Class Structure
Vehicles were separated into various classes based on engine capacity. The ATCC used a two class system throughout the second Group C era with the field divided into Under 2000cc and Over 2000cc classes from 1973 to 1975 and then into Under 3000cc and Over 3000cc classes from 1976 to 1984. Favourable points structures were used to encourage the smaller cars but it would take until 1986, after the abandonment of Group C, for a small class car to take outright victory in the ATCC.
The Bathurst 1000, as it became in 1973, would change several times, reflecting its roots as a race where four or five individual races held simultaneously with no outright winner promoted. The 1973 version began with cut-offs at 1300cc, 2000cc and 3000cc. For the 1977 race the under 1300cc class was abandoned and a 1600cc class was introduced for the 1979 race. After a one off cylinder based system used in 1981, the two smaller classes were removed leaving just under and over 3000c. The capacity based system was abandoned entirely for the final Group C Bathurst race in 1984.
Read more about this topic: Group C (Australia)
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