Following the Pre-A prototypes and a run of quad-cams with the 1500cc engine, the 1600 Carrera GT was a performance 356 that used a larger version of the Porsche 550 Spyder's potent engine. As early as 1958, some Carreras were fitted with a larger engine known as the Type 692. The new unit featured a larger displacement which was better suited for the 1600cc class. Furthermore, it was improved considerably adopting plain bearings and new ignition system.