2018
Pure Street Rules
(Updated 1-8-18)
Eligible Models
Open to passenger automobiles and pick up trucks (no station wagons,
convertibles or t-tops) with a minimum wheelbase of 108 inches. Any
year allowed. Absolutely no performance modifications are allowed unless
specified below. In general, anything that improves the performance
of the car over and above its factory capabilities is illegal. Anything
to improve safety is generally permitted.
Bodies
Must be absolutely stock except as modified for safety. Can shell hoods
and deck lids for safety, can replace doors with sheet metal, must be
stock appearing. No cutting of any body parts. Fenders may be cut up
to a maximum of 4" around the tire for clearance. Driver and passenger
doors must be gutted for door bars. Roof may be partially gutted for
cage clearance (only area immediately around main roll bar and halo
bar may be gutted). Front fender wells may be removed. Radiator support
may be removed and bars added for protection. Any repairs to body must
be metal and a maximum of 1/16" thick. All plastic, pot metal,
glass, chrome and rubber exterior moldings, decor, grill, etc. must
be completely removed. In general, anything that may fall off the car
and become debris should be removed. The grill must be replaced with
wire mesh. The stock dash metal must remain. Removal of the back seat
and all excess upholstery is required. All doors must be welded shut.
No gutting of hoods or trunk lids. Trunk and hood must be pinned, hoods
must be secured in such a fashion as to permit easy opening in the event
of fire. Interior gutting of the body to remove excess weight is NOT
permitted. . A five inch tall spoiler is permitted, no sides allowed.
No rub rails. Plastic nose and tail piece permitted. Cars with plastic
nose and tail piece may replace stock bumpers with steel tube front
and rear 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 cars must start the feature with all body parts unless they have
been involved in a accident. Track Discretion.
Roll Cage
ALL CARS MUST HAVE A SIX POINT ROLL CAGE. Roll bar material must be
minimum 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 three door bars with six vertical studs equally spaced
are required on both sides. 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 90E 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 Roll Cage. (minimum 1½
x .095). Uni body cars may tie front clip to rear clip. Complete floor
pan and rocker panels must remain in stock location. Rear clip may be
reinforced with round or box steel tubing (2" x 3" box tubing
recommended). No X frames allowed. One or more bars are required from
left front upright of roll cage to the frame for foot protection.
Weight Requirements
Car must weigh 3,200 pounds (with driver) before the race. Any car 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.
Engine Restrictions
Engine must be stock for make and model ( GM 3.480, Ford 3.500, Chrysler
3.580). Maximum cubic inch for any GM Engine is 362, Ford 363, Chrysler
372. No V-6 engines allowed. Engines may have a maximum bore of .060
over. O.E.M. crankshafts only. Stroke must be stock for make and model.
Rods must be stock length for engine used, O.E.M. stock rods, scat,
or eagle I beam only. Pistons, any flat top. Zero deck (no part of the
piston can come out of the hole). Any hydraulic cam and lifters only.
Maximum cam lift .488. Balancing permitted. Stock engine location must
be maintained. Aftermarket valve covers are allowed. Aftermarket steel
or aluminum pulleys are allowed. Aftermarket fan allowed no electric
fans. Aftermarket air cleaners OK. No funneling or air-flow enhancing
devices allowed. Protest for checking cam is $150. Must pull intake
to check cam.
Cylinder Heads
Any O.E.M. stock cast iron straight plug GM head. World Products replacement
part numbers 4360 or 4267 only. No vortec or aluminum heads permitted,
even if stock. No angle plug heads allowed. Stock valve sizes no bigger
2.020 intake and 1.60 exhaust only. Stock rockers or long slot stock
replacement 1.5 ratio only. No roller rockers or steel rockers with
roller tips will be permitted. Stock diameter valve springs for make
and model. Screw in or pinned studs optional. Heads may be surfaced.
