Mini Stock 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 results from the publications of or compliance with these rules and regulations. They are intended as a guide for the conduct of the events. 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. Head rest 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 recommended.

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 EXCEPTIONS. Eyebolts must be one piece with 3/8” shank minimum and pre-formed and welded hook. Belts will be replaced every two years. Belts must carry 2005 or newer date. ALL BELTS MUST BE SECURED TO THE ROLL CAGE ONLY.

ROLL-BAR PADDING: Required, including 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 MPH. $25 fine and 5 championship point penalty for speeding in the pits.

WEIGHT RULE: 2050 lbs. With driver and all drivers’ equipment. Driver must not exit cockpit 
prior to weigh in.

TYPE OF CAR; Any American or foreign production economy sedan, coupe, station wagon or pick-up. No 4-wheel drive, rear or mid-engine cars. Maximum wheelbase of 100.5”. Exceptions to the wheel base rule may be made on some stock mini-trucks that may exceed the 100.5” limit.

BODY/CHASSIS/PAINT/NUMBERS: Minimum 22 gauge steel or aluminum body, hood and roof panels. After market bodies OK. Must be firmly attached to secure mounting points. After market nosepiece of plastic, fiberglass or rubberized materials OK. Body panels will be painted and numbered to the satisfaction of race officials. NO JUNK. Large and distinctive numbers easily read from the scoring booth will be required. Number on roof, left and right sides required. One or two digit numbers only. Example: 1 through 99 and 00 through 09, X and XX OK. No inappropriate lettering on cars.
1. Body may be altered in trunk area for fuel tank. Fuel tank must be behind rear axle. Fuel cell recommended.
2. Bumper may be replaced by any bumper no wider than the outside of the tire front & rear. NO SHARP EDGES. NO EXCEPTIONS. Wrap around bumpers only.
3. All body panels may be gutted. Doors will be safely welded or bolted shut. No roof openings.
4. Fender wells may be cut for tire clearance. No sharp edges.
5. Firewall and floorboard will be stock and in the stock locations.
6. Glass and flammables will be removed.
7. Rear deck lid spoiler OK. Maximum vertical height of 6.5” measured from deck lid.

BRAKES: Must have working brakes on at least 3 wheels. No cockpit adjustable proportioning valves. Disc brakes OK. No exotic metals. Calipers and rotors must be O.E.M. After market cockpit adjustable pedal assemblies are NOT allowed. Locking rear end does not constitute one brake. No cockpit adjustable devices. NO TOLERANCE..

DRIVE TRAIN: 1. On rear drive cars: a drive shaft safety hoop will be required 4” behind front u-joint. Hoop must be .25” thick - 1.50” wide steel strap.
2. Flywheels and clutches: After market clutches or fly wheels OK. Must be steel. Clutch must be operable at ALL times.
3. Stock automatic or manual transmissions allowed in stock location. All gears forward and reverse must be in working order.

REAR END: Stock type only. No exotic or quick change rear ends. Locked rear ends Ok.

ENGINE/CARBURETOR/IGNITION: Water cooled, stock as delivered in line 4 cylinder of 2600 cc’s or less. Crossbreeding of head block and internal parts is allowed if they can be bolted together without alteration. Engine same manufacturer as chassis. Dual or single overhead cams ok, 4 valves per cylinder ok. No turbo chargers, no superchargers. NO EXOTIC METALS. 
1. One stock 2 barrel 500 CFM carburetor is allowed. Stock 4412 is the maximum carb allowable. Oem electronic fuel injection OK. ECI unit may be reflashed or an aftermarket ECI may be used. Carburetor will be checked with Track Go-No-Go Gauge. If your carb is not a stock 4412 have it approved by the track before racing
2. Carburetor adapter will not exceed 2” in height from stock location. Blending adapter to manifold OK. Blending limited to 1.5” down from stock carburetor base.
3. Ignition will be stock or aftermarket. No magnetos. Distributors may be locked out for advanced system. After market coils allowed. Any type distributor may be used (i.e. crankfire, dual point or stock).
4. CAMS: Cam timing adjustment devices OK. Any hydraulic or solid camshaft may be used with any type of engine, no matter what make or model.
5. Not used
6. Mufflers mandatory. 95 db at 100 feet.
7. Aluminum intake manifold OK. Exhaust headers OK. Aftermarket or stock headers allowed.
8. Cockpit exhaust OK if shielded (by approved cockpit sheet metal. See tech inspector) from driver and exits behind driver. No exhaust may invade driver’s side of cockpit.
9. Not used.
10. Any stock or after market valve springs and retainers allowed. No exotic metals.
12. Firewall and floor pan must be in original stock position to the rear axle. No engine setback allowed.

FUEL SYSTEM: 1. Electric fuel pump OK. May not be glass or cockpit mounted. Kill switch required from outside car. Driver’s side near dash. PAINTED WHITE.
2. Fuel cell optional and recommended. Gasoline or alcohol only. Racing gasoline OK.
3. Firewall required between fuel tank and driver. NO EXCEPTIONS.
4. Must have a ¼ turn shut off valve on the fuel line accessible to driver, and painted red. Must be in plain sight to right of driver.

SUSPENSION: 1. One shock or strut per wheel. Stock NON-ADJUSTABLE replacement shock, struts and springs are OK.
2. No weight jacks, adjustable struts or shocks, traction or ladder bars of any kind allowed.
3. Inner panel from strut tower back must remain intact.
4. From strut tower forward may be removed.
5. Quick or speedup steering allowed. (Recommended)

TIRES/WHEELS; 1. Tires not to exceed 8” in tread width.
2. Hoosier “Dirt Boss” is the specified tire at Marysville Raceway Park. 
3. No slicks, racing tires or racing recaps allowed. Tire grooving allowed.
4. Steel wheels only.
5. Maximum width of 8” bead to bead.
6. Any questions on other tire eligibility should be directed to the promoter or technical inspector.

1. Full cage roll bars required with full loop 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 .25” hole at any point, at any time, in the cage for inspection purposes. ALL BARS MUST BE OF 1 ½” x .095 or 1 ¾” x .095 minimum. 
2. Three left side and minimum two (three recommended) right side horizontal or door bar (‘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 additional bars angled from top of cage to extend past rear axle to frame rail required.
4. 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. The Promoter may add cars (more than 20) to the “A” Main Event starting line-up to avoid running a “B” Main Event with 6 or fewer cars.

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 result in one or both front row starters penalized 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 EVENT: 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. 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 if earned and/or any position gained at 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 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.

If you are asked to report to post-race inspection, report to the tech area immediately after the race. DO NOT GO TO YOUR PIT AREA. All points for the night will be deducted. If you are not sure, go the tech area first. No crewmembers permitted within 20 feet of car during tech inspection. Any violations will result in a $25 fine and deduction of 5 championship points.

AMB Transponders are MANDATORY, either direct powered or rechargeable.