download and printing - Stock Car Rules
- Rules apply at all times car is on track. Snell-rated SA2000, SA2005 or SA2010 helmet required. Roll bar padding required in driver compartment (Fire retardant recommended). SFI-approved full fire suit required. Fire retardant gloves, shoes and neck brace (or head and neck restraint) required
- Right and left seat head supports required if using head restraint system with no neck collar. Recommended: Fire retardant head sock and underwear; collapsible steering shaft.
- Driver-side window net required, minimum 16 inch by 20 inch ribbon or mesh style, and must be mounted to roll cage so latch is at top front of window.
- Minimum three inch (two-inch with head restraint system) wide SFI-approved five point safety belt assembly required (Y-type shoulder harness not allowed), must be mounted securely to roll cage, and must be no more than three years old.
- Kill switch required within easy reach of driver and must be clearly marked ‘OFF’ and ‘ON’.
- It is recommended that each racecar have built-in fire extinguishing equipment, but cannot be of the dry powder type (must be Halon 1211 or equivalent).
- Drivers should have in their pit area as part of their equipment, at all times, a fully charged dry chemical, Halon (or its equivalent) fire extinguisher. Ten (10) or thirteen (13) pound fire extinguishers are highly recommended.
- Absolutely no plastic except from edge of firewall to body skin, nose pieces, tail pieces, and inner wheel tub to body skin.
- Any American OEM full body rear wheel drive passenger car 1964 or newer.
- Minimum wheelbase of (107) inches required for all cars. Maximum (2”) difference side to side permitted.
- Full frame cars must retain front frame horns. Rear of frame behind rear tires, no further forward than one inch behind factory seam, may be replaced in OEM location with two inch by three inch steel tubing with minimum 0.095 inch wall thickness, same length as material removed. Factory seam must remain visible.
- All unibody cars must have front frame and rear frame tied together. Frames may be “X” braced. No station wagon, front wheel drive, or 4 wheel drive frames permitted. All frame crossmembers must be unaltered, in stock location (exception: transmission crossmember may be altered or removed, horn may be removed from center of front crossmember, and weight-jacks may be added (see sections 10 and 18). Must have a 360 degree driveshaft loop no more than 6” behind the front u-joint. Must be minimum 0.250” x 2 “ steel or 1” tubing.
- Rear bumpers may be fabricated of round tubing with a minimum 1.250 O.D. (maximum 2 inch) 0.083 (maximum 0.250) wall thickness. Rear bumpers may not extend past the width of the body. Front bumpers may be OEM or fabricated with round tubing minimum 1.250 O.D. (maximum 2 inch) 0.083 (maximum 0.125) wall thickness. Corners must be bent and round. Ends of tubing must connect to front frame horns.
- Motor mounts may be aftermarket and engine may be moved back. For GM metric frames center of fuel pump must be located minimum 1.75 inches in front of cross member or from back of block to front of crossmember (measured at frame) – 18.75 inches (GM), 22.625 inches (Ford), 21.75 inches (Chrysler) Crossmember may be notched for fuel pump. All others must have ball joint in line center of #1 and #2 spark plug (+ or – 1”).
- Main cage must consist of continuous hoops, minimum 1.666 inch O.D. (1.750 recommended) with a minimum 0.095 wall thickness (low carbon or mild steel recommended). Four post main cage required and must be properly welded to frame, NOT floor pan. Poor or missing welds may be deemed unsafe by a track official and may result in disqualification.
- A minimum 1 crossbar (minimum 1.666 O.D.) required in top halo and must be welded diagonally. Rear halo must be “X” braced. Front and rear down bars must be tied side to side. Top door bar must be a minimum of 36 inches inside to inside of front and rear down bars. Must be a minimum of 26 inches at bottom of top halo measured inside to inside of front and rear down bars. Must be a minimum height of 16 inches from top of door bar to bottom of halo. With helmet on and driver securely strapped in driver head must not protrude above bottom of roll cage. All bars within reach must be padded with a material accepted by track officials, flame retardant recommended.
