top halo of roll cage.
6. Roll cage must be securely supported and braced.
7. Protection of feet is mandatory bar across back of engine with vertical bars and rub rails, or similar protection.
8. No brace bars forward of cage may be higher the stock hood height. Main cage no further than engine plate.
9. Fire Extinguisher required and must be mounted within easy reach of strapped in driver.
10. Driver must be able to remove extinguisher. Quick release bracket is mandatory.

Door Bars:

1. Minimum of four driver side door bars, at least 1.5 inch O.D.
2. Must be as parallel with the ground as possible, and located perpendicular to the driver so provide maximum protection for the driver, but without causing undue difficulty in getting into and out of the vehicle.
3. The sidebars must be welded to the front and rear cage members.
4. Must have at least three cross door bars minimum 1.25 inch O.D., on passenger side of car, either horizontal or angled. (Steel doorplates welded to door bars will be required on driver's side. 18-gauge or .049-inch minimum thickness metal).

Rear End:

1. Any O.E.M. stock rear end. Locked rear end O.K.

Transmission:

2. O.E.M. standard or automatic transmission: Automatic must have torque converter.
3. All cars must have clutch scatter shield or blanket 6"width and 12" length.
4. Scatter shield may be fabricated from '/a" minimum steel and secured to the floor cover clutch area.
5. Transmissions must have all working forward and one reverse gear.
6. No dog clutches or mini disc clutches allowed.
7. Front wheel drive permitted. O.E.M. flywheel only, must use stock diameter clutch and stock diameter steel pressure plate.
8. If transmission cooler is used, it must be mounted in engine compartment.

Bumpers and Nerf Bars:

1. Stock front and rear bumpers only.
2. Stock bumper may be backed up with pipe and looped back into the frame.
3. Front bumper must be line (center) in original location.
4. Bumper must not extend any farther forward than 2" in front of any front body part.
5. End must bend back into the frame and be rounded (no blunt end or sharp edges). Tow loops front and rear required. Single loop radiator brace can be installed, but must be placed just in front of radiator.
6. Radiator must be in stock location. Nerf bars are optional, but if used, they must be flush against the body.
7. Maximum pipe or tubing size is 1-1/2" O.D. Ends must be bent into the body. No blunt or sharp edges.
8. Nerf bars must be located between the wheels and between the rear tire and bumper.
9. Must be connected to bumper to prevent cars from being hooking bumpers.

Fuel Cell:

1. Racing fuel cells required and must be mounted by at least two solid straps, two inches wide around cell.
2. Fuel cells are limited to 16 gallons maximum capacity.
3. Pickup must be underneath fuel cell. A limit of one standard fuel filter allowed between fuel cell and carburetor.
4. Fuel Cell must be relocated a safe distance from the driver in the trunk department with a firewall between fuel cell and driver.
5. Firewalls must be steel and constructed where flames cannot enter the drivers compartment, under or over firewall.
6. Trunk floor may not be removed and must have holes for ventilation and drainage.
7. If fuel lines pass through drivers compartment they must be conduit.

Fuel:

1. Gasoline only, no performance enhancing additives.

Radiator:

1. Only one radiator allowed, and it must be mounted in a vertical position in front of motor.

2. An electric fan is allowed.
3. Fan shrouds must be approved by tech official. 

Battery:

1. Battery must be securely mounted.
2. If mounted in drivers compartment, battery must be in a battery box.
3. The battery must be in good working condition and capable of starting the car.

Interior:

1. May be boxed or tubed in.

Car Numbers:

2. Car Numbers must be 2" wide and 24" tall.

Rule Disclaimer: The rules and or regulations set forth herein are designed for the orderly conduct of racing events and to establish minimum acceptable requirements for such events. The rules shall govern all entrants. NO EXPRESS 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 deviations from any of the specifications, herein, or impose any further restriction, that in his 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 deviations of these rules is left to the discretion of the officials. Their discretion is final.

January 1, 2008

Texoma Motor Speedway

Wichita Falls, Texas