For many fans, Giotto Bizzarrini remains an unknown person with a surname that is a bit... strange! And yet, he is the engineer who laid the foundations of the 250GTO at Ferrari. Officine whose door he took after the clash in 1961 between Enzo and his directors. With the support of other Ferrari executives, he founded ATS and imagined the 250 GT Breadvan, a Ferrari competing with the official Ferraris! In 1962, via his company Autostar, Lamborghini entrusted him with the design of its famous V12 engine. As early as 1963, he designed the Grifo A3L and A3C for the new ISO Rivolta brand. The following year, he resumed the marketing of A3Cs on his own account. These will be the Bizzarrini 5300 GT Strada and Corsa.