Mike is correct here is the one which I am talking about.
— SECTION 4 —
BFGOODRICH TIRES
STREET STOCK
> Designations
SS preceded by car number.
Designed for full-bodied, street-legal cars with full exhaust and
interior. Valid DOT registration and license plates mandatory. 4-
or 6-cylinder FWD platform only. AWD, RWD prohibited.
Naturally aspirated only. Power adders of any kind prohibited.
> Minimum Weights
4-cylinder, maximum displacement 2.4 liter: 2,350 pounds
6-cylinder, maximum displacement 3.0 liter: 2,650 pounds
All weights include driver, verified after the run.
CLASS REQUIREMENTS
ENGINE:
Engine swaps permitted. OEM engine mounting points mandatory.
Engine must be from same manufacturer as body. Engine must be
overhead-cam, production-based design. Engine must be in stock,
transverse configuration. Single throttle body only. Dry sumps,
vacuum pumps, prohibited.
EXHAUST:
All exhaust must flow through functioning muffler(s); must exit
behind rear tires. Any vehicle that did not come equipped with a
muffler(s) from the factory permitted, provided complete,
unmodified (except for header) OEM exhaust system is utilized.
FUEL:
Pump or racing gasoline only. See General Regulations 1:6.
FUEL SYSTEM:
Fuel cell prohibited. OEM fuel tank mandatory. See Section 4 and
General Regulations 1:5.
25
STREET STOCK
SECTION 4 - BFGOODRICH TIRES STREET STOCK
LIQUID OVERFLOW:
See General Regulations 1:7.
FLYWHEEL SHIELD:
All cars using a clutch and running quicker than 11.49 or faster
than 135 mph must be equipped with a flywheel shield made of
1/4-inch-minimum-thickness steel plate. Shield must surround the
bellhousing completely except for area of flywheel shield adjacent
to differential and axle shaft. Shield may be multi-piece with pieces
bolted together using minimum 3/8-inch-diameter Grade 5 or M10
class 8.8 bolts; may be attached to engine and/or bellhousing. In
lieu of shield, a blanket meeting SFI Spec 4.1, completely
surrounding the bellhousing, is permitted. See General Regulations
2:5, 2:6, 2:9, 2:10.
TRANSMISSION, AUTOMATIC:
Transmission must be OEM for engine used. All cars using an
automatic transmission and running quicker than 10.99 or faster
than 135 mph must be equipped with a transmission shield
meeting SFI Spec 4.1, a flexplate shield labeled as meeting SFI
Spec 30.1, and a flexplate labeled as meeting SFI Spec 29.1.
Transmission brake prohibited.
TRANSMISSION, MANUAL:
Transmission must be OEM for engine used. Automated, timertype,
pneumatic, electric, electronic, hydraulic, etc. shifting
mechanism prohibited; each individual shift must be a function of
the driver and controlled manually. (Driver must pull the lever.)
BRAKES:
Four-wheel hydraulic brakes mandatory. See General Regulations
3:1. Carbon fiber brake rotors prohibited.
STEERING:
Must retain full, original OEM steering gear. See General
Regulations 3:2, 3:3, 4:1.
SUSPENSION, FRONT:
Complete, operative OEM suspension mandatory. Bolt-on traction
devices permitted. Control arms, strut mounting points, etc., must
be OEM, front and rear. Aftermarket springs and struts, including
coil-overs, permitted, but must utilize original OEM mounting
points. Final decision rests with NHRA Technical Services.
SUSPENSION, REAR:
Strut tower braces, lower tie bars, sway bars, and limit straps are
permitted. Complete, operative OEM suspension mandatory. Bolton
traction devices permitted. Control arms, strut mounting points,
etc., must be OEM, front and rear. Aftermarket springs and struts,
including coil-overs, permitted, but must utilize original OEM
mounting points. Final decision rests with NHRA Technical
Services. Spindle mounts prohibited.
WHEELIE BARS:
Prohibited.
26 SECTION 4 - BFGOODRICH TIRES STREET STOCK
BALLAST:
Permitted. See General Regulations 4:2.
CHASSIS:
OEM chassis, with complete OEM floorpan and firewall,
mandatory. Wheel tubs, back-half conversions, tube chassis, etc.
prohibited. Must retain FWD configuration; rear-drive conversions
prohibited. Engine must be located in OEM location for body used.
Roll bar mandatory in any car running 11.99 or quicker; roll cage
mandatory in any car running 9.99 or quicker or 135 mph or faster.
Non-OEM tubing in front of firewall prohibited except to tie shock
towers to roll cage. Roll cage in cars running 9.99 or quicker must
be inspected every three years by NHRA and have serialized
sticker affixed to roll cage before participation. See General
Regulations 4:10, 4:11, 10:6.
