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2014 Tazewell Speedway Modified Street Rules 
 

Eligible Models
Any factory U.S. Production models made in 1965 or after. No trucks, station wagons or convertibles. Minimum wheel base for any car is 107 inches. Tube frames will NOT be allowed. The car must be full stock frame. Rear clip from center of rear end housing back may be replaced with 2x3.125 tubing. Uni-body cars may tie the front clip to the rear clip. The rear-clip may be reinforced with round or box steel tubing (2x3 recommended). The following are the only changes permitted, everything else must remain stock.

Bodies
All glass, head lights, exterior lights and trim must be removed. Front and rear wheel openings may be trimmed for tire clearance. No sharp edges. Steel aftermarket stock appearing bodies allowed. Roof may be fiberglass, must be stock appearing. Stock or aftermarket, no homemade tops. Hood may be fiberglass or aluminum.
Aluminum after market bodies allowed. All bodies must weigh 3,000 lbs. Aluminum bodies must be stock appearing and must be approved by track officials. Must retain stock firewall and floor pan in stock location. Floor pan must extend to the rear seat area and be reinforced with steel plate. C Post must be the same dimensions as stocks for make and model. No late model style sail panels allowed. (Example: 85 Monte Carlo c post must look like an 85 Monte Carlo). A 5 inch tall spoiler is allowed, 3 spoiler braces allowed, 8 inch high and 12 inch long maximum. Plastic nose and tail permitted. Must be stock appearing. (Example Monte Carlo must look like Monte Carlo. Camaro must look like Camaro). Tail piece is required. Steel tube front and rear bumpers may replace stock bumpers. Front bumper may be made of maximum 1 ½ o.d. X .125 thickness or 1 ¾ o.d. X .095 thickness tubing. Rear may be a maximum of 2 x 3 o.d. X .125 thickness rectangular tubing. All body parts must be in place to start the race. Track discretion if you are involved in an accident.

Roll Cage
ALL CARS MUST HAVE SIX (6) POINT ROLL CAGE. Roll bar material must be minimum of 1 ½ inch o.d. tubing by .095 thickness. It is recommended that welded joints have a gusset of minimum 1/8” thick steel. No conduit, thin-wall tubing or cast-iron pipe fittings will be permitted. All roll bar installations are subject to approval by the Technical Inspector. Door bars are mandatory and must extend into the door panels. A minimum of 3 door bars with 6 vertical studs equally spaced are required on driver side. Right side X is permitted. All bars within reasonable reach of the driver must be padded. Side wing bars are mandatory on both sides of the roll cage, and must extend downward at 90 degrees from the apex of upper forward roll bar bend, to top of the side door bar. The side wing bars must be the same material as the roll cage. (Minimum of

1 ½ x .095). One or more bars are required from left front upright of roll cage to the frame for foot protection.

Weight Requirements
Car must weigh 3,000 lbs (with driver) before qualifying and before the race. Any car not meeting the minimum weight requirement prior to qualifying will not qualify. Any cars that fails the weight requirement before the race will add the weight and start in the rear. All weight added to the car must be securely mounted with a minimum of two 3/8 grade 8 bolts. It must be painted white and the car number must be visible. Any weight dropped on the racing surface will result in immediate disqualification. Weight must be posted on the right side A pillar.

Engine Restrictions
Engine must be stock production. Engines may be interchanged within corporate manufacture lines. (i.e. any GM motor into GM car) Maximum cubic inch for any GM engine is 362.5, Ford 362, Chrysler 372. No V-6 engines allowed.

Engine Block
O.E.M cast iron, may be 2 or 4 bolt main. Aftermarket main caps allowed. Engine must remain in stock location, 1 inch tolerance.

Cylinder Heads
Any steel aftermarket 23 degree straight plug allowed. Intake runners can be no bigger than 185cc's. No cc limit on combustion chamber. Maximum valve size for GM is 2.02/1.60, Ford 2.04/1.65, Chrysler 2.02/1.62. May be angle milled not to exceed 2 degrees. Multi angle valve job permitted. Stainless steel valves permitted, no titanium valve permitted. No aluminum heads permitted, no angle plug heads, no porting, no polishing, gasket matching or grinding allowed.

Crankshafts, Rods & Pistons
Stock or aftermarket crankshafts allowed. Must be of stock stroke and weight. (i.e. GM 350 = 3.480 stroke), cast 48 lbs, steel 50 lbs. May be balanced. Any aftermarket steel rods permitted. No aluminum or titanium rods allowed. Cast or forged pistons, flat top only. Zero deck (piston cannot come out of the hole). No tolerance.

Timing Components/ Rocker Arms
Any high performance camshaft allowed, except no roller or mushroom camshafts. Stock type solid or stock type hydraulic lifters only. Stock diameter only. No roller or mushroom lifters permitted. Dual roller timing chain or gear drive permitted. Long slot or roller rockers allowed. Rocker arm studs may be pinned or screw in studs. Guide plates, poly locks and stud girdles allowed. Shaft mounted rockers not permitted. Valve springs and retainers, optional.

