Group 1 Vintage & Historic Under 1.5 liter
1a Thru 62 under 1.5 liter
1b Historic (63-72) under 1.5 liter
Group 2 FV Formula Vee
Group 3 Vintage & Historic over 1.5 liter
3a Thru 62 1.5 - 3.0 liter
3b Thru 62 3.0 - 5.0 liter
3c Historic (63-72) 1.5 - 3.0 liter
3d Historic (63-72) 3.0 - 5.0 liter
3e Vintage (thru 62) over 5.0 liter
Group 4 Monoposto
FJ1 Front engine jrs.
FJ2 Early rear engine jrs.
FJ3 Late rear engine jrs.
FF Formula Ford
Group 5 Historic/Special Historic/Trans Am
5a Trans Am sedans under 2.5 liter
5b Trans Am sedans 5 liter & A sedans
5c A & B production Sports Racing/Can Am
Group 6 Sports Racing/Can Am
6a Under 1.5 liter
6b 1.5 - 3.0 liter
6c Can Am
6d FIA Makes cars
6e Formula 1 & 5000
Group 7 Group 70 + includes 73-87 production
based and purpose built race cars
that were designed to race in a series
such as IMSA, TransAm, SCCA and
CASC GT classes among others;
upon approval.
Group 8 WHRRI Challenge T1, T2, ITE, AS
Corvette, Mustang & Camaro 1980-2012
upon approval.
Group 9 Trans Am B Sedan 2.5 Challenge Race