Tipo A6GCM - 1951 to 1953

Designed by engineers Bellentani and Massimino, the A6GCM was only partially based on the A6GCS: initially, for instance, it had the same bore and stroke measurements, but a twin overhead camshaft distribution. The chassis was inspired by the 4CLT/48's, but it immediately became clear that it was not entirely able to cope with such a powerful engine. This resulted in continual modifications being made to the car and even by the time it made its debut in the 1952 Italian Grand Prix, the chassis had been reinforced, bore and stroke became completely square, and twin-plug ignition had been adopted.

With the arrival of Gioachino Colombo in 1953, the design was given a complete overhaul. The engine power was upped to 190 bhp and the chassis was given a new tubular structure, which was very resistant to torsional stress. The single-seater thus became extremely effective indeed on the track and shattered Ferrari's dominance in several Grands Prix.