Hobby Stock Car Series

Hobby Stock is an entry level class with NO performance parts, suspension modification, or enhancements to the car. 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 warrant 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.


Open to any American made passenger CAR with a wheel base of 104 - 115 inch wheel base. NO PICK-UP TRUCKS, TRUCKS, OR CONVERTIBLES.

1. SUSPENSION: No modifications to the suspension, must remain 100% stock. NO aftermarket replacement springs or shocks. Shocks and springs must be mounted in stock location. No weight jacks of any type.

2. STEERING: Must be stock with no modifications.

3. WHEELS & TIRES: Wheels must be made of steel. NO magnesium or aluminum wheels. Maximum width of wheel is 8”. Maximum tire width is 8”. Any G-60 15 tire marked IMCA.

4. TRANSMISSION: Automatic or standard transmissions. Automatic transmission shall have working converter. NO bump start or pump valve. Standard transmissions 10 ½ “ or 11” stock clutch assembly with steel fly wheels. NO aluminum flywheel. Steel bell housing recommended or steel trans cover recommended.

5. COOLING: Stock radiator in stock location, radiator bracing permitted, no larger than 1 ½ to 1 ¾ tubing. The entire radiator bracing no wider than the stock bumper bracket horns. Tubing may run horizontal from the main cage to the front bumper horn forward of the radiator with parallel tubing to the frame.

6. BODY: Must be stock appearing with all glass, plastic and fabric materials or flammable material removed for safety purposes. Fenders may be cut 4” to allow for tire clearance with no sharp edges. Interior metal shall be removed to allow for door bars, floor pan, firewall, and rear bulk head area shall be covered with sheet metal. Bumpers shall be stock mounted and be no wider than the width of the car and must be in stock location and standard height.

7. ROLL CAGE: ROLL CAGE/DOOR BARS-CAGE WILL BE SAFE TO THE SATISFACTION OF THE TECHNICAL INSPECTOR. ALL BARS MUST BE OF 1 ½” x 120 or 1 ¾” x .095 minimum. Roll cage padding required. 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 approximately 45 degrees angle 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. Three left side and right side horizontal door bars are required (same material as cage). These bars must be attached by a minimum of two vertical bars of the same material. Two (2) bars angled from top of cage to extend past rear axle to frame rail.

8. FUEL TANK: Tanks must be 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 the car and have a securely fastened cap. A capacity of 15 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. Fuel line must have shut off valve clearly marked (FUEL) within driver’s reach. Fuel line must pass from rear bulk head to the fire wall through metal tubing secured to the interior floor.

9. BATTERY: May be relocated to the rear trunk area of the car. Battery must be securely held down with battery box. Battery disconnect switch must be installed, clearly marked (BATTERY).

10. ENGINE: Any car not starting during tech is disqualified. Underslung headers ok. 4412 carb or stock induction, no single plane manifolds, all engines must have a vacuum port for tech.

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

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

SEAT BELTS/HARNESS: Only approved racing specific belts are allowed. Lap belt must be 3” side. Shoulder harness must be 1 ½” wide. Crotch strap mandatory belts must be securely mounted with grade five bolts with minimum 3/8” diameter. 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 2009 or newer date. ALL BELTS MUST BE SECURED TO THE ROLL CAGE ONLY.

12. RACE FORMAT AND RULES REGARDING PROCEDURE: A Pill Draw, assassinated 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 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. Cars 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 results 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 its 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 din with at the pit gate.

POINTS: 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.

13. NUMBERING/LETTERING: Must be a minimum of 4” wide x 18” tall per character, placed on both sides of car, as well as on the roof. Must be clearly visible to scoring tower, with no obscene or offensive labeling.


YELLOW FLAG - 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 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 results 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 fro bringing out the yellow flag. This will be 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.

BLACK FLAG - PLEASE EXIT TRACK IMMEDIATELY. 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. 

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.

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.