In the early 1950s Maserati had achieved racing success and international visibility, thanks to cars such as the A6GCM; its 2-litre, twin cam inline-six engine had already been enlarged to three litre capacity on the Maserati 300S. Chief engineer Giulio Alfieri felt the next step was to design an all-new 3.5-litre engine; the resulting long-stroke six, designed foremost for endurance racing on the Maserati 350S, was ready in 1955.[1] In the meantime Maserati's first forays into the grand tourer market, the 1947 A6 1500, 1951 A6G 2000 and 1954 A6G/54, had proven that the business was feasible; but the A6 road cars were still built in just a dozen examples a year—hardly series production. A different approach was needed to build fully accomplished grand tourers.