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.

2026 Car Decals

VERY IMPORTANT:
Graphic Designers — it is critical that all measurements provided in this download are followed exactly. While measurements may appear different depending on your design software, you MUST ensure that your final artwork strictly adheres to the measurements provided in the original file. Failure to follow the specified measurements may result in incorrect sizing or unusable artwork.

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.

4/14/26
CT525 Late Model engine combination in the higher elevations of over 2000 feet above sea level for our most western tracks may make an ignition timing change to a single and only 34 degrees and no longer follow a timing curve. The maximum RPM will remain at the current 7200 RPM. All elevations below 2000 feet will continue to follow the same timing curve and requirements as last year and as indicated in the rule book. WISSOTA will monitor the results of this change and determine if any other action is necessary.

4/30/26
We have aligned with the unified late model construction rules with the exception on the droop rule. For clarification, the rear deck height is maximum 39” inches measured from the ground to the top of the deck. Measurement is to be taken at the center of the rear deck after the race with a 1” inch maximum tolerance. Anything beyond that tolerance is deemed illegal.

4/30/26
The rule book has an incorrect dimension on the roof slope. The correct dimension is maximum slope of 5” inches (the same as it was in 2025) from front to back and level side to side.

4/30/26
Total body clearance of the lowest part must be a minimum of 4” inches including the nose from the ground.

Nose can be a maximum of (3”) difference in height from side to side from ground to the bottom of the nose. Measured from lowest consistent part of nose to highest consistent part of nose with driver in car. This includes the front fender flares from in front of the left front tire all the way around to in front of the right front tire.

The doors have a maximum materials height of 33” inches from top to bottom including aluminum and the plastic runner underneath. The dimension in the picture diagram was not updated with this new dimension that is correct on page 57.

2026

3/20/26 - After thorough research on last seasons after race weights the new tech committee feels an amendment to the 602-crate engine weight is warranted.
There will no longer be a weight break for the 9” inch rear-end as indicated in the rule book however there will be an amended overall weight for the 602-crate engine combination only.
602-crate 2550 lbs.
All other engine combinations 2625 lbs.

4/30/26
The rule book has an incorrect dimension on the roof slope. The correct dimension is maximum slope of 5” inches (the same as it was in 2025) from front to back and level side to side.

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 Rick Thoennes WISSOTA Tech Advisor, phone: 320-760-0112, email: techadvisor@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.