Irwindale Speedway Super Stock Rules 2018
No pretense is made for having designed a foolproof set of rules and regulations. If this rulebook does not specifically state that you can alter, change, or otherwise modify something on your car, you should consider it a violation of these rules. No part is deemed to have been approved by Irwindale Speedway by passing through prior technical inspections.
The Tech Director shall be empowered to permit reasonable and appropriate deviation from any of the specifications herein or impose any further restrictions that in his opinion do not alter the minimum acceptable requirements. Any deviation of these rules is left to the discretion of the Tech Director.
A. Any 1960 or newer sedan. No Station Wagons, Convertibles, Pick-Ups, Jeeps, etc.
B. All cars must maintain stock OEM type body. Stock appearing fabricated door panels, rear quarter panels and deck lid allowed. No interchanging of manufacturer bodies and frames.
C. Original bodylines must be stock appearing on fabricated panels.
D. Hood and deck lid pins required.
E. Full stock floorboards and firewalls required. All holes to must be covered. Firewall sheet metal must remain in stock location.
F. All doors must be securely attached.
G. Rear trunk area may remain open.
H. Rear deck lid spoiler allowed maximum 5” tall and no wider than 60” wide.
I. No front lower spoilers allowed. Air scoop for radiator allowed, no wider than radiator.
J. A minimum of four (4) inches from body to ground.
K. Fiberglass front ends allowed.
A. Full NASCAR type roll cages mandatory. Main roll bars must be a minimum of 1.75” O.D. x .090” wall steel tubing.
B. Minimum of four (4) door bars required on both sides. Right side can be straight. C. Rear down bars must extend to rear cross member.
D. Fuel cell protector required, no more than the width of the frame rails.
E. Main roll cage uprights must be fastened to floor of uni-body cars with a minimum 3/16” thick
plate, top and bottom, at all four corners. Plate must be a minimum of 4” square.
F. Roll bar padding must be used at any point where driver may make contact.
G. Door bars must be covered with a minimum 1/16” thick steel metal plate, top to bottom, from front and rear uprights, welded to outside of bars.
H. Stock frames only. No modifications allowed.
A. A windshield made of 1/8” thick clear polycarbonate must be used. Windshields must be supported between the dash bar and the roof halo bar with a minimum of two (2) evenly placed metal straps 1/8 inch by 1 inch or a single 1.5” inch bar in the center of the windshield welded to the dash bar and the roof halo bar.
B. Each car may have a rear window made of clear LEXAN.
C. No right side window of any type is allowed. Side quarter windows behind the “B” pillar can be replaced with LEXAN. Driver side window net is required on all cars. Net material must be
minimum 1 inch wide and have openings of at least one (1) inch. Net must be equipped with a
quick-release device on the top left corner.
D. Left side mirrors allowed.
4. HEIGHT, WEIGHT, AND WHEELBASE
A. Minimum of four (4) inches of ground clearance.
B. Cars with wheelbases of 108” and over must weigh 3100 lbs with driver.
C. Cars with wheelbases of 107” or less must weigh 3150 lbs with driver.
D. All cars maximum left side weight with driver cannot be over 55%.
E. Wheelbase must be within ½” of other side.
F. After market fabricated replacement front clip add 50#
A. Stock type bumpers are required.
B. Front and rear bumper must be fastened to the fender and or quarter panel.
A. Cylinder compression limited to 200 lbs.
Ford 351 C.I.
Chevrolet 350 C.I.
Dodge 360 C.I.
Plus max .060 overbore
Maximum cubic inch 360cc.
B. A stock GM crate engine
P/N 19258602 allowed to
C. Engine must be in stock location.
D. Engine oil coolers allowed.
E. Aftermarket oil pans, valve covers, water pump, fan pulleys are allowed.
F. No “stroker” or lightweight cranks allowed, factory OEM cranks only.
G. Heads: Stock cast iron heads only. A stock head will be characterized as a cylinder head which
was offered as standard equipment with no performance advantage.
H. No special performance options will be allowed, including but not limited to, oversize valves,
special cut valves, relocated intake or exhaust bowls or ports.
I. No porting or polishing will be allowed.
J. Vortec heads are allowed.
K. Stock steel, stock stainless steel valve train components only, 1.5 ratio roller rockers allowed.
NO shaft rockers.