- Minimum of (4) 1.666 O.D. or (3) 1.750 O.D. horizontal door bars required on driver side (minimum 0.095 wall thickness). Horizontal door bars must be mounted perpendicular to frame and must have a minimum of (4) uprights from frame to top door bar.
- Steel door plates made of 18 gauge or 0.049 inch minimum thickness must be securely welded to outside of driver door bars. Plate must cover from top door bar to rocker and must extend from rear down bar to 5 inches in front of front edge of seat. Plate must be visible for inspection.
- Rear kickers (down bars) and fuel cell protection required (minimum 0.083 wall thickness), front hoops are allowed. If front hoop is not used must have two front kickers (down bars) welded to frame no further back than front of upper a-arm. Fuel cell protection and front kickers or hoop must be a minimum 0.083 wall thickness and 1.250 O.D. A maximum of (2) additional bars may be added for radiator protection not counting bar tying frame horns together and must be within confines of the body. Fuel cell protection must be same height as fuel cell and extend from frame rail to frame rail (maximum 1.750 O.D. tubing allowed) and must remain inside confines of the body.
- All vehicles MUST have tow loop or strap mounted front and rear and must be easily accessible.
- 1964 or newer American OEM stock passenger car bodies or aluminum aftermarket pro stock bodies allowed (NO LATE MODEL WEDGE BODIES). All bodies must have all four fenders and must resemble a production vehicle. All bodies must be approved by SOS officials. All glass, plastic, upholstery, rear seats, lights, mirrors and chrome must be removed. Interior tin or other covers not allowed. Doors must be welded or bolted secure. All sunroof and T-top openings must be covered with sheet metal. Must have nosepieces and tailpieces.
- Front OEM firewall may be replaced using steel fabricated firewall, 18 gauge or minimum 0.049 inch thickness. Top of firewall can be no further back than 12 inches from the back of engine block, measured horizontally. Bottom of firewall can be no further back than rear of oval body mount frame hole. Dash must not extend more than 24 inches back from top of firewall. Dash must be flat, rear can be no higher than front, except for cowl in front of driver. OEM floor pan may be replaced using steel fabricated floor pan, 18 gauge or minimum 0.049 inch thickness, securely welded to frame. Floor pan may be replaced from front firewall to rear halo supports. Floor pan must remain flat/OEM appearing from frame rail to frame rail, can be no higher or lower than top or bottom of frame rail. Exception is maximum 8-inch tall driveshaft tunnel. Tunnel must remain similar to OEM tunnel in size. Interior may be decked, must have access panel for inspection. Rear firewall may be aluminum or steel and no further forward than rear halo and no higher than bottom of rear opera windows. All holes in firewalls must be covered with metal. No driver-adjustable devices allowed while car is in competition except brake bias adjuster. No mirrors. Hood must be secured by a minimum of four hood pins located at all four corners. No tilt front ends, hood must be separate from fenders. Back of hood must be sealed from driver area.
- Front nosepieces and rear tailpieces must be securely riveted or bolted in place.
- Spoilers are allowed with a max width of 60” not to exceed outer edge of body, max 7 inches of material height and no more than 3 supports allowed. Spoiler ends and supports may exceed 1” height of spoiler center and are allowed a maximum length of 12”.
a. All racecars must have numbers that contrast to body color and must be minimum 4 inches thick and 18 inches tall for both sides and must be 4 inches thick and 20 inches tall for roof and must be clearly legible. All racecars must have numbers on the right rear corner of the back of the vehicle and must be minimum 4 inches tall.
b. Officials reserve the right to approve or disapprove any image of lettering or sponsorship on any racecar or pit vehicle entering race surface. Keep in mind this is intended to be a family fun facility.
- Maximum seven inch visor allowed on front windshield area. This includes additional tape.
- Maximum one inch wide by two inch tall steel or lexan rub rails allowed – bolted flush to body.
- Driver compartment must be sealed off from engine, fuel cell, and ground.
- No loose objects or weights/ballast allowed in driver compartment. No rear view mirrors.
- Minimum 3 windshield bars required in front of driver and must be secured. Dash must be level with hood except for cowl in front of driver.
