Stock Car Series
General Rules, 2013 season

The Rules contained herein supersede any previously published safety and conduct rules. The rules set forth herein are designed to provide for the orderly conduct of racing events and establish minimum acceptable requirements for these events. These rules will govern the condition of all events and by participating in these events, the participants are deemed to have complied with these rules. No express or implied warranty of safety shall result from the publications of or compliance with these rules and/or regulations. They are intended as a guide for the conduct of the event. They are in no way a guarantee against injury or death to participant, spectator or official. The race director or promoter is empowered to impose or permit reasonable deviations from any specification herein or impose further restrictions that, in his opinion, do not alter the minimum requirements. No expressed or implied warranty of safety will result from such alterations of the specifications. Any interpretation or deviation of the rules is left to the discretion of the officials. The decision of the officials is final.


SEATS: Only an approved racing seat may be used. Headrest or high backed seat mandatory. Seat must be secured to roll cage. Headrest must be secured to roll cage.

HELMET: Snell Institute approved SA95 helmets or better only. No exceptions.

NECK BRACE: Required.

FIRESUITS: One or two piece approved fire suits required.

GLOVES: Approved fireproof gloves mandatory.

HEADSOCK: Fireproof headsock or skirt headgear mandatory.

SHOES: Approved fireproof shoes mandatory.

FIRE EXTINGUISHERS: Required in each pit with car number boldly placed on unit.

SEAT BELTS/HARNESS: Only approved aircraft type or racing specific belts are allowed. Lap belt must be 3” wide. Shoulder harness must be 1 ½” wide. Crotch strap mandatory. Belts must be securely mounted with grade five bolts with minimum 3/8” diameter. NO EXCEPTION. Eyebolts must be one piece with 3/8” shank minimum and not formed and welded hook. Belts will be replaced every two years. Belts must carry 2001 or newer date. ALL BELTS MUST BE SECURED TO THE ROLL CAGE ONLY.

ROLL BAR PADDING: Required. Driver cage area and driver’s side door bars. Consult with technical inspector for assistance.

WINDOW NET: Approved window net required on driver’s side window.

PIT SPEED: 10 MPG max. $25 fine and 5 Championship Point penalty for speeding in the pits.

1. American made passenger car produced from 1955 to present allowed. Car must be stock unless otherwise specified.
2. Minimum wheelbase will be 105 inches.
3. No 4 wheel drives, sports cars, convertibles or stations or pickups.
4. Car must weigh 3000 lbs. with driver and all the driver’s equipment. Driver must not exit cockpit prior to weigh in.
5. Swapping engine OK if bolt-in replacement. Example: A 327 to a 350 Chevy.
6. The chassis, engine and transmission must be the same make (Ford to Ford, GM to GM, etc.)
7. Any OEM production standard or automatic transmission acceptable. Automatics may be direct coupled. Clutches must be of automotive design and slip enough to safely and smoothly accelerate and maneuver car in pits.
8. All glass and flammable materials must be removed.
9. 5” minimum spring diameter.

1. Body (hood and roof panels included) must be 22 gauge steel or aluminum. Fiberglass hoods or roof panels OK. After market bodies OK. Body must be painted, lettered and numbered to the satisfaction of the officials. No Junk. One or two digit numbers only (00 to 09 and 1 to 99, X and XX are OK). Make you numbers large enough to be read easily from the scoring booth.
2. Body must be securely mounted. Must be welded or bolted. If welded, welds will be minimum 3” long and minimum 7” apart.
3. Nerf Bars: 1” square, 1” round or 1 x 2 rectangle bar allowed. Bar may not extend more than 1” outside body. Ends of bar must taper back and may not have any sharp edges.
4. Fenders may be cut to give 3” of clearance above the tire. No sharp edges.
5. Bumpers required front and rear. After market front nosepiece allowed.
6. Hood must be secured at all 4 corners.
7. Rear spoilers allowed. Side panels and wings OK.
8. NO INAPPROPRIATE LETTERING ON CARS. Remember, this is a family sport. 