L. Screw in studs and guide plates allowed.
M. Engine Blocks: Stock cast iron blocks only. No modifications allowed.
N. Stock stroke for engine being used, exp. 350 C.I. Chevy 3.48” stroke.
O. Stock rods only after market rod bolts OK.
P. No roller or mushroom lifters allowed.
Q. Stock type timing chain and gears only.
R. No belts or gear drives allowed.
S. No crank lightening or grinding allowed.
T. No aftermarket lightweight cranks allowed.
A. All cars must run Holley #4412 or Holley Keith Dorton #80583 box stock carburetor
except for the following: Gaskets, bowl seals, accelerator pump squirter, power valve, jets, sight
plug, choked plate and shaft may be removed.
B. Two (2) carburetor return springs required.
C. Maximum 1” carburetor adapter allowed with square cut holes
8. AIR CLEANERS AND FILTERS
A. No cold air induction allowed, K&N air filters are allowed.
B. No air deflector allowed on front. Air filters only.
C. Top and bottom of air cleaner must be same diameter.
D. Tubes, funnels, or any device which may control the flow of air, will not be permitted inside the
air cleaner or between filter housing and carburetor.
9. ENGINE LOCATION AND MOUNTS
A. Factory stock location. Factory firewall only in stock location. No modifications.
B. Engine oil pan height must not be less than current car ride-height rule.
C. Crankshaft must be centered within one (1) inch of the vehicle’s front frame clip.
D. All mounts must be securely bolted and adjusted mounts are not permitted.
E. Minimum clearance between the center of the crankshaft and the ground must be 10.5” inches.
10. ELECTRICAL SYSTEM
A. Stock HEI type ignition only. No performance after market or MSD distributors allowed.
B. All cars must be equipped with a master electrical switch located in the
cockpit of the car. The switch must be within reach of the driver and safety crew from
the both sides of the car.
C. Batteries must be securely mounted within the confines of the body and behind the driver.
D. Batteries must be contained in a secure container. No marine or plastic boxes allowed.
E. Batteries must be mounted in front of rear axle.
11. ENGINE COOLING SYSTEM
A. All cars must have a functional fan.
B. Fan shroud mandatory.
C. Electric fans are permitted.
E. Water overflow catch can unit required vented out to windshield.
F. No anti-freeze or similar products.
G. Water wetter permitted.
12. ENGINE EXHAUST SYSTEMS
A. Stock manifolds are permitted. Cast iron only. No modifications allowed.
B. Headers are permitted. Must be 1 5/8” tube, down and back, chassis style headers only. No over
the top, step, 180s, TriY’s, cones or pyramids. Header must bolt to head. Exhaust pipes no
larger than 3” outside diameter. Two-into-one collectors are allowed.
C. An approved muffler is mandatory, must not exceed 90 db @100 feet.
D. Exhaust must extend past driver’s compartment.
13. DRIVE TRAIN
A. Clutch will be stock type only. Aftermarket master and slave cylinder allowed.
B. No lightweight or racing type disc, pressures plate, or fly wheels allowed.
C. Aluminum flywheels are not permitted. Steel OEM type only.
D. Scatter shields mandatory!
E. No lightening of flywheel permitted.
F. Locked, limited slip, or positive-traction differentials, is permitted.
G. Floater type rear ends are permitted.
H. Automatic transmissions optional, torque converter must be operational, transmission oil cooler
I. Ford 9” rear end allowed. Must be mounted as old rear end was removed.
J. Two (2) driveline straps, 1” x 1/8” required, mounting to be within 6” of the U-Joints are
required on rear drive vehicles.
K. Magnetic steel drive shaft must be painted white.
L. No aluminum or composite drive shafts.
14. SUSPENSION AND BRAKES
A. Stock OEM type lower control arms. Must be equal length.
B. Tubular upper A-arms allowed. Must be steel one piece with steel or aluminum cross
shaft. No slugs, bearings, or heim joints. Stock OEM upper A-arms allowed. Any OEM
factory production type of ball joint may be used. No “Mono Ball” ball joints. Spindles must be
OEM. No aftermarket or tubular spindle.
C. Stock upper control arm mounting may be moved for caster/camber, must remain stock height.
D. Rated springs are allowed, front and rear.
E. Lowering blocks allowed.
F. All other suspension components must be of original design and origin for the chassis used.
G. Maximum overall width (front or rear) shall not exceed 78” from outside of tire to outside of
tire at spindle height with driver in the car.
G. Steel shocks only. Non-adjustable, rebuildable, and/or re-valveable type shocks OK. Shocks must be
mounted in stock location. Shocks not mounted in stock location add 25# penalty.
