| Closed
cockpit purpose-built prototypes |
|
Working headlights
and brake lights |
| Chassis
design must have prior approval by Grand American |
|
Weight: 2,100
to 2,175 pounds, depending on engine size |
| Full-width
roll cage |
|
Spec wing |
| 18
x 14-inch maximum wheel diameter and width |
|
Six-speed sequential
gearbox |
| Steel
brakes |
|
Flat bottom |
| Normally-aspirated
(5.5 liter max) engines with restrictions to balance performance |
|
Chassis: Riley Technologies
Power Plant: Pontiac |
