Late Models

1. Competing Models: Stock front clip chassis minimum wheelbase of 102” and fabricated front clip chassis minimum wheelbase of 103”.
2. Frames/Front Suspension:
a. Stock Front Clip Car: Main frame rails (from stock front snout to rear bumper) must be made from a minimum of 2” x 2” steel tubing. Stock front snout and suspension is required and may be reinforced.
b. Fabricated Front Clip Car: All frames must be comprised of minimum 2” square or 1 ¾” outside diameter round tubing with a minimum wall thickness of .083”. The maximum engine setback is 6”. Rack and pinion steering allowed.
3. Rear End Suspension:
a. Stock Front Clip Car and/or Fabricated Front Clip Car: No electronic traction control devices allowed. Any type quick change or floater rear is allowed.
4. Brakes: All cars must have operational four wheel braking system. Any aftermarket aluminum caliper and aftermarket steel rotor may be used on the front and rear of the car. Neal pedals or any conventional type adjustable brake system allowed. No electronics allowed.
5. Wheels: Any approved steel or aluminum racing wheel with a maximum 14” width is allowed. Bead locks allowed.
6. Tires: The American Racer MD-56 (Spec Tire), American Racer MD-48 (Spec Tire), American Racer 70 (Spec Tire), Hoosier D-55 (Spec Tire), Hoosier D-21 (Spec Tire), Hoosier Spec 1350, Hoosier Crate 21 Spec, Hoosier Crate 55 Spec, Hoosier 1600 Spec and Hoosier D70 Spec Tire are the only tires that are allowed.
a. Tire softeners or heaters are not permitted. Tires may be impounded by Oglethorpe Speedway Park officials and checked for tire softeners.
b. Tires may be checked for hardness before race or after cooling down if after race.
7. Bodies: (Diagrams in back of the book) Standard dirt type bodies allowed. May be made of steel, aluminum or fiberglass.
a. No wedge style bodies, roof mounted spoilers or wings.
b. Nose and roof must match body style.
c. Floor boards and firewall must cover the driver’s area and be constructed to provide maximum protection.
d. A minimum of three (3) front windshield driver safety bars required.
e. No fins or raised lips of any kind permitted anywhere.
f. Body line must be smooth, even line from front to rear of car.
g. Must have stock nose piece. No wedge noses. Must be mounted not to alter original shape. Stock nose piece can extend a maximum of 52” from center of front hub to farthest point extending forward.
h. Roof: Must be a minimum of 45” (maximum 48”) from the ground at any point and must be mounted parallel to the body and near center of the car. No lip on the rear of the roof. All roof side panels must extend to edge of the body and be flat. Dimensions; minimum 48” x 46” long, maximum 50” x 51” long.
i. Front fenders and hood must be level and flat from left to right side of the car. Fenders cannot gain height from front to rear of car. No part of fenders or hood can be below the outside body line. Tires may not protrude outside body lines more than 2”. A hole may be cut in the hood for breather.
j. At no point can door side break in towards the center of the car. Side exiting exhaust pipes must be flush with body (no sharp edges or tire poppers).
k. No offset quarter panels. Center of rear hub to end of quarter panel cannot exceed 48”. Measured in a horizontal line. No wheel skirts.
l. Interior may be dropped to the middle of the car no more than 4” below the top of the doors and must be at least 12” below roll cage.
m. Rear Deck height measured from ground 38” maximum.
n. Front fenders and center of door material maximum height 37”.
o. Body width measured at center of door 78”. Body at rear of car top 72”, middle 78”, center bottom 82”.
p. All body dimensions are found in the diagrams at the back of the book.
8. Spoiler: Rear spoiler material 12” maximum, measured from the deck to the tip of the material and can be a maximum of 72” wide. Three (3) spoiler supports may be used. Rear spoiler cannot be suspended above deck to create a wing effect. Spoiler must begin where quarter panel ends. No extended decks.
