Groups 6, 10 & 12a

Group 6 – Select big bore production sports cars and sedans through 1972

Group 10 - Select GT sports cars, Trans-Am; select cars raced between 1973 and 1999, Trans Am and production based contemporary cars as raced from 1999 to 5 years from today’s date or other cars as assigned

Group 12a - Post 1972 prepared cars, a combination of large and small bore cars