Rules/Forms

1 1/4" minimum material diameter with wall thickness of [13 Ga.] .095". It fastens to the halo @ or in front of seat headrest. Out and down to top door bar or angle back to the top door bar or B bar that goes up to the halo One horizontal bar from extra bar to B bar. Does not have to be 1 1/4". All cars need one in 2024.

Above is the download for the required drivers decals for 2025. This has been updated as of 4/24/25. The last version graphics designers were not following the required size to the decals. This version now has the length and width for each decal. Drivers when getting your cars rewrapped please make sure your graphics guys uses this new download.

The newest decal on this download is for the WISSOTA Late Model Challenge Series. Drivers who plan on racing the series are required to have the challenge series logo placed next to the WISSOTA Logo. This new logo will replace the large sticker that was given when you entered the series. If this logo is not in your wrap you will be given stickers when you register for the race.

3/16/25 - The Snell SA2015 remain legal for this year, until the SA2025 is released.

3/23/25 - Drivers using the Manley Wissota H beam rods allowed P/N 14037w-8, your engine builder is allowed to machine the block for clearance only on these rods.

5/15/25 - All Classes (except Pure Stocks & Hornet)
* All shocks must be able to be collapsed by hand only all the way with no
rod showing.
* You are not permitted to release gas pressure from the shocks before
collapsing them.

2025

4/14/25 - Engine compartment covers cannot exceed past the mid plate and must be a minimum of 4 inches from door top to bottom.

5/9/25 - Shocks - Bulb style shock top build in hiems may be steel or aluminum. Body of shock must be steel.

2025

5/9/25 - Shocks - Bulb style shock top build in hiems may be steel or aluminum. Body of shock must be steel.

2025

3/23/25 - Drivers using the Manley Wissota H beam rods allowed P/N 14037w-8, your engine builder is allowed to machine the block for clearance only on these rods.

5/9/25 - Shocks - Can not have bulb tops or extended tops. Can have aluminum removable hiems. Must be steel body

2025

3/23/25 - This was missed when going through the rule book for 2025, Page 77 Letter A - Top front fenders & rear quarter panels MAX. 4" showing outside of hood and trunk both sides. Minimum hood & truck width is 60"

5/9/25 - Shocks - No aluminum hiems. No bulb tops. Must be steel body

7/15/25 - Effective August 4, 2025, the following rule will apply to all drivers running an Open Motor:

Adapter Plate: The maximum total thickness between the carburetor and intake manifold—including gaskets and adapter—may not exceed 1 3/8 inches.

Additional Devices: No devices of any kind may be added inside the intake to increase or redirect airflow.

2025

6/10/25 - Duratec engines may remove the WISSOTA spacer p/n 135-1955. If removed you must use the unaltered canton spacer p/n 85-040. WISSOTA will continue to review these changing during race season.

7/15/25 - Holley 4412 carburetor may only be used with WISSOTA spacer/restrictor from Speedway motors p/n 135-1955, Max spec spacer with gaskets may be 1 1/4”.

7/15/25 - Please refer to the WISSOTA 2025 Rule Book, page 94, Section D, which clearly states:
"Shocks must be one-piece steel body. No multi-piece bodies or bulb tops allowed."
If you are currently using a multi-piece body shock, you must switch to a one-piece steel body shock immediately to remain in compliance.
This rule is effective immediately 7/15/2025 and will be enforced at all WISSOTA-sanctioned events.

2025

4/25/25
Option HORNET Exhaust Update. Goes into effect 4/25/2025

All years and Models and Makes of Cars Must have Factory Stock Exhaust Manifold With 2-inch OD MAX. Exhaust Pipe with Muffler 12 to 18 inches away from Front of Gas tank with a 90 Degree turn down with an Exhaust Hanger Buy Muffler. Gas Tank under car Still has to have shield plate under it.

ST. CLOUD, MN (December 18, 2014) – A diagram which outlines the specifications for frame measurements in the Modified and Midwest Modified divisions is available. Shown are the legal dimensions for the 1968 to 1972 Chevelle stub/frame. If your frame does not meet these measurements, please consult your chassis builder.

Officials of WISSOTA, USRA, and USMTS have produced a video tutorial which will help drivers, chassis builders and tech officials properly measure race car frames to ensure they meet 2015 rules and beyond. The following video helps to explain how Modified and Midwest Modified frames will be measured to ensure they comply with WISSOTA rules. If you have any questions, please contact Bill Engelstad at (218) 262-5823 or (218) 208-7844 or email him at bill@wissota.org.

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 director shall be empowered to permit reasonable and appropriate deviation from any of the specifications herein or impose any further restrictions that in his/her opinion does 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.