The Ferrari flat-12 engine family is a series of 180° V12 DOHC petrol engines produced by Ferrari from 1973 to 1996. Introduced with the 365 GT4/BB, this engine shared its construction with the flat-12 race-engines used in the 312B and 312 PB, but its displacement, bore & stroke, rods and pistons were the same as the Tipo 251 60° V12 Colombo engine powering the Daytona it replaced. Design and development of the new engine was overseen by Ferrari engineers Giuliano de Angelis and Angelo Bellei.