HMSA Classes
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Class A
A-1, 1900-1926 Sports & Racing Cars
A-2, 1927-1939 Sports Cars
A-3, 1929-1939 Racing Cars
A-4, 1946-1954 Grand Prix Cars -
Class B
B-1, 1947-1955 Sports Cars (GT)
B-2, 1947-1955 Sports Racing Cars Under 1500cc
B-3, 1947-1955 Sports Racing Cars Over 1500cc -
Class C
C-1, 1955-1960 Sports Racing Cars Under 2000cc
C-2, 1955-1959 Sports Racing Cars Over 2000cc -
Class D
1959-1965 Sports Racing Cars
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Class E
E-1, 1958 – 1959 Formula JR. (Front Engined Fiat, Lancia)
E-2, 1959 – 1960 Formula JR. (Drum Brake cars)
E-3, 1961 – 1963 Formula JR. (Disc Brake Cars)
E-4, 1949 – 1963 Formula I – II
E-5, 1967 – 1980 Formula Atlantic -
Class F
F-F 1967 – 1972 Formula Ford
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Class G
G-1, 1955-1961 GT Cars Under 2000cc
G-2, 1956-1962 GT Cars Over2000cc
G-3, 1962-1965 GT Cars Under 2000cc
G-4, 1963-1965 GT Cars Over 2000cc
G-5 ,1967 – 1972 A Sedan -
Class H
H-1 1964 – 1969 FIA Makes Championship Cars
H-2 1970 – 1983 FIA Makes Championship Cars -
Class I
I-1, 1973 – 1980 IMSA GT Cars
I-2, 1981 – 1989 IMSA GTP Cars
I-3, 1980 – 1991 IMSA GTO and SCCA TRANS-AM -
Class J
J-1, 1966 – 1968 CAN-AM
J-2, 1969 – 1974 CAN-AM -
Class K
1967 – 1978 Formula One
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Class L
1966 – 1972 SCCA TRANS-AM
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Class M
1968 – 1976 Formula 5000
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Class N
THRU – 1997 NASCAR Grand National and Winston Cup