SECTION 9- STREET STOCK

9.1.1           DEFINITION

9.1.1           The word stock will mean unaltered as originally factory produced and installed for make and model. All cars and trucks will be stock unless otherwise specified in these rules. In the case of a car having a body that is of a model other than the model of the chassis; Stock will mean unaltered as originally factory produced and installed for the make and model of the chassis when chassis items are in question and vise versa when body items are in question.

9.2                COMPETING MODELS.

9.2.1           1955 or newer standard sized American made cars, trucks, coupes or wagons. Two seat models not approved.

9.3                MINIMUM WEIGHTS – post Event

9.3.1           Minimum total weight as weighed with the driver will be 3,300 lbs. (post race, post qualifying)

9.3.2           Maximum left side weight percentage as weighed with the driver will be 55.00 %.

9.4                ENGINES

9.4.1           Must be same make as the body. GM to GM, FoMoCo to FoMoCo, Mopar to Mopar

9.4.2           Only factory produced OEM parts and components will be approved. Unless otherwise specified.

9.4.3           Pistons, valves and valve springs may be factory type replacement of similar weight and material.

9.4.4           Engine must remain in stock location or no further back in the engine compartment as to allow the center line of the upper ball joints to be forward of the number 1 sparkplug. Aftermarket engine mounts approved.

9.4.5           It is recommended that compression ratio not exceed 10.5 to 1.

9.4.6           HEADS

9.4.6.1      No porting of cylinder heads allowed and will be stock for make.

9.4.6.2      No Bowtie, Cleveland v-4, or W-2 heads. No after-market heads allowed.

9.4.6.3      Machining for screw in studs approved. Machining on head for use with early model intake manifolds approved. Machining for the purposes of truing or surfacing approved.

9.4.6.4      Stock type rocker arm assembly only. After-market stamped steel replacements of similar weight and material approved.

9.4.7           Intake manifold will be stock for make cast iron only, cast iron marine applications approved. No aluminum. No porting.

9.4.8           Exhaust manifolds will be stock for make. Headers not approved. No porting approved.

9.4.9           Camshafts may be hydraulic or flat tappet of any manufacturer. Use of cam button approved. No Roller or Mushroom camshafts approved.

9.4.10       Cam timing will be chain and gear type of any manufacturer.

9.4.11       Ignition will be stock for make camshaft driven distributor only. No magnetos, MSD or after-market performance parts. Modules, points and coils will be factory stock type replacement, no MSD Parts or Coils approved.

9.4.12       Flywheel must be steel and unaltered with factory casting numbers intact. Machining of flywheel permitted for balancing and surfacing only.

9.4.13       Clutch disc and pressure plate will be stock type replacement, no racing clutches approved. 10.4” will be the minimum clutch disc diameter. Hydraulic throw out system approved.

9.4.14       Fuel pumps must be factory type replacement. No electric pumps allowed.

9.4.15       Air cleaner or butterfly cover required. Hood may be clearanced for taller air cleaner.

9.4.16       Racing fuels allowed. AV-GAS approved.

9.4.17       Oil pans may be over-sized. After-market claimer pan approved. Oil coolers and remote filter locations are approved.

9.4.18       Aftermarket steel or aluminum water pumps approved, pulley system optional.

9.4.19       Alternator not required. If an alternator is used it must be stock.

9.4.20       Mechanical fan only, aftermarket allowed. Must be shrouded minimum three sides. (top and sides)

9.4.21       After-market dampners of factory diameter approved.

9.5                CARBURERATION

9.5.1           Holley 4412 is the class carburetor. No other carbs approved unless otherwise noted.

9.5.2           Removal of choke horn is not permitted.

9.5.3           Carburetor adaptor will not exceed 1” in thickness, material optional.

9.5.4           NON MARINE intake manifolds will be allowed an additional 1” spacer plate between the carburetor and the manifold for a total maximum of 2”

9.5.5           Restrictor plate may be required at any race, available from track if used.

9.5.6           All carburetors will be incompliance with the standard go, no go, tech gauge should the track warrant an inspection.

