Show-Me Dirt

2026 Ozark Limited Late Model Series rules and regulations.

.1 body

Bodies on all cars must match national unified late model body rules.
All cars may run a 8″ spoiler.
604, .030 602 must have spoiler mounted at 90 degrees.

.2 Engines

There will be 4 packages allowed in the series in 2026.

Package 1. 602 crate.
602 unaltered crate motors allowed. GM bottle cap, IMCA, USRA, CRUSA, WISSOTA, UMP or POWRi cable seals are legal. Any damage to seals that is deemed intentional by tech official will be Disqualified and motor must be re-sealed before returning to another race. 6400 rpm limit. May run a max 750 4 barrel carb. Race gas and e85 allowed. Must pull 16 inches of vacuum at 1000 RPM.

Package 2. 604 crate
604 unaltered crate motors allowed. GM bottle cap, IMCA, USRA, CRUSA, WISSOTA, UMP or POWRi cable seals are legal. Any damage to seals that is deemed intentional by tech official will be Disqualified and motor must be re-sealed before returning to another race. 6200 rpm limit. May run a max 500 cfm Holley style 2 barrel carb. XP HP carb allowed no aerosol carbs. race gas and e85 allowed.

Package 3. Spec engine
Must follow all POWRi pure stock/mwm standard Engine rules. 6400 rpm limit. May run a max 750 4 barrel carb. Race gas and e85 allowed. Must have vacuum port in carb or intake. Must pull 15 inches of vacuum at 1000 RPM.

Package 4. .030 602 crate.
The POWRI or OLLMS sealed .030 over crate will be allowed to run. 6200 rpm limit. Must run a max 650 4 barrel carb. Race gas and e85 allowed. Must pull 16 inches of vacuum at 1000 RPM.

Must have type of engine on A pillar

May run a HEI or MSD style distributor. No circuit board or Davis technologies style modules.

Rev boxes must be wired per factory instructions.
Cars equipped with Ford engines may lengthen the harness to reach front mounted distributor.

.3 Electrical.
May only have one 12v battery in car.
May only have a 2nd battery if running a DeWalt battery style helmet blower.
No traction control of any kind if caught it’s a indefinite suspension from all OLLMS events.
May run alternator. Must be wired direct to battery.
No memory logging devices other than recall tach.
Digital tach allowed. Must be wired to ignition switch.
GoPro style cameras allowed on suspension components.
MSD digital soft touch or digital 6al boxes allowed must be wired per factory instructions.
Cars must start under their own power.

.4 Shocks/springs

Must run a twin tube non-adjustable shock. No canister/piggyback shocks allowed. No Air shock. 1 shock per corner. no internal or external bump stop allowed. Shock shaft must collapse completely into shock body upon request. Open spring rule. No spring packer/rubber allowed. Afco 14 series shocks are allowed.

.5 Tires

RF RR LR
American racer
Md56 cash stamped
Pro 3
Pro 4

LF open
————–
For the inaugural season due to old stock that is unable to be used due to current national series rules. The Hoosier D55 WRS-2 and D55 M40 tires will be allowed. Hoosier tires on RF RR and LR will be marked after hot laps and may not be changed unless damaged until conclusion of event.

Any tire that punches 50 or lower on tech official durometer after a heat or feature will result in a DQ.
Open LF tire.
May groove, grind and sipe.

.6 Droop rule.

All cars will be jacked up by frame with driver in seat til limiter chain is tight and tire leaves ground enough for a shim to slide under LR tire. Must be 50 inches from ground to deck with one inch tolerance. 51 1/16 of an inch is immediate DQ.

.7 Weight.

602, spec engine cars.
2250

604, .030 602 crate.
2350.

May add weight. Must be painted white or florescent orange with car number. No added weight to rear end housing. No lead shot. Tungsten or lead blocks only.

.8 Brakes.
May have RF shut off.
Must engage brakes on first pump of pedal.
Front to back adjustment only.

.9 Transmission.
Must have one forward and one reverse gear operational at all times.

.10 Claims.
Shocks may be claimed for $300 per shock or whole set for $1000 or $150 per shock exchange or $500 for whole set with exchange. 5th arm shock not included in claims.
Carbs may be claimed for $750 outright.
Drivers who start the A main may claim any of the drivers who made tech that night. You must be a member to make a claim. you are allowed 2 claims a year. Refusal of claim is loss of points and money for the night.

.11 format
All races will be old school open draw heads up in the heat races no re-draw for feature. Goal is to start 20 cars in the feature. All drivers who buy a membership get 1 emergency provisional for the year. 1 points provisional will be awarded to the highest points driver who didn’t qualify into the a main. Must complete all laps of b main to be eligible for points provisional.

.12 Membership.
Membership is $100 per racer.
Must be member to be eligible for points, contingency awards, emergency provisional, points provisionals. And claim privilege.

Series officials have all final say over on track, tech, and pit side conduct. Tech officials tools are the tools that will be used to determine legality of car. What the car weighed at home, what your tape measure reads, what your vacuum gauge reads, what your durometer punches, does not matter. Tech has final call. If needed clarifications will be made through the year.

$25 entry fee for all races

Source