Miller, SD
Miller, SD


WISSOTA Rules will be applied at Miller Central Speedway. All Drivers are presumed to know and abide by the rules. Any ingnorance of the rules will not be tolerated. Super Stocks, Midwest Mods, Street Stocks, and Late Models all are WISSOTA sanctioned and follow the WISSOTA rulebook, please refer to their website for the rules. Do you want to attempt a person’s success? Then quickly come in the book of dead along with gain!

Pump-N-Pak Purestocks

RULE BOOK DISCLAIMER: The rules and /or regulations set forth herein are designed to provide for the orderly conduct of racing events and to establish minimum acceptable requirements for such events. These rules shall govern the condition of all events and, by participating in these events, all participants are deemed to have complied with these rules. NO EXPRESSED OR IMPLIED WARRANTY OF SAFETY SHALL RESULT FROM PUBLICATIONS OF, OR COMPLIANCE WITH, THESE RULES AND/OR REGULATIONS. They are intended as a guide for the conduct of the sport and are in no way a guarantee against injury or death to a participant, spectator or official.
The race directors shall be empowered to permit minor deviations from any of the specifications herein or impose any further restrictions that in his/her opinion do not alter the minimum acceptable requirements. NO EXPRESSED OR IMPLIED WARRANTY OF SAFETY SHALL RESULT FROM SUCH ALTERATION OF SPECIFICATIONS. Any interpretation or deviation of these rules is left to the discretion of the officials. THEIR DECISION IS FINAL.
The fine for illegal parts will be $250, 30 day suspension and loss of points at Miller Central Speedway. If found to be illegal after the track point season has ended, loss of all points at the track will still apply. 

1. Any American made car with factory specification of 112 inch wheel base.
2. No vans, trucks, station wagons or convertibles.
3. Minimum weight with driver: 321 cu. in or less = 3400 pounds, 322 to 367 cu. in. = 3600 pounds; over 367 cu. in. = 3800 pounds. Weight must be painted on top of left front fender, visible by scale operator.
4. No reinforcing, cutting apart, welding or modifications of anything on the vehicle is allowed except as specified.
5. All glass and burnable materials must be removed.
6. Hood may be gutted.
7. Front wheel wells may be removed.
8. Doors may be gutted for door bars only.
9. No gutting of rear wheel wells, steel interior panels or trunk floor (see K-6, FUEL CELLS)
10. All doors must be welded shut.
11. Engine must remain in original position.
12. A driveshaft hoop is required and must be located 6” to 12” behind front u-joint. The hoop must be made of 1/4“ 2” steel and, if bolt-in type used, must be mounted with graded hardware. Hoop must be 360 degrees around shaft. NO chain allowed. Driveshaft must be painted white.
13. Rear bumper must be stock mounted and tied to rear fenders with straps.
14. No gutting of bumpers — front or rear.
15. A short piece of 3/8” chain must be bolted through a hole in the bumper and a hole in the frame to prevent the bumper from falling off. This applies to both front and rear bumpers.
16. Any stock front bumper is OK. You may replace your factory shock absorber mount with pipe no larger than 1 3/4″ .095 tubing and brace any bumper using the same material no wider than 48″ behind the bumper. Straps from front bumper to fender are allowed and recommended.
17. Body must match frame and wheel base.
18. Rub bars may be used on the sides of the car, but must be mounted to the body. They can not be tied to the roll cage. Rub bar maximum 2″ tubing with tapered ends.
19. Sheet or roll plastic or an aftermarket nosepiece may be used but MUST be mounted ABOVE the stock bumper. Bumper may be covered but bottom must be able to be seen without getting under the car. NO plastic allowed below the bumper.

1. A six (6) point roll cage is mandatory: one post by each windshield post and two behind the driver with all four connected at the top with a roof hoop. You must have an angle brace from the driver’s front of the roof hoop to the right rear of the roof hoop. You must have an angle brace running from the upper right corner to the lower left corner behind the driver. The two back bars must run from the top left and top right of the roof hoop to the rear of the car. We recommend a protective bar running from the front left cage post forward and down to the frame to protect the drivers foot area. There should be a minimum of 3” from the top of the cage to the top of the driver’s head. See diagram regarding roll cage gussets.
2. Main cage must consist of 1.75 inch O.D. tubing, with a wall thickness of at least .095 inch.
3. Minimum of four (4) 3/8” windshield bars.
4. Minimum of three (3) door bars on the left side.

