STREET STOCK DIVISION
DISCLAIMER
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The rules and/or specifications set forth herein are designed to provide for the orderly conduct of racing events and to establish minimum acceptable requirements for such events. By making an application for a competitor permit, it is deemed that the competitor agrees to become familiar with these regulations and abide by the directions set forth and prescribed by Management. No express or implied warranty of safety shall result from publications of, or compliance with these rules and/or specifications. They are intended as a guide for the conduct of the sport and are in no way a guarantee against injury or death to participants, spectators, or others.
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NOTE: IF IT DOESN’T SAY YOU CAN DO IT, ASK THE TECH DIRECTOR FIRST.
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This is the entry-level racing division. These vehicles are intended to be Fun, Fast, and Inexpensive. All vehicles should be “stock” to year, make and model with no modifications unless as stated below.
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BUILDING RULES
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Stock (Definition)
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For the purpose of this rule book the word “Stock” means: - Available on stock passenger car models, from the car manufacturer, installed per the manufactures specifications, with no modifications, visual or technical, stock appearing ,stock performing unless otherwise noted in the listed rules.
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Approved Models
General Motors: 1973 & up Nova/Venture/Monte Carlo/Chevelle/Lemans/Malibu/Impala/Parisienne or similarly designed cars. Ford: 1973 & up Torino/Thunderbird/Granada/Crown Victoria or similarly designed cars. Up to 1991 Crown Victoria. 1992-1995 Ford Crown Victoria allowed (must use drum brake housing from 1991 and prior) Chrysler: 1973 & up Dart/Satellite/Charger; 1978 & up Volare/Diplomat or similarly designed cars. No Mustang, Camaro, Cuda or similarly designed cars.
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Section 1 Bodies & Safety
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S.1 Open to any make of North American built car from 1965 to present inclusive with a
wheelbase of 110” or more as factory listed for that year, model, and those models a wheelbase under 110”.
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S.2 Bodies must be of original manufacturers design and stock appearing with steel body
panels only, minimum 20 gauge. (Body = Fenders, Doors, Roof, ¼ panels, engine
bonnet, trunk lid) Plastic nose, rear bumper covers permitted. Five Star roof allowed.
Five star fiberglass hood allowed.
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S.3 Sports cars, station wagons, convertibles are not permitted. Consult Tech / Management on
the possibility of trucks racing in this class.
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S.4 Bodies may be two or four door design with a minimum weight of 3400lbs, with driver in at all times.
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S.5 Car must retain stock original passenger floor panels, and firewalls or repaired in original
contour with same gauge metal. Any car not meeting these specifications in the opinion
of Tech is subject to weight penalties as will be determined by Tech. Minimum1/8th
steel floor plate must extend from back of seat to front of pedals.
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S.6 Doors must be bolted or welded shut and may not be cut down with the exception
of the right front door may be rolled down a maximum of 2”.
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S.7.Hood and Trunk lid must be hinged. Latches must be removed. A minimum of 2 pull type pins must be used on hood and trunk lids.
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S.8 Original or equivalent bumpers must be used and be fastened to the frame in the
original location. Bumpers may be reinforced but must retain stock appearance
and bumper ends must be tied into the body to prevent hooking. 1/8” plate may be
used to maximum width of bumper.
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S.9 All glass must be removed with the exception of the windshield, where 1/8” lexan to be
used and securely fastened.
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S.10 All exterior chrome, trim, and vinyl tops must be removed. Windshield trim only may be
retained if securely pop riveted in place.
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S.11 There must be a complete firewall of minimum 24 gauge between the driver and engine
and the driver and the fuel cell.
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S.12 Rear spoilers allowed. Must be no larger than 5 inches high, (measured on front).
No side boxing spoiler. Spoiler must not extend wider than ¼ panels.
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S.13 One rear view mirror permitted. It may be mounted in the center of the windshield or
mounted on either windshield post. Mirror must be kept within body lines. Two
mirrors permitted if seat has two neck restraints.
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S.14 All interior trim must be removed with the exception of the driver’s seat, which
must be an aluminum race seat. The seat must be securely bolted to the frame
with a minimum of four bolts of minimum 3/8” diameter, grade “5” quality or
better. Seat may be electrically welded instead of bolted, at four points with a
minimum weld joint of 2” at each point.
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S.15 Sharp edges or projections which could cut tires, cause damage or injury are not
permitted.
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S.16 Driver Safety Belts must be dated no more than 5 calendar years old.
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S.17 Fuel cell is mandatory and can be maximum of 16 gallon. Fuel cell must have minimum of 8 inches ground clearance.
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No aviation fuel allowed.
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S.18 Helmet must be rated SNELL 2010 approved or higher (No DOT or M)
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S.19 A Head and Neck Restraint or Neck Collar is mandatory.