- Interior may be decked (open interior recommended), if interior is decked an access panel must be in place in order to inspect floor pan and fire walls. All decking must be free of sharp edges within driver reach.
- All fuel lines passing through driver compartment must be protected by metal or galvanized pipe or conduit.
- Factory-manufactured high back racing seats are mandatory, and must be acceptable to officials. Homemade aluminum, plastic or fiberglass seats are not allowed. Full containment seats are recommended. Driver seat may be no further back than 20” in front of rear tire. Seat must be bolted in using minimum 0.375” (3/8) grade 8 bolts and must be secured to frame or roll cage, NOT floor pan. Seat must be mounted in left side of the tunnel of driver compartment.
- Aftermarket quicksteer may be mounted in front of driver and must remain of left side. No chain and sprocket units allowed. Quick release steering coupler is mandatory.
- Brake bias adjuster may be within reach of driver. No other adjustment allowed within driver reach while in competition.
- One 12 volt passenger car battery only, must be securely mounted between and above frame rails, and must be covered with rubber or nonconductive plastic. Battery must not be mounted in driver compartment.
- Starter must bolt in OEM location. Car must have capability of starting without being pushed or pulled. Car must leave initial staging area on demand, unaided, or go to rear of that race.
- Only one (with no live timing adjust) ignition box is allowed. Coil must remain in cap for HEI type ignitions. All ignition wiring must be accessible for inspection.
- High End Rev Limiters allowed, may use MSD PN 8728 or MSD box, SOS reserves the right to implement a rev limiter chip rule.
- No unapproved cameras, transmitting or listening devices (exception is one-way RACEceiver radio by officials), timing retard controls, or digital gauges (including tach). No electronic monitoring computer devices capable of storing or transmitting information except memory recall analog tach.
- All wiring must be visible for inspection. OEM type alternator with internal regulator allowed. No electronic traction control devices.
- Kill switch required within easy reach of the driver. The switch must be clearly marked “OFF” and “ON”. All battery cables and electrical must be securely mounted and protected.
- Automotive gasoline or racing gasoline only! NO E85. Additives of any kind are not allowed.
- Electric or belt driven fuel pumps are not allowed.
- A limit of one (1) standard fuel filter is allowed between the fuel cell and the carburetor. Fuel filter cannot be mounted in the driver compartment. Cool cans are not allowed.
- No cool cans or cold air boxes or air cleaner ductwork.
- Carburetor: One (1) properly installed carburetor is permitted. May use altered Rochester 2bbl, Motorcraft 2bbl, and Holley 0-7448, 0-80787-1, 0-4412, or 0-80583-1. May use a one and three-quarter (1 ¾) inch butterfly. See engine rules for intake specifications.
- Fuel cell must be commercially manufactured for racing applications. No boat or stock automotive fuel tanks. Must be securely fastened inside trunk area of racecar. Fuel cells must be in steel container. All mounts must be made of steel and surround the fuel cell and attached to frame or roll cage.
- Must have check valve. Fuel cell vent, including cap vent, must have check valves, a flapper spring or ball-type filler valve.
- Steel, unaltered OEM, or unaltered OEM replacement, four wheel disc or disc (front) and drum (rear) brakes. Steel hat and rotor assemblies allowed on floater rear ends, must be stock diameter .Aluminum GM drums are not allowed.
- Aftermarket pedal assemblies with single or dual master cylinders allowed. No oil bath front hubs. Hubs/rotors, axle flanges and drums may be changed to different bolt pattern and larger studs. Must use OEM vented rotors. Drilling, lightening and/or scalloping rotors are not allowed.
- Brake proportioning valve allowed on right front only and may not be within reach of driver.
- All calipers must be OEM steel
- Must have three functional brakes. Only right front may be omitted. Brakes will be tested!
- All components must be steel unaltered OEM, in OEM location and match frame. OEM steering column may be replaced with steel steering shafts (steering shafts must have a joint every 5 ft., collapsible steering shafts highly recommended). Steel knuckles only.
- Steering wheel and quick release (required) may be aluminum.