9.5.7           Two throttle return springs required.

9.6                TRANSMISSION

9.6.1           Automatic transmission use is optional.

9.6.2           Transmission must be stock for make.

9.6.3           Torque converters will be stock stall speed.

9.6.4           Transmission coolers and cooler lines shall be contained outside of the driver’s compartment. Is also must be located in front of the front firewall or behind the rear firewall. Any Transmission cooler located other wise will be subject to tech approval for driver safety.

9.6.5           Manual gearboxes will be stock for make with no alterations.

9.6.6           NHRA approved explosion proof bell housing for manuals or a transmission blanket for automatics is recommended.

9.7                REAR END

9.7.1           May be stock for make and model. Swaps from other makes will be allowed; all mounting points must be made to be direct bolt in to receiving car.

9.7.2           Gear ratio optional.

9.7.3           Welding, mini spool or full spool may lock differentials.

9.7.4           No posi-trac, limited slip, Gold trac or Detroit Lockers.

9.7.5           Floater rear ends not approved.

9.7.6           Aftermarket axel allowed on the RR.

9.8                BODY SPECIFICATIONS

9.8.1           1955 though current American made sedans, coupes, or pick-ups. Windshield posts are mandatory. All bodies and body panels shall be maintained or replaced as needed to keep stock appearing look, as approved by Officials or Promoter.

9.8.2           Body and chassis must be of the same make.

9.8.3           Body must be complete for declared make and model.

9.8.4           Wheel base minimum will be 101”. Wheelbase will remain stock for make and model of chassis. No car will be allowed a tolerance from side to side of more than ¼”. 

9.8.5           Bodies to remain stock in appearance. Destroyed panels must be repaired or replaced. Steel replacement panels may be fabricated from minimum 20 gauge sheet metal and must follow original body lines. Must resemble stock look, at tech discretion.

9.8.6           Fenders and quarters panels may be trimmed for tire clearance. Trimming not to exceed 3” from top of tire. Tech discretion

9.8.7           All exterior molding and lights must be removed, including rear and side glass. Head light openings must be covered. Rear glass may be replaced with minimum 1/8” lexan, or louver.

9.8.8           Windshield optional. If removed it must be replaced with a maximum ½” X ½” wire mesh screen covering the entire opening and be securely mounted. Lexan windshields approved. Windshield opening must have one or two “tire bars” securely welded into the opening to prevent a tire or like object from entering the driver’s compartment.

9.8.9           Rear spoilers are approved. If spoiler is other than factory stock for make, it may not exceed 6” in height and 60” in width.

9.8.10       Front inner fenders may be removed. All other inner panels may be trimmed, including hood and rear deck lid.

9.8.11       Inner panels in trunk area may be removed for fuel cell installation.

9.8.12       Hood and rear deck lid will be securely fastened using (4) four hood pins or (2) two hood pins and (2) two hinges. NUTS AND BOLTS ARE NOT APPROVED FOR SECURING HOOD OR DECK LID.

9.8.13       Front firewall will remain stock and in stock location. All openings shall be filled or repaired with a minimum 22 gauge sheet metal.

9.8.14       Stock floor pan will be intact and complete from the front firewall rearward to at least the bottom of the rear seat riser. Any holes must be filled or repaired with minimum 22 gauge sheet metal.

9.8.15       Rear firewall will be intact. Stock material may be replaced with minimum 22 gauge sheet metal. All openings shall be filled or repaired with a minimum 22-gauge sheet metal.

9.8.16       Frame and/or unibody must be complete and unaltered unless other wise noted within these rules. Front cross member notches that are not being used will be approved. i.e, fuel pump clearance.

9.8.17       Repaired rear frame sections will be allowed with tech approval and will be replaced with stock donor frame material.

9.8.18       Replacement of damaged rear stock rails with tube steel, may be weight penalized if tube steel replacement extends forward of the rear end centerline. Tech discretion.

9.8.19       Any weight penalties are at tech discretion.

9.8.20       Exterior nerf bars optional. Nerfing not to extend more than 1 ½” past the body skin at any time, ends must be capped or welded shut. Nerfing allowed on both sides, between front and rear tires only. 1” O.D. round or maximum 1” X 2” square tubing is the only approved material for exterior Nerfing.

9.8.21