Late Model EFI Rules

Last Updated 7/6/18
Changes Marked in Yellow

Please also read the ORP General Rules which apply to all races conducted at Ozark.


  • LS, Coyote, or Late Model Hemi engine only. ANY Engine with EFI
  • Exhaust – Mufflers required on all combinations except turbos. Exhaust exiting ahead of
    front tires allowed, but must not affect timing or staging beams. No Zoomies.
  • Engine diaper or NHRA accepted belly pan for oil containment required.


  • N2O – Single Stage Maximum
  • Blower- 8-71 Maximum
  • ProCharger – F1X Maximum
  • Single Turbo – 88mm Maximum
  • Twin Turbo – 67mm Maximum


  1. No Back Half Chassis, No Full Tube Chassis.
  2. Cars must maintain the factory frame. Frame rails must be located in factory position.
  3. Chassis bracing and reinforcing is permitted.
  4. Ladder Bars permitted.
  5. Factory four links are acceptable. Aftermarket four links are illegal!
  6. Minor frame notching will be allowed.
  7. Bolt on front K member allowed.
  8. Front frame rails must be in original OEM location.
  9. Front suspension components may be replaced with after-market bolt-on parts.


  1. Fiberglass hoods, bumpers and deck lids will be the only fiberglass body parts allowed.
  2. Lexan windows are legal


  1. Drag Radial Tire labeled 275/60R15 or smaller.
  2. 28×10.5 Pro Bracket Radial.
  3. 10.5×28.5 slick or smaller – No W’s.


  1. 3000 lb. minimum weight for all combinations
  2. Engine Transplants OK
  3. Cars must have factory interior. Racing seats allowed. Rear seat may be removed.
  4. Cars must have WORKING headlights and tail lights.
  5. Cars must have coolant overflow tank and secured battery mounts mandatory.
  6. Rules subject to review at anytime. Competitors will have a 30 day compliance period should there be any new rules.
  7. No tow vehicles. Racers must drive to the staging lanes from their trailer and drive back to their trailer after their pass.
  8. Cars will run on a .400 pro tree, for an 1/8th mile.
  9. All cars must be able to pass track’s tech inspection – NO EXCEPTIONS.