- All components and mounts must be steel, unaltered OEM, in OEM location and match frame, except for upper a-arms. Upper A-frames may be replaced using aftermarket upper A-frame (steel or aluminum cross shaft allowed). Bolt on spindle savers allowed. Upper A-frame mount may be non-adjustable steel weld on and may be moved from OEM location. Bolt pattern must match OEM mount bolt pattern.
- Magnet must stick to all components.
- Weight jacks allowed. May not be adjustable from inside driver compartment. Must be in stock location.
- Coil springs must be minimum 4.5 inches O.D. and non-progressive and 1 piece.
- All components and mounts must be steel. Suspension type must match type of frame used. No bearing type or offset bushings allowed. Lower control arm mounts may be 7.5 inches long maximum. A total of 5 holes may be drilled to allow for lower control arm adjustment. Fabricated rear trailing arms allowed and must remain stock dimensions.
- Upper control arms must be level side to side and non-adjustable and must remain stock dimensions, may be fabricated with 2x2 tubing.
- No independent rear suspension. No sway bars, panhard bars, chains or cables.
- Coil springs must be minimum 4.5 inches O.D. and non-progressive.
- Weight jacks allowed and must be in stock spring location.
Tires and Wheels
- 8 or 10 inch wide steel wheels only. NASCAR pull-off slicks, Hoosier or American Racer G60, or KK704 tires allowed. Must have minimum 3/8 studs with 1 inch lug nuts. Tires must durometer 60 or more after the “A” feature. 1” lug nuts mandatory! May run bead locks on right rear of car only.
- All tires may be grooved and/or siped.
- Softening is not allowed. Solvents of any kind are not allowed. Any changes which alter the manufacturer’s production status of the tire is not allowed except for grooving and siping.
- One unaltered steel body shock, nonadjustable, per wheel. No coil-over shocks, air shocks, remote reservoir shocks. No Schrader or bladder type valve allowed. No coil-over eliminators.
- OEM and Ford nine-inch rear-ends and floater rear-ends are permitted, but must be mounted like stock rear-end for that make and model. Truck rear-ends are not allowed. No quick change allowed.
- Rear-end may be welded, mini spools and full spools allowed. No torque dividing differentials.
- Rear-end must be centered on chassis.
- One inch inspection hole in housing required.
- Gun-drilled or titanium axles are not allowed (axles must be made of steel).
- All mounts must be securely welded, no floating or clamped mounts.
- Minimum 2-inch diameter, white, steel drive shaft only. Steel slip-yokes only. 360-degree drive shaft loop required, constructed of at least 0.125-inch by 2-inch steel or 1-inch tubing, and mounted 6-inches back from front U-joint.
- Differential yokes must be made of steel.
- Automatic transmission
a) Must be OE automatic. Torque tubes allowed. Dummy converters allowed. Lightened flex plates are not allowed.
b) At least one forward and reverse gear must be operational.
c) Must have approved scatter shield constructed of minimum 0.125 inch by three inch steel, 270 degrees around flexplate. Flexplate must be full, recommend SFI approved. No manual bump starts allowed.
- Standard transmission
a) 3 or 4 speed OEM transmissions. Must have at least one forward and one reverse gear.
b) Flywheels may be lightweight. Must be able to stop and take off unassisted.
c) Minimum 6.25” clutch must be mounted on flywheel and functional. NO internal clutch transmissions allowed.
d) Must have approved scatter shield constructed of minimum 0.125 inch by three inch steel, 270 degrees around flywheel. Flywheel or flexplate plate must be full, recommend SFI approved. No manual bump starts allowed.
- Aluminum water pumps allowed
- Electric or belt driven fuel pumps are not allowed
- Cooling system may be modified, sprinkler systems are not allowed
- One radiator is permitted and must be mounted in front of engine with overflow tubes pointed toward the ground in between the frame rails
- Accumulators and Accusumps must be mounted in the middle of the racecar or behind the driver but not on the doorbars
- Cold air boxes or air cleaner ductwork is not allowed. Top flow housings are permitted.
- No marine type components allowed
- Must be stock appearing, no external changes or machining allowed
- Must use stock firing order for that engine, no cylinder swap cams
- All engines must be able to be used in a conventional vehicle without any alterations
- Roller rocker arms are permitted, stud girdles allowed, no shaft mount or pedestal rocker assemblies allowed.