GROUND CLEARANCE:
Minimum 3 inches from front of car to 12 inches behind centerline
of front axle, 2 inches for remainder of car (except for exhaust
more than 12 inches behind centerline of front axle).
PARACHUTE:
Mandatory on any car running 150 mph or faster. See General
Regulations 4:8.
WHEELBASE:
Must retain original wheelbase for body used, plus or minus 1 inch.
Maximum wheelbase variation from left to right is 1 inch.
TIRES:
DOT approved radial tires, front and rear, mandatory. Rear
“skinnies” prohibited. Maximum diameter 25.0 inches. Maximum
width 225. All tires must be DOT approved and warranted for
highway use. Retreads, space-saver spares, or any other non-DOTapproved
tire prohibited.
WHEELS:
Wheels must be DOT approved. Off-road wheels prohibited.
Minimum wheel size 13 inches unless originally equipped with
smaller wheels and vehicle is equipped with original engine. Wheel
studs must be threaded into hex portion of lug nut a distance at
least equal to the diameter of the stud. Spindle mounts prohibited.
See General Regulations 5:2.
INTERIOR:
Complete interior, including dashboard, door panels, headliner, etc.
mandatory. Rear seat may be removed, but all other upholstery
and panels must remain in place. Two matching, upholstered front
seats mandatory. Aftermarket seats permitted, but must be fully
upholstered. All factory controls must be retained and operative;
i.e., lights, signals, horn, windows, and wipers.
SECTION 4 - BFGOODRICH TIRES STREET STOCK 27
STREET STOCK
BODY:
Body must be on NHRA Accepted Body list. Pickup and SUV
bodies prohibited.
Complete, OEM body structure mandatory, including floorpan,
firewall, strut towers, wheel houses, etc. Modifications to wheel
openings prohibited.
Mild customizing, body kits permitted, but must retain full-bodied
appearance, with minimum two functional doors. Doors must open
and close from inside and outside. Windshield and all windows
must retain OEM safety glass. Modifications to wheel openings
prohibited.
Lightweight body panels limited to hood and hatch or deck lid.
Aftermarket body kits permitted, but full street-legal appearance
must be maintained. One-piece aftermarket front end prohibited.
COMPETITION NUMBERS:
See General Regulations 7:2.
FIREWALL:
OEM firewall mandatory. See General Regulations 6:1, 7:4.
FLOOR:
OEM floorpan, front to rear, mandatory.
STREET EQUIPMENT:
Complete headlight and taillight assemblies (all) mandatory; must
be operative.
WINDSHIELD/WINDOWS:
Complete OEM windshield and windows mandatory. Windows must
be operative per factory specifications. (Must open and close via
electrical or OEM mechanical means.)
BATTERIES:
Batteries must be securely mounted; may not be located in driver
compartment unless sealed off per General Regulations. See
General Regulations 8:1.
IGNITION:
Two steps, rev limiters, etc. permitted. See General Regulations
8:1, 8:3, 8:4, 8:5.
MASTER CUTOFF:
Mandatory on any car running 9.99 or quicker, or 135 mph or
faster, or on any car where battery is relocated to trunk area of
vehicle. See General Regulations 8:4.
COMPUTER:
Prohibited. See General Regulations 9:1.
DATA RECORDER:
Permitted. See General Regulations 9:2.
FIRE EXTINGUISHER SYSTEM:
Permitted; must be securely mounted. See General Regulations
9:3.
28 SECTION 4 - BFGOODRICH TIRES STREET STOCK
TOW VEHICLES:
Prohibited.
WARM-UPS:
See General Regulations 9:4, 9:12.
CREDENTIALS:
All drivers running 10.00 or slower must have a valid state- or
government-issued driver’s license beyond a learner’s-permit level
or NHRA competition license. NHRA competition license
mandatory for driver of any car running 9.99 or quicker.
DRIVER RESTRAINT SYSTEM:
Three-inch-wide driver restraint system labeled as meeting SFI
Spec 16.1 mandatory in any car required to have a roll bar or roll
cage. System includes crotch strap and must be updated at twoyear
intervals from date of manufacture. All other cars, OEM
restraint system mandatory. See General Regulations 10:5, 10:11.
HELMET:
Helmet meeting Snell 90, 95, 2000 or SFI Spec 31.1A, 31.2A,
41.1A, or 41.2A mandatory. See General Regulations 10:7.
NECK COLLAR:
Mandatory on driver of any car running 9.99 seconds or quicker or
135 mph or faster. See General Regulations 10:8.
PROTECTIVE CLOTHING:
See General Regulations 10:10.