1. Each driver must have a fire extinguisher in his/her pit.
2. Aluminum racing seat only. No fiberglass seats. No composite material seats. Seat must be mounted in stock location and not set back.
3. A tail light in the rear window is required and must be on at all times.
4. Must have 5-point racing harness. Seat belts must consist of a 3 inch lap belt and double 3 inch shoulder belts that release with one mechanism.
5. A driver’s side window net is mandatory. Window net must be mounted with solid mount at the bottom of the window and latch at the top. Latch must be readily accessible by both driver and safety personnel.
6. Shoulder belts should be mounted a minimum of 6” lower then driver’s shoulders to keep the driver down in the seat in case of a rollover.
7. Shoulder belts cannot be more than 5 years old.
8. Helmet must have at least SA2005 rating. Helmets with a Snell SM rating are not acceptable.
9. MUST have fire retardant driving suit.
10. Neck brace made of a fire resistant material is mandatory.
11. Fire resistant gloves and shoes are highly recommended.

1. Stock cast two barrel intake ONLY. No porting, polishing or gasket matching!
2. No aluminum intakes. No carb adapters or spacer plates.
3. No porting of heads or intake or exhaust manifolds.
4. Flat tappet hydraulic camshafts only. No roller cams or roller lifters allowed. No mushroom or step lifters allowed. No machining permitted to install cam or lifters. Must be able to remove lifter from top of lifter galley at any time. No truing of lifter bore.
5. Stock log type manifolds only. No center dump exhaust manifolds. No Vortec Manifolds
6. No double hump heads. No Vortec heads (Casting number NOT allowed: 186, 462, 461, 461x, 492, 432, 041, 040, 370, 10239906.)
7. No headers, NO roller cams, NO roller tip rockers, NO roller rockers.
8. Heads must match engine. For example: 305 heads on 305 block.
9. Stock pistons. No flat-top pistons in 400 cu. in. engine. No domed pistons. Cast pistons with 4 valve reliefs ONLY – no forged pistons, no Keith Black pistons. No floated or bushed rods allowed.
10. Piston must sit below deck of block.
11. Head cannot be angle milled.
12. Stock stroke. Crank must match block. No offset grind.
13. Rods must match block. No lightening, grinding, knife edging or polishing of any type.
14. Balancing is allowed.
15. Stock two-piece balancer only.
16. No aluminum other than stock for that engine. No aluminum water pump on Chevy engine.  Aluminum Pulleys are allowed.
17. Valve seats may be ground no further then 1/4 inch below top of seat. Valve must match head being used.
18. Stamped steel rockers only. No stud girdles. No guide plates. Valley pans allowed.
19. Valve springs must be stock diameter for heads being used. No helper springs. No beehive springs
20. Stock appearing oil pan. Pan will go with claim.
21. Maximum engine compression allowed is 9.5:1.
1. One 2-barrel carburetor only.
2. No front-bowl Holleys. No Marine carbs or intakes.
3. All carburetor components must be STOCK.
4. No milling or grinding allowed.
5. Choke can be removed but not the air horn.
6. Must have stock measurements.
7. No electric fuel pumps.
8. Fuel must be pump gasoline only. 10% ethanol-enriched gasoline may be used. No alcohol, no nitrous oxide or nitro, no nitrous devices allowed. No methane or propylene oxide allowed.
9. Central Dakota Pure Stock restrictor plate required. Total thickness of gaskets and plate (from intake to bottom of carb) cannot exceed 5/8″. Gaskets must be OEM replacement gaskets. NO plastic, wood, aluminum or any other foreign material or homemade gaskets.
10. Gas pedal, including the use of a racing pedal, must be mounted in stock location on the firewall.

1. Ignition must be either point system or stock electronics (HEI). No super coils.
2. No multiple spark boxes (like MSD).

