Timeline
- 1964–1968 : 1100 cc maximum capacity (production-based) & 1000 cc (free design)
- 1969–1970 : 1600 cc maximum capacity
- 1971–1977 : 1600 cc maximum capacity, two valves per cylinder
- 1978–1988 : 1600 cc maximum capacity, production-based, single camshaft
- 1989-2002 : 1600 cc maximum capacity, production-based, single camshaft & 2000 cc (FIA Formula Three engines)
- 2003–date : 1600 cc maximum capacity, production-based, single camshaft
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