Pre-1920 Exhibition Race
1966-1985 Masters Historic Formula One
1920-1951 Racing Cars
1947-1955 Sports Racing and GT
1955-1964 GT
1963-1966 GT over 2500cc
1973-1981 FIA, IMSA, GT, GTX, GTU, AAGT
FIA Manufacturers Championship
1981-1991 IMSA, GTO, GTP, Trans-Am
1955-1961 Sports Racing under/over 2000cc
1961-1966 GT under 2500cc
1966-1972 Trans-Am
1983-2016 Masters Endurance Legends
1963-1978 IndyCar
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