2023 M40 Street Stock Rules

2023 STREET STOCK RULES
SAFETY:
1. All vehicles must have a minimum of a 4-post roll cage with at least 3 bars at the driver’s door and a welded or bolted steel plate of 1/8” x 18” x 30” at the driver’s door.
2. A full 5-point restraint system is required and in good shape.
3. Window nets must be always used during participation and in good shape.
4. Neck collars or HANS type devices are required for all participants and in good shape.
5. A minimum 2 1/2” lb. fire extinguisher is required to be securely mounted within the driver’s reach.
6. All Cars must have shut off switch next to the driver’s window which can easily be reached from the outside of the car.
7. Raceceiver type communication devices required for all classes.                                         
Base Weight minimum weight of car and helmeted driver is 3100 lb with a maximum of  60% left side weight
CHASSIS:
1. Full stock frame pocket to pocket, Camaros may tie frames together. Fabricated frames permitted as long as they have stock oem front lower A arms, OEM steering box (no rack and pinion) and meet all other rules !
2. Minimum wheelbase is 102”.
3. Minimum frame ground clearance of 4” with driver in the vehicle. BEFORE QUALIFYING AND POST RACE.
4. Maximum track width of 78”. Measured with toe boards anywhere on wheels.
5. Suspension Underslung Sway Bars permitted.

6. GM 10 or 12 bolt and ford 9” rear ends are permissible but must have steel axle tubes.
7. 4 corner jack bolts are allowed.
8. Adjustable Heim Joints are permitted on Rear Trailing Arms.
9. OEM  lower control arm required  AFTERMARKET UPPER A-ARMS ARE PERMITTED WITH NON-ADJUSTABLE BALL JOINTS! AFTERMARKET, STOCK APPEARING SPINDLES ARE ALSO PERMITTED.
10. Minimum Spring diameter is 5”. Leaf spring rears permitted
11. Stock Steering box and conventional steering components only. Heims joint tie-rods ok
12. Shocks must be steel, non-adjustable style shocks and nationally advertised.
13. NO BUMP STOPS OR COIL BINDING WILL BE PERMITTED!
14. FOUR WHEEL DISC BRAKES ARE PERMITTED. CALIPERS MUST BE SINGLE PISTON STEEL OR ALUMINUM.
15. ALL 4 BRAKES MUST BE OPERATIONAL! IN COCKPIT BRAKE BIAS ADJUSTERS ARE PERMITTED.
16. Fuel Cell must be mounted above the rear end centerline with a minimum of 8” ground clearance.
17. Aftermarket gas pedal and brake pedals are permissible.
18. TRACTION CONTROL DEVICES OF ANY KIND ARE STRICTLY PROHIBITED!
BODY:
1. Rear wheel drive cars and trucks only, trucks must have bed covered. No front wheel or 4-wheel drive vehicles are permitted.
2. Stock appearing bodies w/front nose cover set vertically correct to stock, Rear must be enclosed. Cowl hoods may be used but air filters may not come through any hood. Minimum Roof Height of 47”. MEASURED AT ANY POINT!
3. Maximum Rear Deck Height 37"
4. Hood and trunk must be operable and held down with 4 quick release hood type pins.
5. Full front Lexan windshields required. No partial windshields will be allowed.
6. Rear spoilers are allowed with a maximum size of 6 1/2” x 60”. Spoilers must be clear, centered and mounted flat. MAXIMUM SPOILER HEIGHT FROM GROUND OF 42. FORWARD FACE OF SPOILER MUST BE FLAT.
7. Nerf bars (RUB RAILS) must be no larger than 1” in diameter and smoothly capped. A minimum of 4 smooth head bolts must be used for securement. Carriage or equivalent bolts recommended. Bolts must be mounted with the head to the outside of vehicle.
8. Batteries are to be covered and securely fastened behind driver in approved battery boxes. No rubber or plumbing straps allowed.
9. 22-gallon maximum capacity fuels cells are required. Must be a minimum of 8” from ground.
10. Floorboard under driver must be stock or constructed of 1/8” minimum thickness steel.       
11. Interior may be boxed in from drive shaft tunnel to the right side window opening and from behind the driver to the rear window deck
12. Racing type seats are mandatory. NO FIBERGLASS SEATS!
13. NO MIRRORS OR RADIOS!

ENGINE AND TRANSMISSION:
1. Any domestic stock appearing engines will be permitted.
2. Engine block and heads must remain cast iron.
3. Aluminum intakes are permitted.
4. 2- or 4-barrel carburetors are permitted. NO FUEL INJECTION!
5. Fuel pumps must be mechanical. NO ELECTRIC FUEL PUMPS!
6. No dry sump oil systems permitted.
7. Maximum engine setback is 2”. MEASURED FROM THE #1 SPARK PLUG TO THE BALL JOINT CENTERLINE!
8. Stock HEI or MSD ignitions are permitted. MSD box must be out of drivers reach.
9. Radiators must remain completely underneath hood and not protrude through hood. NO ANTIFREEZE!
10. Headers or exhaust manifolds are permitted.
11. Exhaust must exit either behind rear of door when run below the floorboard or on the passenger’s side door towards the rear.
12. Transmissions: Automatic with 10.5” convertor or manual with 11” or mini clutch are permitted.
13. Aluminum flywheels are permitted.
14. Direct drive or aftermarket transmissions are prohibited.
15. Transmission coolers in cockpit are prohibited.
16. Driveshaft safety loops are mandatory.

TIRES AND WHEELS:
1. Hoosier Comanches, 790s, or 800 tires only. * Hoosier Tires are subject to change based on availability.
2. 8” wide maximum diameter safety wheels only.
3. Tires and wheels must remain inside body.

ALL RULES INTERPRETATIONS AND RULINGS ARE AT THE DISCRETION OF THE TECHNICAL DIRECTOR AND ARE FINAL! ALL ADDITIONAL WEIGHT MUST BE PAINTED WHITE AND HAVE YOUR VEHICLE NUMBER ON IT. WEIGHTS MUST BE FASTENED WITH A MINIMUM OF 1/2” THREADED STEEL ROD AND NOT PROTRUDE BELOW THE FRAME. CARS MUST CONFORM TO THE RULES AND BE LEGAL FOR EVERY EVENT! THERE WILL NO LONGER BE ANY 1 WEEK GRACE PERIODS!