Grand National Class Rules- 1-5/16" wide

Grand Nationals are based on Nascar from the 60's through 80's. That Richard Petty style racing is always good fun. Get those big block Chevys, Fords, and Mopars ready cause its time to go racing. 

Chassis Specifications
Maximum tech width= 1.3125" (1-5/16")

Only Aurora or Model Motoring copper T-jet chassis
Chassis must remain stock without modifications

No venting, lightening or trimming allowed

Chassis gear plate rails maybe trimmed except under clip

No weight maybe added to chassis

No metal bearings allowed

Guide Pin maybe glued

Armature 

Any Aurora 

Minimum ohm of 5.0 

Armature can be balanced and trued

No rewinds or de-winds

Electrical System
Pick up shoes - open (maybe restricted)

Skis are not allowed

Pick up springs - open
Brushes - open (maybe scored)

Magnets

Dash killer Bee, OS3 Black Dragon or less strength magnets.

Dash Level 6 Magnets not allowed.
 

Gears 

Stock or stock replacement gears only which include arm pinion, idler, drive, and crown. This means any on-market gears, such as RT-HO, Dash gears, Model Motoring, etc. No lightened gears allowed. Minimum crown gear diameter shall be .300. All gears shall not be beveled or otherwise altered (chamfered, lightened, or relieved).

Pinion gear

Any pinion may be used.

Axles
Any axle allowed
Shimming is allowed

Tires
Wheels - any that support wide slip on tires

Brass or Plastic wheels are allowed

Front tire - width 3/16 inch minimum
Rear tires - open and slip on variety
 

Bodies

USAC/ARCA/NASCAR Late model type that ran from 1960-1980, replicas suggested.

Hard shell, resin, wide bodies permitted
Cars shall have front windshield
Rear windshield is optional
Body must have 3 numbers

Two Screws are Required