1. Steering box must be stock to the make of car. GM to GM, etc. Quick steer speed-up boxes allowed (and recommended).
2. Weight jackscrews allowed. No suspension device or housing shall protrude through any panel. No cockpit operated suspension devices are allowed. After-market tie rod ends OK. OEM upper control arm may be modified or replaced with after market tubular type. Must be steel.
3. One shock absorber per wheel.
4. Larger than stock studs and lug nuts are allowed and recommended. 5 studs and nuts per wheel.
5. Frame must be stock OEM from 6” in front of front spring pocket to 6” behind front spring pocket. Left rear spring pocket may be relocated. Spring cans with weight jacks may be added. Leaf spring sliders OK. No cockpit adjustable suspension or brake components. 1 spring and 1 shock per corner maximum. Leaf spring cars may have fabricated frame behind front spring perch. Unibody cars may have frame connectors. No coil overs, 5” spring minimum.

WINDSHIELD SCREEN: Must have screening no smaller than ¼” and no larger than ½” mesh to protect driver’s seated position. Must mount securely in window frame. No less than 1/8 x 1” strap OR five 3/8” rods placed on driver’s side, equally spaced.

FUEL TANKS: Tanks must be moved from their original position and placed between frame rails. Tank may not extend lower than 2” below bottom of frame rail. Tank must be mounted with a minimum tie down of 1/8” x 1” strap iron. Tanks must be vented to the underside of car and have a securely fastened cap. Tank must be of equal strength to a standard jeep can. A capacity of 22 gallons is the maximum. Fuel cells are recommended. No rubber filler pipe connections. The tank must be protected by a steel tubular bar (1” minimum) to the rear of the tank. Firewall between driver and tank is mandatory.

SEAT: Must have racing type driver’s seat. Seat must be secured to the roll cage only. Headrest mounted to roll cage mandatory. High back seat recommended.

SHUT-OFF VALVE: ¼ turn to off on the fuel line (PAINTED RED) within the driver’s sight and reach is mandatory.

RETURN SPRINGS: All cars must have two throttle return springs. METAL ONLY.

1. Hoosier “Dirt Boss” tires are the specified tire at Marysville Raceway Park, Grooving allowed. 8 ¼” maximum tread width. No tire softening compounds. 
2. 8 ½” maximum wheel width. Stock wheels must be double-centered. Aftermarket steel wheels allowed.

BATTERY/BINDING COMPONENTS: Must be SECURELY mounted with hold-down clamps and have a protective cover to contain acids. Marine box required if battery is in driver’s compartment.

BRAKES; Must have working brakes on three wheels. Disc brakes OK. Calipers and rotors must be OEM. . Aftermarket pedal assemblies are ALLOWED. Must be accessible for inspection. 

1. Full cage roll bars required with full loop from frame over driver. These bars to be connected on top and both sides by another bar. Cage will be within 3” of the roof of the car and within 6” of sides of top. In back loop, running from top right to bottom rear at approx. 45 degrees there must be a bar. All bars will be safely welded together and/or bolted or welded securely to the frame with no less than 7/16” bolts. Must be welded to frame or sub frame filler on unibody cars. Gusseting on all bar junctions recommended. Mandatory ¼” hole to be drilled in driver’s door bar for inspection. You may be asked to drill a ¼” hole at any point, at any time, in the cage for inspection purposes. ALL BARS MUST BE OF 1 ½” x 120 or 1 ¾” x .095 minimum.
2. Three left side and minimum two (three recommended) right side horizontal door bars (“X” bars OK on right side) are required (same material as cage). These bars must be attached by a minimum of one vertical bar of the same material (2 recommended).
3. Front horizontal cage loops allowed inside body in front of radiator. Mounting radiators to a bar with stock mounts removed OK. Two bars angled from top of cage to extend past rear axle to frame rail. 

1. Chassis and engine must be the same manufacturer.
2. Solid motor mounts allowed. #1 spark plug must align with, or be in front of, the centerline of the top ball joint. Cars with engines set back beyond this rule may not exceed 53% max rear percentage.
3. Cast iron heads and block only. 23 degree heads plus or minus 2 degrees
4. Not used
5. Any piston.
6. Roller rockers OK. 

1. Any manifold, cast or aluminum is allowed.
2. One carburetor only. Stock as delivered 500 CFM Holley 4412. No changes to internal surface of carburetor. Carburetor will be checked by track approved “Go-No Go” gauge. Top & bottom throttle plates and shafts may not be altered. 
3. Maximum venturi diameter is 1 3/8”.Venturi must be concentric 
4. 2 barrel carburetors only. OEM Efi allowed. ECU may be reflashed or replaced with aftermarket unit
5. Carburetor must mount to manifold without modification to manifold or mounting flange.
6. Carburetor adaptor will not exceed 1” in height from stock location. Blending adapter to manifold OK. 
7. Exhaust headers OK. 
IGNITION: Stock as delivered or aftermarket (i.e. crankfire, dual point or stock) OK. magnetos, after market coils OK, distributors may be locked out for advanced system.