- Wet sump oiling systems allowed only, oil pump must mount in the stock location.
- NO roller cams or lifters
- Steel heads, block, and oil pans only
- Stock blocks only, NO bow tie, Ford SVO or Chrysler W blocks allowed.
- Any cast iron heads allowed, no porting or polishing allowed.
- Intakes: Unlimited cubic inches may use Edelbrock (2701, 2716, 2176, 3721, or 2181), Weiand (7547-1, 7515, 7516, 7545, or 8323), any low rise stock 4 bbl intake (no porting or polishing, webbing on top may be removed up to 1” down). Maximum 368 cubic inches or smaller may use any aluminum or cast iron intakes (no custom sheet metal), no porting or polishing.
- Round tube headers only. Headers must exit under vehicle. Headers must expel gasses away from the drivers compartment. No 180 degree, zoomies,Tri Y, or over the top headers allowed. Exhaust may not protrude through fender, doors, or floor pan. Exhaust cannot be connected, no crossovers or equalizer tubes. All tubes must meet at one collector. No electronic devices allowed. Mufflers required (may use 3-ring, cone, perforated inserts or IMCA 609 mufflers).
- The overall weight of the racecar shall be measured at the conclusion of an event with the driver in the driver seat, wearing complete racing apparel.
- Unlimited engine combinations must weigh 2900 lbs, all 368 cubic inches and smaller must weigh 2850 lbs.
- Ballasts must be mounted securely with minimum 0.5” bolts. Ballasts must be painted white with the car number written on it. No ballasts allowed in the driver compartment.
- Any driver that finishes on lead lap and have competed in the prior two weeks competition may protest another driver that finishes in front of him or her. All protests must be submitted in writing within 15 minutes after completion of race. Once the protest has been initiated the protest cannot be recalled. All protests must be made in cash only and must be given to the appointed track official. All protesting drivers may be accompanied by one additional person. Protested drivers are allowed two additional people to aid with removing of protested parts. Teams are allowed 1 hour for removing any components except in the case a rod and piston need be removed in which 1 hour 30 minutes will be allowed. All teams are responsible for having tools necessary for disassembly. If components cannot be removed within allotted time the protested driver will be disqualified.
- Section protest – $250.00, $25.00 goes to track – Driver may protest suspension, engine, transmission, or fuel. If fuel is protested laboratory fees will be taken from protest fee. Protests may be anonymous, however, only protesting driver may be present.
- Complete protest - $425.00, $50.00 goes to track – Complete vehicle may be inspected, only one head may be removed, protesting driver chooses which side. If fuel is protested laboratory fees will be taken from protest fee. Protests may be anonymous, however, only protesting driver may be present.
- If protested driver is found legal, protest monies will be issued to protested driver less fees.
- If protested driver is found illegal, protest monies will be returned to protesting driver less fees and penalties will apply.
- Violations – First offense, Loss of points and winnings for current night. Second offense loss of points year to date and suspension up to four weeks in which decision will be made by track director.
- Any driver may protest a total of 2 times per season. A driver may only be protested by another driver a total of 2 times per season.
- SOS has the right to protest any driver at any time in which a $50.00 teardown fee will be given to protested driver if found legal.
- All decisions will be made by SOS officials and all decisions are FINAL.
- Any top four finishing driver may have their carburetor claimed by another driver finishing on the lead lap behind them for a fee of $500.00 or swap. Claimed driver has decision for cash or swap. Claiming driver must have competed for the prior two weeks of competition at SOS without disqualification. Claim must be submitted before leaving the race surface to an SOS official. Claimed driver is responsible for removing own components and must not leave the tech area until claim is complete. Drivers may be claimed a total of three times per season. If claim is denied penalty will be loss of points year to date and loss of current night winnings and will not be able to claim the remainder of the season. SOS has the right to claim after the third claim has been met.
- Claiming drivers will not be eligible to claim again for a minimum of two weeks and must compete a minimum of two consecutive events at SOS in class claiming, and achieving a top four finish in an “A” Feature main event.