STREET STOCK RULES
(Any visiting cars that don't comply with NFS track rules will be
required to add weight)
BODY: Any 1970 thru 1995 production sedan, completely stock except
for the following options:
Must have full stock firewall or replacement firewall of equal or
thicker steel must be magnetic steel, FULL FIREWALL!!
Must have floor board to rear of driver's seat.
May close in driver compartment, Must have a 12 inch inspection
hole on passengers side of deck.
Fender wells may be cut for tire clearance.
Bodies may be hulled.
Removal of dash permitted.
Uni body may be tied together with 6 inch overlap of existing stock
Trunk must be sealed from driver's compartment.
No sharp edges.
No lowering of roofs or bodies.
Driver's seat must be in stock OEM location, No seats sitting on
or close to wheel tub.
May run rear spoiler maximum 6 inch X 60 inch, no side spoiler.
May run aftermarket nose piece must match body.
Minimum 6 inch frame height.
May run outside door rub bars not to exceed 1 inch in diameter,
must angle ends in ward, don't abuse this rule as it can change.
Must have bars in front of driver minimum of 4.
May run after market body may be steel or aluminum, roof and hood
may be steel Aluminum, or fiberglass, may use performance bodies
part # PBO18X001 for Camero, check with the track as to what other
bodies will be allowed in this class.
Wheel base: Minimum 101 inch, wheel base must match body style,
no shortened full size frames on metric bodies, notching frame for
fuel pump safety clearance only.
Weight: 3000lbs after race with driver.
4. Chassis: Must remain completely stock , except for the following
options, may relocate top A-frames, may use tubular upper control
arm (must be stock length for chassis being used) racing springs
allowed, coil for coil leaf for leaf, sliders allowed on rear leaf
spring cars, lowering blocks allowed, wedge bolts allowed on coil
spring cars rear only, shocks any welded steel shock, split valve
ok, rebuildable ok, may run extension on left rear only, may run
outboard shock on front only, Under slung rear chassis OK. Must
retain stock trailing arms, NO swedge tubes or hiem joints, NO J-bars,
NO Pan hard or tracking bars.
Sway bars: any sway bar not to exceed 1 ¼ inch in diameter,
must be mounted in the factory frame horn mounts may be polyurethane,
ends must be mounted in the stock type end links, may be polyurethane,
No adjustable sway bar end links.
All chassis must be metric for metric and chevelle for chevelle
NO cutting down full size chassis to fit metric body.
Engine: Must be for make and model of chassis, engine must sit in
OEM factory stock location, NO set back motors!!! MUST RUN MUFFLERS!
Heads: RHS Heads, world product #4360 or #4361, Pro top line #2237694167T
or 2236794176T, old double hump heads (with 1.94/1.50 valves) factory
stock heads, OPEN CHAMBER only.
EXCEPT FOR THE ABOVE APPROVED HEADS, 194/150 valves only NO 2.02,
No vortec, milling of heads OK, 3 angle valve job OK, no pocket
blending, NO porting, NO gasket matching or any grinding on head
except to deck surface or cut valve seats
No swirl cut valves, No under cut valves, Valves must be stock length
i.e 11/32 diameter. No angle milling of heads.
OPTIONS: valve covers, windage tray, cam button, air filter, oil
pan, four bolt blocks OK, aluminum pulleys, pushrods, stud girdle,
Polly Locks, timing chain and gear (NO gear drive or belt drive),
rod bolts, blueprint and balancing OK.
Valve train: any hydraulic flat tappet cam, anti pump up lifters
OK, aftermarket pushrods OK, 1.250 maximum diameter valve springs,
screw in studs OK. Polylocks OK, stud girdle OK, 1.50 or 1.52 stock
OEM or 1.5 aluminum roller rockers optional.
Pistons: 2 eyebrow cast or forged (must have factory stock pin height),
at no point can piston protrude above block deck, floated pin OK.
Rods: any steel I-beam rod, must be factory stock length for make
of engine being used, no 6 inch rods in Chevy 350 etc. floating
pin OK, after market rod bolts OK. NO H-Beams!
Crankshaft: any steel or forged factory stock or aftermarket crankshaft
OK, no knife edge, No lightened cranks, balancing OK, Minimum weight
48lbsNO TOLERANCE. No cross drilling of crankshaft.
Exhaust: headers OK, must run parallel to ground. Must have mufflers.
Over rail headers ok.
Carburetor: may run any Q-jet, 4412 Holley, 1850 Holley single line,
vac. Secondary, max. carb adapter not to exceed 1 ½ including
gaskets, may run center hug float bowls, may not run secondary metering
block, may run rear jet plate, may run fuel log. No carb hats or
cold air boxes, removal of choke butterfly and shaft OK, changing
of jets OK, changing of power valve OK, No other modifications will
be allowed, No electric fuel pumps.
Ignition: Factory stock hei or you may use aftermarket hei dist.
Must be stock appearing, No small MSD dist. Or MSD boxes, super
Clutch: any factory stock OEM or factory stock replacement, (No
finger disc), 10.5 min diameter, any finger or diaphragm pressure
plate, Z28 flywheel OK. STEEL BELLHOUSING IS MANDATORY IN THIS CLASS!!!!
40lbs minimum for clutch, pressure plate, and flywheel.
Brakes: Must have stock type brakes, NO right front shut off, may
run aftermarket pedal and master cylinder assemblies (No bias adjusters
or racing calipers allowed) Must be steel.
Radiator: any radiator in stock location.
Transmission: any factory stock transmission, must have all gears
working, does not have to have linkage hooked up. Automatics must
run full size torque converter. No torque converter eliminators
Driveshaft: steel only, must be painted white. Must have safety
Rear end: interchanging of rear ends, gear ratios, must be fully
locked at all times. No quick changes, no ratchet assemblies, No
aluminum tubes, 9 inch floater Ok strut cars factory torque arm
only it must be mounted solid and non adjustable No J-bars, only
factory style track bar will be allowed. May slot upper trailing
arm or shorten stock upper trailing arms a max. of ¾ of and
inch to set rear pinion angle.
Wheels and Tires: 8 inch steel wheels only, tires 8 inch wide, must
be track approved, optional 10 inch right front steel wheel and
tire, tire must be track approved, minimum ½ inch stud and
nuts required for safety, 5/8 inch preferred.
Fuel cell: MANDATORY, must pass safety tech. racing gas OK.
Safety regulations: all cars and drivers must meet and pass all
NFS safety regulations, modifications to wheel bearings for safety
Ok, must be track approved.