FUEL: Gasoline or racing gasoline OK. Alcohol ok, no Nitros

MUFFLERS: Mandatory. Cars must meet 95 db @ 100 feet.

No 2 way radios, Raceceivers recommended 



A Pill Draw as designated by the Marysville Raceway Park officials will determine the heat race starting line-ups.

Heat race format will be 8 laps, up to 10 cars per heat race. Track officials will determine how many cars will transfer to main event, depending upon car count that evening.

“B” Main Event to be scheduled when necessary to determine the final starting positions in the “A” Main Event field. Race will be 10 laps or less, as determined by track officials.

“A” Main Event will be 20 cars, 20 laps.

All qualifying cars will be listed in order of start for each event on Pit Board prior to race.

All cars must start WITHOUT ASSISTANCE from the staging area for every initial start in every event. Car requiring assistance on initial start prior to green flag start must go to the back of the pack. On board starters are required. NO EXCEPTIONS.

1. Front row cars will be side by side at the turn 4 cone. NO EXCEPTIONS. 
2. Two original starts will be attempted.
3. A jumped start will result in one or both front row starters penalized ONE ROW for jumping the start at the discretion of the flagman.
4. A single file original start may be imposed by the flagman after two original starts have been unsuccessful.

RESTARTS: The green flag will be displayed when the leader is at the turn 4 cone. You may pass only AFTER passing the turn 4 cone. NO EXCEPTIONS.

The promoter (only) may conclude a race prior to the completion of it’s scheduled distance.

A driver may NEVER switch cars during the course of a Marysville Raceway event. A driver MUST compete in the car he has signed in with at the pit gate.


MAIN EVENTS: 1ST - 50 POINTS, 2ND - 47 POINTS, 3RD - 45 POINTS, 4TH - 43 POINTS, 5th - 41 POINTS. Then a one point drop through the entire entered field, assuming they compete in their scheduled events. A 5 point minimum for appearing with a car. You must start an event to earn a finishing position and the points associated with it.


YELLOW-CAUTION, MAINTAIN POSITIONS. No pit crews are allowed on racetrack during yellow flag. If you stop on a yellow, you will go to the back of the lineup, unless a safety issue is recognized by an official. Any car that receives two charged yellows in any one race will be black flagged for the remainder of that race, but he/she will receive starting points is earned and/or any position gained the finish of that race. Being charged with a red and a yellow flag will have the same effect as two yellows.

A charged yellow will be when a car brings out the yellow flag by their own actions and not as the result of trying to stop to avoid another incident on the track. If a car brings out the yellow but continues (i.e. car does 360 but keeps going), that car will be sent to the back for bringing out the yellow flag. This will not be considered a charged yellow flag for purposes of the two yellow rule.

Laps run on a yellow will not be counted and will revert back to the previous lap scored.

RED FLAG - STOP, DANGEROUS CONDITION. Any car involved in a red flag will go to the back of the pack on the restart.

On a red flag, all work is permitted in the designated red flag work area only. To hold your position on a restart, your car must stay on the track. If you go to the pit area, you will lose your restart position. If a car is not ready in a timely manner after a red they will lose their position and restart the race at the rear of the line-up.


Rough driving and/or unsportsmanlike conduct, loss of muffler or exceeding sound level, excessive smoking or other condition deemed a hazard to themselves or others will be black flagged. Car will be allowed to return to the race track after repairs have been made, during the next caution flag, but will be put to the rear of the field.

It is our intention to have a safe and fair environment. Please adhere to the rules herein. Approval of a vehicle shall only mean that the car is approved for participation. Approval does not mean the car is mechanically safe or sound. Marysville Raceway Park, it’s staff or management will not be liable for losses due to any mechanical failure, driver error, nor for any losses, injuries or death resulting from same.

The top four winners of the “A” Main Event will exit to the tech area immediately following the race. DO NOT GO TO YOUR PIT AREA. Do not go for water. All points for the night will be deducted. If you are not sure, go to the tech area first. No crew members permitted within 20 feet of the car during tech inspection. Any violations will result in a $25 fine and deduction of 5 championship points.
In the event of a points tie at the end of the season, the champion will be decided by the following tie breakers.
1. Most main event wins
2. Most heat race wins
3. Lowest total finish average

AMB Transponders are MANDATORY, either direct powered or rechargeable.