Oil Pump/ Pan/ Valve Covers
Stock or aftermarket permitted, wet sump only.

Intake Manifolds
Cast iron or aluminum intake manifold only. All intake manifolds must be untouched as originally manufactured by the factory. Any manifold that is determined to be modified will be subject to disqualification. No homemade intake manifolds allowed.

Exhaust
Headers allowed. No turn downs. Must run parallel to the ground, may run side to side.

Carburetor/ Air Cleaner
Any 750 cfm maximum permitted. Maximum venturi allowed. Front 1 3/8.
Rear 1 7/16. Must pass track go/no go gauge. No alterations to venturi. Two inch maximum adapter plate permitted. .025 tolerance. One gasket per surface, .070 maximum on gaskets. Mechanical throttle linkage must have toe strap. A minimum of 2 return springs required on carburetor. Any type of air cleaner permitted. No air boxes and no funneling devices.

Fuel and Fuel Cell
Pump and racing fuel allowed,(no additives). E85 gasoline will be allowed, the specific gravity may not exceed .750 No methanol or alcohol or nitrous oxide allowed. A fuel cell is required. The pickup must be located on the top of the fuel cell. Maximum capacity cannot exceed 22 gallons. Fuel cells must be contained in a completely enclosed 18 gauge steel container. No aluminum fuel cells are allowed. All fuel cells must be vented and have a screw type cap. Must have a coiled tube to prevent the leaking of fuel in the event of a roll over. Vent check valves are optional but the loop is mandatory. Cell may not hang lower than the rear end housing and must have a cell guard minimum 1 1/2” tube to bottom of cell. Gas cap may not extend through body. When plumbing any fuel related item, DO NOT USE PLUMBERS TAPE. Fuel pump must be mechanical, mounted in stock location. No electric fuel pumps or pressurized tank systems of any type permitted. Fuel injection or super chargers not permitted. Easily accessible fuel shut off valve is recommended on the right side of the driver.

Ignition and Battery
Any distributor allowed. No ignition control boxes (MSD, Mallory, etc.) No crank triggered ignition, magnetos or computers. Rev limiters permitted. Only 1 battery may be used. Automotive or marine battery permitted. Battery may be mounted in trunk area. All batteries must be securely mounted with angle iron frame on top and bottom. Batteries mounted in drivers compartment must have complete rubber covering. No plastic battery boxes permitted.

Starter
Aftermarket replacement or mini starter ok. Starters must mount in stock location on block. No reverse or bell housing starters allowed.

Water Pump/Radiator
May use aftermarket aluminum water pump. Aftermarket aluminum radiator and fan shroud permitted. Must have catch tank on radiator overflow, minimum 2 quarts. Any car leaking water on track will be black flagged.

Power Steering Pump/Pulleys
Aftermarket block-mounted power steering pumps allowed. External reservoir permitted. Steering may be quickened. Any steel or aluminum pulleys permitted.

Clutch/Flywheel
Any

Transmissions
Stock type OEM manual or automatic transmissions only. Must have forward and reverse. Converter-less automatics ok. No bert or brinn transmissions or direct drive allowed. All vehicles must have operational reverse gear and be able to shift from forward to reverse with engine running. Transmission oil coolers, if used, must be securely mounted outside drivers compartment. It is recommended that manual transmissions have a SEMA/NASCAR approved steel bell housing or scatter shield and automatics use a blanket or approved scatter shield.

Driveline and Brakes
Nine inch Ford allowed. Floater rear ends and aftermarkets high strength axles are ok and are recommended. Any gear, full spool, mini spools, or welded spider gears allowed. Minimum 5/8 wheel studs mandatory. No quick change. Detroit locker or gold track units allowed. No wide five hubs. Driveline must be steel only and painted white. 2 drive line hoops required, front and rear. Material should be 1/4” thick and 2” wide. May use any type of brakes.

Steering and Suspension
OEM steering box only. No racks. Center link and tie rods may be fabricated. Tubular upper A frame allowed. Bite bolts allowed. Racing shocks permitted but must be steel bodied and non adjustable. Shocks may be relocated. Any rear suspension allowed, no bird cages. Aftermarket springs may be used. Leaf spring cars may use stock type aftermarket leaf springs. No single leaf or fiberglass leaf springs allowed. Leaf springs must mount in stock location in front, lowering blocks and sliders permitted.

Wheels
Any US manufactured steel wheel permitted. 10” maximum width bead to bead. No light weight or aluminum wheels allowed. Center of wheel must be of heavy duty construction. Wheel offset is optional. One wheel space allowed per wheel, max of 1/2” thick. Fve wide adapter allowed. Bead locks permitted on all 4 wheels.

Radios and Mirrors
No type of radio or any other two-way communication with the driver will be permitted. Mirrors are not permitted.

Track reserves the right to delete, change or amend rules in the interest of competition at any time.

Tires
Hoosier RC 3 and RC 4 allowed
Any other tire must punch 58 both rears