Yamaha OX77 engine

The Yamaha OX77 is a naturally aspirated gasoline-powered 3.0 L V8 racing engine, developed and built by Yamaha for Formula 3000, specifically the Japanese Formula 3000 Championship, between 1987 and 1988. It is derived from the Cosworth DFV engine, but uses 5 valves per cylinder instead of the DFV's 4.

This engine notably won the 1988 Japanese Formula 3000 Championship, being driven by Aguri Suzuki.