Later versions, such as the 'M1B' and 'M1C', competed and raced in the North American Can-Am series, starting in 1966 season.

[9][10][11] The car was raced in North America and Europe in 1963 and 1964 in various Group 7 and United States Road Racing Championship series events.

[13][14] It was constructed out of a tubular space frame chassis, and, combined with its light weight of 551 kg (1,215 lb) this gave it a great power-to-weight ratio.

[15] The 4.5 L (270 cu in) Oldsmobile V8 engine developed around 310 hp (230 kW),[16] while the 350 cu in (5.7 L) Chevrolet small-block V8 engine was capable of developing over 550 hp (410 kW), and 538 lb⋅ft (729 N⋅m) of torque.

[17][18] This drove the rear wheels through a Hewland L.G.500 four-speed manual transmission.