9. Fuel Cell: refer to Safety Section, rule #7.
10. The OSP Late Model GM Factory Sealed Crate Engine
a. The only sealed crate engines allowed to compete within the Late Model division will be the GM Performance 400 hp Late Model Engine (GM part number P/N 88958604) and the GM Performance 350-HO (GM part number P/N 88958602). The GM Sealed Crate Engine may be run with Chevrolet, Ford or Dodge bodies.
b. The engine seals must remain intact and not be tampered with prior to competition at OSP. Any seals that have been removed or tampered with prior to competition will make the engine illegal and not eligible for competition at OSP. The penalty for anyone tampering with the seals, modifying any internal engine parts, changing the parts from stock as delivered sealed from the factory will be subject to fines and expulsion from racing at OSP the remainder of the season and future seasons.
c. No changes are allowed to the engine manifold or other exterior components (polishing, machine work, etc.). All engine parts must remain stock as they came from the factory. Engines must remain stock as they were delivered from GM, no changes to the rocker arms, harmonic balancer, etc. Any modifications will result in the engine being declared illegal for usage at OSP.
d. Any 750 carburetor or smaller allowed. Must have 1 11/16th base plate maximum. A one-inch spacer is allowed on 604 and two-inch spacer is allowed on 602. A one-piece open hole paper gasket (maximum 0.065 inch thick) that matches the exterior dimensions of the carburetor throttle base plate must be installed between the carburetor and the intake manifold with no air leaks.
e. No tri-y headers.
f. Crate Engine Claim Rule
1) Oglethorpe Speedway Park or any driver finishing on the lead lap of the feature race may claim another driver’s crate engine (GM P/N88958602 or GM P/N88958604) for the current retail price including tax, plus an additional $250.
2) Refusal to accept the claim will result in immediate disqualification of the claimee for the event.
3) A driver must have competed at the track the previous three race events to be eligible to claim another driver’s engine.
4) The chief steward has the right to refuse any claim. OSP will not allow the claim rule to be abused.
11. OSP Late Model GM Factory Sealed or Authorized GM Sealed Engine
a. All GM Factory sealed or Authorized GM Sealed 602 and 604 crate engines must meet the original blueprint specifications using original or replacement GM parts as described in the GM Performance Parts Crate Engine Technical Manual – part number 889958668.
b. OSP at its discretion will use all necessary means to determine the legality of a GM Factory Sealed or Authorized GM Sealed crate engine.
c. All crate engines must have GM Factory seals or GM Authorized seals to compete.
12. Radiators must be mounted in front of the engine. Electric fans are allowed.
13. Clutch is mandatory. All cars must start under their own power. Transmissions with internal clutches allowed and must have working reverse. Bert or Brinn transmissions allowed. Automatic transmissions allowed (safety jackets highly recommended).
14. Any driveshaft is allowed. All drive shafts must be painted white and have the car number painted on it in contrasting colors.
15. Weights:
a. All weights will be made on Oglethorpe Speedway Park scales and will be with the driver. Weight must be displayed on the right front fender.
b. Any car/chassis participating with the Late Model GM Factory Sealed or GM Authorized Sealed Crate Engine P/N 88958602 must weigh a minimum of 2,200 pounds.
c. Any car/chassis participating with the Late Model GM Factory Sealed or GM Authorized Sealed Crate Engine P/N 88958604 must weigh a minimum of 2,300 pounds.
d. 1 pound per lap burn off after the race is allowed.
16. Engine vacuum evacuation systems of any kind are not allowed.
17. No porta-power weight jacking devices allowed.
18. Cubic inch of engine must be painted/decaled on both sides of the hood.
19. The absence of a specific rule does not imply approval, consent or permission regarding that subject. Any questions or doubts regarding such matters should be directed to speedway officials for a clarification.
20. Any further definitions or interpretations of the rules will be made by the Oglethorpe Speedway Park officials only.
21. All Late Model drivers must use a “RaceCeiver”. This will allow the control tower officials to communicate with each driver. The “RaceCeiver” will be available for purchase from OSP.
22. Safety regulations are listed under “Safety” at the front of this book.






Late Model