Street Stock Rules
 

Winchester Speedway

Street Stock

1. No high performance parts allowed except as stated.


2. Wheel base 108. min.


3. Stock suspension. May run aftermarket springs, 5 in Diameter.Aftermarket A-frame on top side only, top mounts must be in stock location none adjustable. Lower “A” Frame must be stock for the car. Leaf spring cars – shackles and blocks only


4. #1 plug in line with top ball joint. No variance


Engine option #1 Nesmith sealed 602 with Holley 650 cfm 4bbl no plate. 1" spacer .030 tolerance.


Engine option#2 Built Engine
Bore and Stroke


A. Stock bore - +.060 maximum.


B. Stroke - stock for CID of engine. Crankshaft may be aftermarket, must be stock appearing, and weigh no less than 48lbs.


C. Rods: must be stock length for CID of engine.


E. Camshaft: 480 valve lift MAX Hydraulic flat tappet cam only. Will be measured on the cam .



F. Carburetor-gas only


500cfm 2bbl gauge legal with choke horn 1" adapter max .030 tolerance. $350 Claim on 2bbl carb.


4bbl. MUST RUN TRACK RESTRICTOR PLATE – 1in. spacer plate max .030 tolerance. No taper allowed. ANY CAR (DRIVER & CAR OWNER) IN VILOLATION OF RESTRICTOR PLATE RULE WILL BE DISQUALIFIED FOR 2017 SEASON!!


G. Intake: ANY No porting or polishing.


H. Compression: 180# maximum. Will be checked with all plugs removed and throttle wide open until needle stops. Average of all cylinders.


I. Heads: Stock heads and S/R heads. Must be stock diameter valves for engine being ran. Small Block Chevy 1.940 intake, 1.500 exhaust. Small block Ford 1.940 intake, 1.600 exhaust. May be aftermarket valves: solid steel only. Valve springs must be stock diameter. No porting, polishing, grinding, etc. May have pinned or screw in studs and guide plates. Roller rockers permitted stud girdle OK.


J. Ignition factory type No ignition boxes no MSD . Ex HEI CHEVY.


K. May run aftermarket oil pans.


4. Rear End - Locked rear ends only. Any factory type rear end. Must be mounted with stock replacement brackets for the car that it is under. Southwest Speedway or equal. May be floater axle. May use rear disc brakes, calipers and hubs, must be same as factory no alum. (Example: front GM can be used on rear.) REAREND must be in factory stock position. Mounting points shall be the same as the factory for the type of car that the rear end is being used under. No light weight components allowed in the drive train Top trail arms may be shortened for pinion angle.


5. Transmission - straight shift legal. Must have all gears and be produced by manufacturer of car. Automatics must have working torque converter. BERT STYLE TRANSMISSION add 150 lbs


6. Clutch, pressure plate, and flywheel must be steel factory type minimum weight of 34lbs with no tolorence. No modifications. May be aftermarket. 10 ½” minimum diameter clutch.


7. Shocks –Steel body shocks. A claim price of $80.00 per shock . Front shocks may be mounted outside of bucket; rear shocks in same as stock location. Wedge bolts allowed


8. Brake pedals aftermarket OK in stock location firewall,floorboard mount ok.


9. Wheels - 10in steel wheel max. Bead Lock allowed on right rear and right front.


ALL CARS MUST HAVE DRIVESHAFT LOOP


10. Tires - H500 Hoosiers or Ar Equivalent


DOT 275 x 60 maximum street radials. Receive a 75 lbs weight break .


No chemicals allowed.


11. Bodies - Must be full bodied cars or truck factory stock appearing only. Any fabricated body must have all body lines. No flat sides will be allowed. MUST HAVE FACTORY STEEL TOP, stock appearing nose piece, and rear must be closed in. MUST LOOK LIKE THE ORIGINAL CAR. Weight penalties will be added for violations to this rule. 50 pound min in front of firewall.


A. Firewalls- Must be factory firewall and floorpan and must be in stock location. Must run to the rear of the drivers seat. Any patching must be 16 gauge metal.


B. Floor board removed beside driver, add 50lbs on right side frame rail.


C. Decking if used must have access panels to allow inspection of interior.


D. Spoiler - 8in. rear and sides. Two side spoilers max.


E. Bumpers - No sharp edges.


12. Weight - 368 and under 3200 lbs. 369 + 3300 lbs


13. Fuel tanks - A mandatory firewall between driver and fuel tank Fuel Cell or plastic style tank required.


14. Headers - No tri y or special performance headers ,no 180 degree headers $300 claim price.


15. Frame section in front of A Frame mount and behind rear suspension mounts may be replaced with tubing due to rust or excessive damage.


16. All glass and flammable parts must be removed.


17. Roll bars - All cars must have a min 4 point roll cage. 4 bars on driver’s side, 2 in passenger side. Cage Must be constructed in a safe manner to provide adequate protection in case of rollover.


18. 1" Lug Nuts Required


19. Safety - Must have working fire extinguisher, driver fire suit, helmet with shield, racing seat and belts in current date. Raceceiver is MANDATORY!!


20. Mufflers are required


21. Track reserves the right to adjust rules to keep racing equal.


22. ANY TIME IN DOUBT ALWAYS ASK.

Updated 1/23/17

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