The M6 was built as a respose bigger "5 litre sportcars" such as the Porsche 917 and Ferrari 512 were banned at the end of 1971 season.

This leaf the scene open to nimbler "3 litre prototypes" and JWAE was ready with its new project from Len Bailey.

The M6 is of monocoque design made from aluminium alloy bonded and riveted to steel bulkheads. Suspension is a double adjustable independent coil over shock design with Koni dampers. Adjustable tubular anti-roll bars are fitted front and rear. Lockheed 4-pot alloy calipers with vented rotors are employed. The gearbox is a Hewland 5-speed DG 300, although a ZF was used at LeMans. Wheels were of JWA design.

The M6 first appeared at Sebring, the third event of the 1972 season, with the dependable Cosworth DFV engine. This V8 power plant (DOHC 2993cc) of cast aluminum alloy produced 445 horsepower at 10,500 rpms. Lucas CD ignition and fuel injection were part of the package. Total vehicle weight was 1,624 pounds (750 kilos).

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