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S.20 Driver must wear an approved fire retardant driving suit and gloves at ALL times car is
on the track. (Fireproof shoes and socks is also recommended)
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S.21 All roll bars within drivers reach must be padded. (Proper Fire Rated Roll Bar
Padding)
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S.22 Dirt Bars or Rub Rails maximum¼” X 2” flat bar or lexan.
Must Hug Body Line. Rails may be placed between wheel well openings and front
and rear of openings to bumpers. Bar ends are to taper into the body to prevent
catching onto or hooking another vehicle. Rebar rub rails not allowed.
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Chassis & Suspension
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S.23 Complete rear wheel drive frame only. No front wheel drive frames.
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S.24 All suspension parts are to be stock with no modifying.
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The car must be a minimum of six (6) inches off the ground measured at any point under
the "frame". Inspection height gauges must pass under frame with no contact.
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All vertical measurements will be taken with driver in car.
Impala, Caprice and Parisienne side frames will be measured on straight surface.
Rocker panels and all body panels must be a minimum of four (4) inches from the ground.
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Front coil springs may be OEM or OEM replacement type. Conventional OEM type race
springs allowed (i.e. AFCO, Hypercoil). No beehive or progressive rate springs allowed.
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Front springs must have stock coil spacing and have a minimum uncompressed height of 8.5 inches
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Springs must be a minimum of 5.0” O.D. (+/-½ “) in diameter. Front springs must sit in
the original OEM spring seats.
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Solid shims maybe used on the spring and seated in the original spring seat.
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Adjustable spring seats allowed (not welded) on front springs only.
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Maximum of 1 spring rubber allowed in each spring. (1 piece = 1 rubber)
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Springs must be of original design and in stock location. No coil-over spring/shock
combinations.
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Lower control arms, and all other suspension components must remain stock and retain
all original dimensions. All suspension mounting locations must remain in original
STOCK locations.
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All steering components must meet the original specifications of the manufacturer for
specific year, make and model. No extended length ball joints. Only stock OEM spindles
and rotors for year, make and model allowed.
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No cutting and/or welding pitman arm.
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No air shocks or bags.
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S24a Stock sway bar only. Bar MUST be mounted in original brackets under frame rail.
Sway bar MUST be mounted in OEM position on top of control arm. OEM sway bar
not to exceed 1 5/16”O.D. Sway bar may be adjustable.
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S24b Rear coil springs may be OEM or OEM replacement type. Conventional OEM type race
springs allowed (i.e. AFCO, Hypercoil). No beehive or progressive rate springs allowed.
Rear springs must be a minimum of 5” O.D. (+/- ½ “).and have a minimum uncompressed height of 10 inches.
Rear springs must have original spacing. Rear spring seats may be modified to accept
closed coil- ground spring.
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Recommended 1” bucket type spring seat on differential housing. Solid shims may be
Used. Maximum of 1 spring rubber allowed in each spring ( 1 piece = 1 rubber )
ABSOLUTELY no adjustable spring seats allowed. One load bolt spring adjuster
allowed in rear. It may be installed on left or right but NOT both.
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S.25 One stock replacement shock absorber per wheel in stock position using stock
mounting hardware is permitted. Pro SS or Afco Racing shock is allowed. Otherwise Shocks must be stock replacement GAS shocks. All shock numbers MUST be readable. Shocks will be deemed illegal if numbers are unreadable. All shocks must be mounted at original stock angles and locations.
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S.26 Minimum wheelbase for cars is 108" Any car with a “shorter" wheelbase will add 25 pounds for every inch shorter than stock.
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S.27 Maximum track width for all cars is 66" measured center to center of the tires.
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S.28 No Bumpstops / Coil Binding or Modifying suspension to limit travel.
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Front springs must be wrapped with duct tape to confirm there is no coil binding. Car will not pass post-race tech inspection if springs are not taped.
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Weight
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All cars must weigh a minimum of 3400 pounds with driver at all times. Any car with a GM crate engine must weight a minimum of 3450 lb. with driver, full of fuel.
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Maximum left side weight 53% of total weight.
Maximum rear weight 45% of total weight.
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Sportsman chassis cars must have a total of not less than 50 lb of weight on the right front frame rail and may be required to reduce the left side % up to 1 % at the discretion of the Tech. ie 52% max
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S.29 Any weight must be fastened solidly to the frame.
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No weight to be mounted below the frame.
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S.30 Aftermarket upper control arms allowed. MUST BE STEEL ONLY. Arms may be different
lengths. Homemade control arms are not permitted. Any violation of this rule will result in
a full suspension infraction.
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S.30a Aftermarket rear control arms allowed. Must be stock specification. Homemade control arms are not permitted.
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S.31 All cars must have full frame. Unitized bodies may be used provided the front and
rear sub frames are joined with material equivalent in strength to the frame
material. Variation to this rule may result in weight penalties determined by the
Technical Inspector. Tech may require other adjustments for non conforming cars in the interest of good competition.