H. Adjustable spring spacers or weight jacks allowed.
I. After market pedal or master cylinder assemblies allowed.
J. Rear disc brakes allowed.
K. Four wheel brakes required, and all must be in good working order.
L. On e adjustable brake bias valves allowed.
M. Any one piece steel sway bar mounted in stock location allowed.
15. STEERING COMPONENTS
A. Stock steering components only.
B. Quick release steering wheels are required.
C. Steering column must be collapsible. U joints are acceptable.
16. FUEL SYSTEM
A. Sunoco 110,E-85 or pump gas will be permitted. The chemical composition of the fuel may
not be altered by any means.
B. All cars must be equipped with an approved fuel cell mounted in the trunk area. Minimum 10”
C. Fuel cell must be mounted with steel framework (1 inch x 1 inch, .065 inch minimum) and must
have a vent hose and the hose must have a check valve in the end.
D. Fuel cell must be enclosed in an 18 gauge steel box. Ground strap required from fill neck to frame.
E. Maximum fuel capacity – 22 gallons.
F. No electric fuel pumps permitted. Fuel lines may not enter driver’s compartment.
17. TIRES AND WHEELS
A. Steel wheels are mandatory, maximum 8” width any offset. Tire and wheel must stay inside of
fender and quarter panel.
B. All four wheels must be same offset.
C. 5/8” wheel studs required on all four (4) wheels.
D. The use of any bleeder valve is prohibited.
E. Wheel spacers optional.
F. The track tire is the Hoosier #970.
G. TIRE PURCHASING RULE AS FOLLOWS: A t a c o m p e t i t o r s f i r s t r a c e
e v e n t h e / s h e may purchase a maximum of (4) four new tires. At each race there after he/she a maximum of (1) one new tire. Any new tire logged / scanned to car must be used in that days event.
H. In the event that a competitor flattens or damages a new tire, tire must be removed and inspected by head tech official before replacement will be allowed.
18. SEATS AND SAFETY EQUIPMENT
A. For all safety equipment. It will be the sole responsibility of the driver, not Irwindale Speedway,
their agents/officials or corporate officers to ensure that his/her safety equipment is correctly installed, maintained, and properly used. Please refer to manufacturer installation and guide lines and adhere tothem.
B. Aluminum professionally built high back racing seat required. No plastic, etc.
C. Padded headrest required.
D. Seat must be securely bolted to a mount assembly that is an integral part of the roll cage.
E. Seat will not be attached to the floorboard.
F. A five (5) point safety harness, with quick release is mandatory! 3” wide lap belt, 2” or 3”
shoulder belts, and a 2” submarine belt. All belts shall be attached to roll cage using minimum
3/8 grade 8 hardware and safety cables.
G. Safety harnesses/seat belts may be no more than three (3) years old.
H. Helmets; Head and Neck Restraint Devices:
i. Snell SA2010 or SA2015 helmet required.
ii. Full face helmets with Lexan face shield recommended.
iii. Nomax helmet, skirt, and Nomax covered chinstrap highly recommended.
iv. A HANS or Hutchens type head and neck restraint device is recommended.
J. Window net mandatory! Minimum 1” ribbon type with release at top only. It is required
that all window net releases be quick release seat belt type.
K. Fire suit mandatory at all times.
L. Approved racing gloves and shoes mandatory.
M. Eye protection is mandatory and must be in proper place at all times.
N. Current test date (2 pound minimum) fire extinguisher to be installed in the car within drivers
reach while strapped in. Steel mounts only, no plastic.
O. All cars will be required to have in their pits a minimum of one five pound, Halon or dry
chemical fire extinguisher.
P. Car and driver will be required to make safety rule violations comply PRIOR to racing any
19. APPEARANCE AND IDENTIFICATION
A. Numbers will be a minimum of 20” on the roof and both door panels. Numbers on the roof are
face toward grand stand. No aluminum foil type lettering.
B. Numbers assigned to car will be displayed on the top right front of windshield, 3” minimum.
C. Drivers first and last name to be placed above each door, on the roof in 3” letters minimum. E.
No duplication of numbers, additional letters such as “X”, “Y”, “and N” are not to be used. F.
Advertising or names on the windshield is not permitted. Reserved for a series sponsor.
D. Advertising that is deemed to be unsuitable/offensive, will not be allowed.
E. Series sponsor decals, if any, must be placed on designated location of car to be eligible
for awards. This is to be completed PRIOR to competing in any event.
A. You must have a spotter stand in the spotter stand at all times car is on track.
A. No electronic monitoring computer devices.
B. No digital gauges, timing retard controls or oxygen sensors allowed.
C. No electronic traction control devices allowed. 3.13.18