1. You are allowed to have 2 copper radiators or 1 aluminum radiator.
2. Radiator (Stock or Aluminum) must be mounted to Stock OEM radiator support and remain in original position and be operable. Some fabrication or reinforcing of mounting brackets will be allowed as needed for a safe installation. The portion of the radiator support that extends outside the frame rail may be replaced with pipe to tie the fender to it. The portion inside the frame rails must remain stock.
3. Extra cooler may be used if using a copper\brass radiator. It must be mounted inside the car and shielded from the driver. Absolutely NO Aluminum radiators in the rear, stock or not

1. Stock 3-speed automatic transmission only. Must be fully functional with three forward gears and working reverse. No lightening or removal of internal parts allowed.
2. No powerglides allowed. No straight stick transmissions allowed.
3. Only 350 and 400 transmissions allowed in GM. Transmissions in other brands subject to approval.
4. Transmission is subject to teardown / protest.
5. Stock diameter torque converter only. (Stock to transmission being used.)
6. No modified torque converters.
7. Posi-traction or welded rear ends are OK. 4:11 gears or less. Aftermarket mini spool allowed. No full spools allowed.
8. No inner marriage of rear ends and transmissions.

1. The battery must be moved inside the car and must be covered and securely fastened. (NO TARP STRAPS).
2. One battery only — must be 12 volt.

1. Brakes must be factory stock including master cylinder.
2. Drum brakes on rear of car only.
3. All cars must have 4 working brakes at all times.
4. Brake pedal must be of stock length for the make and model of car and must be stock mounted to the firewall.
5. No altering of suspension or steering. Steering shaft with u-joints or slip joint is OK. All suspension parts must match frame.
6. No racing shocks. NO filing of numbers off shocks. Bilstein, Carrera, etc., “stock replacement shocks” are NOT stock shocks and are, therefore, not allowed. No “helper” springs on shocks (coil-overs).
7. Front springs must be at least 5″ in diameter and at least 12″ in length.
8. Springs must be stock mounted and rear springs must have pigtails on both ends.
9. All springs must be tight in the pocket without the use of any shims or adjusters. No sliders on leaf cars. No multiple holed shackles.

1. Fuel tanks must be moved into the trunk area. Trunk floor may be gutted for fuel cell BUT no more then 2 inches around cell. If fuel cell protrudes below trunk floor, a fuel cell guard must be in place. This guard will consist of a piece of tubing, minimum of 1 1/2 inches in diameter, 1 inch below the cell and from frame rail to frame rail. The bottom of the fuel cell can not be lower than the bottom point of the stock frame rail. Cell must be mounted to the roll cage.
2. Maximum capacity of fuel tanks not to exceed 10 gallons. Fuel CELLS may be larger.
3. There must be a firewall between the driver and the fuel tank.
4. Fuel tank must be securely mounted using a minimum of two (2) 2” steel straps.
5. If a fuel cell is used, it must be in a metal container.

1. DOT (street design) or used racing tires are allowed.
2. DOT tires with no wider than 8” tread width allowed, with P255/60/R15 being the largest tire allowed. No series less than 60 allowed. Tires must be Passenger Series – no grips, snow tires, or truck tires. No defacing of tires. No grooving or siping of street tires.
3. Current or former racing tires allowed on WISSOTA Street Stocks or MW Mods, or IMCA Stock Cars or IMCA Modifieds are the racing tires allowed (Hoosier E-mod, Hoosier W35, G60, etc). Tires must have 6/32 of an inch or less tread depth prior to a race – no tolerance. Racing tires may be grooved and siped. No late model or sprint car style tires allowed.  Tech officials have final say if tires are legal – if in doubt, ask ahead of time.
4. If a racing tire is used for one tire, matching tires must be used on all four corners.
5. 14″ or 15″ by 8″ Steel wheels. Chrome or white spoke allowed.
6. 15×8 inch racing style rims are allowed. Rim offsets must match on all four rims. No 1 inch offset rims. No beadlocks.
7. No wheel spacers.