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Engine
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S.32 Must be produced by the same manufacturer as the car and must not exceed 360cu.in
displacement. Engines must be stock, no performance engines. Early engines such as 275 hp 327 cu. in
are not permitted. No solid lifter type engines such as 302 CHEV, 350 LT1, and 340 Mopars.
Camshafts must be STOCK, low compression type available in 2 barrel engines:
i.e., no 350 h.p. hydraulic Chev camshafts. No Cleveland engines. Maximum
overbore .060
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S.32A The GM #12499529 long block crate engine will be allowed. It comes complete
except for an intake manifold, water pump and balancer. A 2 bbl cast iron OEM intake
must be used. The carburetor will be a 2 bbl Rochester which must be used with no
adapter. This engine is available through any local GM dealer. The engine must be sealed
prior to competition. The performance of this combination will be closely monitored and will
be subject to possible adjustments with prior notice.
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S.33 Cam Shafts
GM-Maximum lift .390 Intake - .410 Exhaust Duration 195 Intake – 204.
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The lobe separation angle (valve overlap) must be only 112’
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Ford Lift - intake .419 exhaust .448
Dodge Lift - intake .410 exhaust .410
Camshafts must be installed straight up. No degreeing or offset keys or bushings on camshaft or crankshaft.
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S.34 Heads must be stock, low compression type and may not be interchanged. i.e. no 300hp
heads on Chev engines, no 340 heads on 318 mopars, 351 heads on 302 fords, etc.
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S.35 Stock valves, lifters and springs. Heads must retain stock valve size for casting number
on head. No 2.02 valve heads. Stock valve train only including rocker arms and ratios.
No pump up or Rhodes style lifters. Maximum allowed valve lash of zero.
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All cylinder heads must be cast iron.
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S.36 Pistons must be cast.
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S.37 All engine components must be completely stock, no porting, polishing, machining or
coating is permitted. No balancing. Cylinder heads may be planed
a maximum of .030”.
S.38 Carburetor must be stock 2 barrel originally available on the car. The 2bbl Rochester, SMI and JET brand carbs are approved. No Holley carbs allowed. They must be stage #1 configuration with all stock measurements. All other non- approved brands and stages will be deemed illegal. It will be the owner’s responsibility to provide proof of brand being used.
S.39 An Air cleaner must be round and a maximum diameter of 17 inches and centered on carb
air horn. Any external lips cannot extend any further rearward than center of carb air
horn.
S.40 Stock unaltered manifolds only GM log type. Only one exhaust pipe per manifold of
maximum 2” outside diameter may be used, they must extend behind
the drivers position under the car. Exhaust must remain under the car. No ram head
manifolds, marine , heavy equipment, etc. Manifolds must be ones that are available on a motor vehicle(car) only.
S.41 Stock compression ratio no greater than 8.5 to 1 (8.7 to 1 will be deemed illegal).
Engine must be in stock location. Original mounts or same thickness.
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S.42 Engine must hold 20” of vacuum at 800 RPM on track gauge for built engines.
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For the GM crate engine, Normal engine manifold vacuum for the 350/290 HP engine is 10-12” Hg at idle (650-750 rpm).
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Driver responsible for vacuum reading.
Power Train
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S.43 Three speed automatic transmissions. No 2 speed automatic or standard
transmissions. Transmission must have stock OEM gear ratios.
S.44 Transmissions must be stock and originally available on the car.
S.45 Proper Torque Converter for engine. Must meet stock specifications.
S.46 Quick change rear ends are not permitted.
S.47 Aftermarket transmission coolers are permitted.
S.48 Factory brake systems only.
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Wheels & Tires
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S.49 All wheels must not exceed 8” in width.
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S.50 All wheels must be steel.
S.51 Tires allowed will be 890 Hoosiers.
S.52 All tires must not be less than a Durometer reading of 52.
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S.52a A maximum of 2 new tires may be used for any 100+ lap race and a maximum of 1 tire may be used for any race that is less than 100 laps. All other tires on the car for that race day must be used tires. A used tire is defined as any tire with less than 5/32's tread depth. Once qualifying begins for the race event all tires on the car must remain on the car for the entire race day. If you have a tire failure once the race event begins you must request the Tech to authorize you to replace the flat with one of your approved spares. A Maximum of 8 tires (new and used, including 4 spares) may be approved by the Tech for a race event. Teams should bring these tires with them to Tech for inspection and approval when you Tech.
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Teams may practice on non race approved tires.
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S.53 Maximum wheel offset will be 2 inches.
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All wheels must be the same backspace on all four corners. 1” offset spacer on metric chassis only and must run on ALL four wheels
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Section 6 Gear Ratio
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S.54 Maximum gear ratio is 6.10:1 final drive with transmission in first or second gear. To
find ratio multiply rear end gear ratio by transmission ratio. No 1 to 1 ratios. All gears in transmission must remain same ratio as produced by OEM.
