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, must add 50 pounds in front of
bell housing (bringing the total weight to 3050). 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.
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.
1 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. Cars with aluminum aftermarket bodies must weigh 3,050 lbs,
with the additional 50 lbs in front of bell housing. 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
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 to side.
750 CFM maximum. Single pump, dual line, vacuum secondary carburetor
only. Must pass track go/no go gauge. Choke may be removed but choke
horn must remain. 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
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 pulleys
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. No wheel adapters allowed.
Bead locks permitted on all 4 wheels.
Hoosier RC3 or RC 4
Must punch 47 before qualifying and before feature
RC 3's & 4 can be bought at HOOSIER SOUTH for $105 per tire
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.