Flat cut only, no angle milling. No porting, polishing, gasket matching
or grinding allowed. Three angle valve job permitted.
Exhaust
Stock manifolds or headers allowed. No turn downs. Must run parallel
to the ground, may run side to side.
Carburetor
500 CFM Two Barrel 4412 Holley Carburetor required. Choke may be removed,
but choke horn must remain and part number must be legible. . No grinding
on butterflies or air horns. No alterations to venturi. Adaptor plates
permitted, 1" maximum. Mechanical throttle linkage must have toe
strap. A minimum of two return springs required on carburetor.
Intake Manifold
Stock cast iron two or four barrel intake manifold. No aluminum or marine
intake manifolds allowed. No grinding, no porting and no gasket matching.
Fuel and Fuel Cell
Pump and racing fuel allowed (no additives). No Methanol, alcohol or
nitrous oxide allowed. A fuel cell is required. The pick up 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 coiled tube to prevent 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 superchargers not permitted. Easily accessible fuel shut-off valve
is recommended on right side of the driver.
E
85 gasoline will be allowed. The specific gravity may not exceed .750
Protest fee will be $25.
Ignition
Stock 12 volt ignition only. One battery may be used, automotive or
marine battery permitted. Battery may be mounted in trunk area. All
batteries must be securely mounted with an angle iron frame on top and
bottom. Batteries mounted in drivers compartment must have a complete
rubber covering. No plastic battery boxes permitted. Electronic ignition
permitted, if stock for make and model. Stock Alternator or generator
optional.
Water Pumps
Stock cast iron water pumps only. No aftermarket aluminum pumps.
Radiator
Aftermarket aluminum radiator and fan shroud permitted. Must have catch
tank on radiator overflow, minimum two quarts. Any car leaking water
on the track will be black flagged.
Steering
A quick release steering wheel may used. Steering quickeners are permitted.
Starter
Stock or aftermarket replacement only. Must mount in stock location
on block. No reverse or bell housing mount starters allowed.
Transmission
Stock type O.E.M. manual or automatic transmissions only. Must have
forward and reverse. Automatics must have OEM torque converter. Transmission
oil coolers, if used, must be securely mounted outside of drivers compartment.
Stock or aftermarket replacement single disc clutch and pressure plates
only. Stock steel flywheel only, no aluminum flywheels permitted.
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
Stock, 9 inch Ford or Floater rear ends allowed, may be locked. Aftermarket
high strength axles okay, and are recommended. Front and rear disc brakes
allowed. Aftermarket brake and clutch pedals allowed. No front to rear
brake bias adjusters allowed. Calipers and drums must be stock. Driveline
must be steel only, and painted white. Two driveline hoops required,
front and rear. Material should be ¼ in thick and 2 inches wide.
Suspension
Racing shocks permitted. Shocks must be steel bodied, non adjustable
and mount in stock location. no bite bolts allowed. Tubular upper A-Frames
allowed. Lower control arms must remain stock. no changes from stock
mounting allowed. May use heavy duty stock style replacement ball joints.
Steering must remain stock, may be heavy duty. Aftermarket springs may
be used, no coil-overs. Springs must be of similar design to original
equipment, and must remain in original position. Stock rear suspension
only. Leaf spring cars may use stock-type aftermarket leaf springs.
no single leaf or fiberglass leaf springs allowed. Leaf springs must
be mounted in stock locations. Lowering blocks allowed.
Wheels And Tires
Any U.S. maufactured steel wheel permitted. 8 inch maximum width bead
to bead. no lightweight or aluminum wheels. Center of wheel must be
heavy duty construction. 5/8 wheel studs mandatory. No wheel adaptors
allowed. Wheel off-set optional. Bead locks permitted on all four wheels.
Regular street tread DOT tires or Hoosier 27.5 medium or or 26.5 medium
compound only, maximum 8 inches wide. no grooving or alterations. No
mud and snow or recap tires permitted.