Tazewell Speedway Modified Street Rules
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.
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). An
8 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.
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
½ x .095). One or more bars are required from left front upright of roll
cage to the frame for foot protection.
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 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.
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.
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.
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.
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.
Pump/ Pan/ Valve Covers
Stock or aftermarket permitted, wet sump only.
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.
Headers allowed. No turn downs. Must run parallel to the ground, may run side
Any 750 cfm maximum permitted. Maximum venturi allowed. Front
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.
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.
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.
Aftermarket replacement or mini starter ok. Starters must mount in stock location
on block. No reverse or bell housing starters allowed.
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.
Aftermarket block-mounted power steering pumps allowed.
External reservoir permitted. Steering may be quickened. Any steel or aluminum
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.
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.
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.
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.
No type of radio or any other two-way communication with the
driver will be permitted. Mirrors are not permitted.
reserves the right to delete, change or amend rules in the interest of competition
at any time.
Hoosier RC 3 and RC 4 allowed
Any other tire must punch 58 both rears