This class is designed for stock street cars only. NO high performance or racing parts allowed on this car. Suspension, engine and drive train must remain STOCK. Any areas not covered in the above rules shall be left up to the discretion of the management. If in doubt — ASK. We will uphold the intent of the rules.

Cars must be neatly numbered using numbers from 1 through 99. Numbers must be at least 18” high and 10” wide with a body of 3”. Numbers must be painted on the door on both sides of the car and the roof. A 6” by 6” plate with the number painted on it must be placed in the front window and the rear window. All numbers must be of contrasting color to the car. Do not incorporate graphics into your number. Simple block numbers using the above dimensions and of a contrasting color are the easiest to read. Do NOT paint number on the rear quarter panels. Do NOT use shiny reflective or prismatic type decals.

All cars will be kept neat appearing. Tin hanging off cars and/or sharp edges will not be tolerated.


No driver currently licensed in a “higher class” by WISSOTA, IMCA, INEX, NOPA, ETC., will be allowed to participate in the Pump-N-Pak Pure Stock class.

ELIGIBILITY AND FEES: All race cars competing in the feature event are subject to being protested. Any driver competing in the feature event may protest providing his race car meets the minimum weight and is otherwise legal under the rules and he has registered his/her intent to protest with a track official prior to the start of the feature race and has tendered the required protest fee. The protest fee shall be $50 for either the top end or the bottom end or $100 for both. If after tear down, the engine is found to be legal, 75% of the protest fee will go to the protested driver and 25% of the fee will be retained by the track. If after tear down, the engine is found to be illegal, 75% of the protest fee will be returned to the driver who protested and 25% will be retained by the track.
PROTEST PROCEDURE: Immediately following the completion of the feature race, a track official will notify the driver of the relevant race car that his/her race car has been protested. The protested driver shall then proceed directly to the “claim area” where he will receive further instructions as to where the tear down will take place. A track official will be assigned to stay with the protested car until the tear down is completed.
SPECIAL PROVISIONS: Only the driver may protest. A driver may only protest one engine per race. Only the tech inspector has the final word on the legality of the race cars involved in the protest. No person shall prevent or interfere with the protest procedure. Only the driver and 2 pitmen from the protested car, the protesting driver and 1 of his/her pitmen and the appropriate track officials may be present at the tear down.
PENALTIES: If an engine is found to be illegal, the driver of the protested car will forfeit all points and money earned for the event at which the engine was protested and will serve a 2-event suspension. The 2-event suspension applies to both car and driver. Refusal of a protest will result in the same penalties as above. In the case of a protest refusal, the protest fee will be returned to the driver who protested. A second protest refusal by the same driver in the same racing season shall result in loss of all points and money earned for the event at which the engine was protested, a 4-event suspension for both car and driver and loss of all points earned year to date.

The fee to protest a transmission will be $100. The Eligibility, Procedure, Special Provisions and Penalties will be the same as the Engine Protest Rule.

There will be an engine claim of $200 plus exchange. The claim must be made within 5 minutes of the end of the feature event. The claim can only be made by the driver and the claim fee must be in US currency. The claiming driver’s engine must be in good, sound running order according to the track officials. In order to claim, a driver must be in the top 8 finishers, on the same lap as the winner and must not have been involved in causing a yellow during the feature event. The cars in the last two (2) places are ineligible to claim. The car whose driver is claiming must meet all rules and must weigh after the feature.
The claim includes everything except: carburetor, ignition, exhaust manifold, starter, water pump, fan belts and pulleys.
The refusal of a claim or the discovery of an illegal motor, transmission, clutch, intake, exhaust or carburetor will result in a 30 day suspension for both car and driver and the loss of all points and money earned that night, as well as all points year to date and a $500 fine. Suspension time must be served and fines must be paid before the driver is allowed to race again.



Contact Info

Miller Central Speedway
Mailing Address

804 West 1st Avenue

Miller, SD 57362


Track Address

1300 3rd Ave SE
Miller, SD 57362



Email: [email protected]

[email protected]

Photo Gallery

Connect with Us

Like our Facebook page to keep up with weekly updates and results!

Print Print | Sitemap
© Miller Central Speedway