Junior Late Models

Irwindale Speedway

Junior Late Model Division Rules


Driver eligibility;

1- Drivers must have prior racing experience and each driver must present a racing resume for approval. E-mail joey@irwindalespeedway.com to request a driver application

2- Drivers must be no younger than 10 and no older than 16 years of age. Drivers that turn 16 during the season and have already begun the championship are eligible to continue for the remainder of that season. (Note, there is an exception process we have set up for drivers older than 16 that lack the proper experience to compete in the LKQ Late Model Division. Pease contact the Speedway for more information about this process).

3- The parent or legal guardian of a driver must sign the minor’s release.


Junior Late Model Series Rules


Chassis and Body

  1. Any late model type chassis allowed / Body type is open. There is a 48″ maximum front overhang measured from the axle measured to the forward most part of the car, ABC nose piece firmly recommended (note, any car that does not run an ABC style nose will be on a zero contact policy). There is a 55″ maximum rear overhang measured from the rear axle to the rearward most part of the race car body/bumper/spoiler (nothing may extend beyond 55″). Note; If rear bumper rail is exposed, it must be rounded where it meets the quarter panels so that it has no square edges and it must turn back in behind the rear tires and connect to back to the frame. The bumper must extend to the rear of the car even with the spoiler or extend beyond the spoiler of the car. Maximum rear quarter panel height is 36 “. Maximum rear width of the body at bumper height is 72”. The window opening on the driver’s side must be a minimum of 13″ at the center of the door to the roof. Minimum wheel base is 101”. Ride height rule; all cars must be able to get on and off the inspection scales without the use of any extra ramps or boards and the car must not drag on the scales.

Rear Spoiler size is to be 60″ x 6 1/2″ tall and no less than 70 degrees. There may be NO forward support of any kind, no boxed ends or runners. No Gurney lip or any type of wicker bill on the upper edge of the spoiler. It is highly recommended that the Upper 2/3’s of the spoiler and the rear window of the car be made of CLEAR lexan to enable other drivers to see through them.



  1. Weight; GM 602 cars must weigh 2875lbs total weight with maximum 60% left side weight. All other cars are to be 3075lbs with maximum 58% left side weight. 602 engines must remain OEM as they came from the factory. All cars must run a 6,000 RPM chip; this includes GM 602, and the open engines.

Any cast iron block wet sump engine allowed.

The engine set-back rule is 2″ back (the center of the forward most spark plug hole to the center of the upper ball joint on the same side) on the all non-602 crate engines. Maximum engine set-back for the GM 602 crate engine is 6″ measured the same way.

Restrictors / You may run any four barrel or a 4412 500cfm two barrel carburetor. All cars must run a Keyser ½” governor plate part number 100 12600 with the 1.000 inserts/restrictors in them. The part # for the inserts is 100 126100.

The cost of the Keyser Governor plate is roughly $67.00, and the cost of a set of restrictors is $30.00. They can be purchased from Keyser Manufacturing (Port City) at 800-472-2464 or from Summit Racing at 800-230-3030.

Note, if you run a four barrel carburetor the only spacer allowed is the ½” Keyser plate. If you run a two barrel you are allowed a basic two barrel to four barrel adapter above the ½” Keyser plate. If you run a two barrel carburetor with a 2 barrel intake you are allowed to build your own restrictor plate with two 1.000 holes in the plate, and with a max material thickness of 1/2″ plus a spacer above the restrictor.


Tires and Wheels

  1. Tires are the Hoosier 8.0-15/970 treaded tire. Tires MUST be purchased from the track, and tires MAY NOT be cut, soaked or altered in any way. Any team wishing to run used tires must submit the tires for inspection and scanning prior to qualifying, note these used tires must have been purchased from Irwindale Speedway as well at a past event. Tires:  Cars must start and finish the Main Event with the same tires they qualified with. Any tire changes after Qualifying must be approved. Driver will start at the rear field and tires will be subject to impound. Competitors must start on the tires they qualified with.


  1. Wheels must be steel 15’ diameter with a maximum of 8″ in width.


Suspension and Shocks

  1. Any steel shock, all external parts must be steel (Aluminum rod end on the shaft end ok, and an aluminum thread in body cap on the shaft end is ok)


  1. No traction control devices.


  1. All competing cars will not exceed 79″ inch track width; it will be measured from the bulge outside to outside of the front tires at the spindle height. No independent rear suspension.



  1. All cars must run the track spec fuel, the track spec fuel is Sunoco 110 Standard race fuel or Sunoco E-85R race fuel. Teams may also run stock Chevron 91 octane pump fuel with NO additives and NO mixing of fuels. These are the only fuels that are legal, no exceptions.


Drive Shafts

  1. No carbon fiber drive shafts allowed.


Note, the following infractions will result in a firm penalty which could include a LIFETIME ban from the Division or Irwindale Speedway:

  1. Being caught with traction control.
  2. Bypassing the RPM limiting control device in any way.
  3. Altering the GM 602 crate engine under the seals in any way that is non OEM. (you may run aftermarket valve springs but they must be the same spring pressures as OEM, you may run any carburetor, you may run an aftermarket OEM replacement distributer, you must run a mechanical fuel pump in the stock location, and you must run the stock oil pan and stock harmonic balancer).
  4. Altering the Hoosier 970 tire, such as soaking the tire, or cutting the tire. Tires be a stock 970 tire.
  5. If you are caught cheating the fuel in any way, the Sunoco fuel must be stock, and must not have ANY additives whatsoever.


Illegal components may be confiscated by Irwindale Speedway and become property of the speedway.