Stock Classes:
900lb, 10hp or less
1000lb, 12hp or less(14-16hp run at 3200RPM)

Mod Stock/ Stock Altered:
800lb Mod Stock, 8hp or less No Billet Head
850lb Mod Stock, 8hp or less No Billet Head
950lb Stock Altered, 12hp or less
1050lb Stock Altered, 14hp or less

Pro Stock:
1000lb, 50.5 Cubic Inches
1050lb, 50.5 Cubic Inches

Limited Outlaw:
1500lb     See Class Rules
1600lb     See Class Rules