In 1966 the Formula 1 regulations changed, passing to 3000cc of maximum displacement for naturally aspirated engines and 1500cc for supercharged ones, with a minimum weight of 500 kg. Ferrari developed a car, the 312, destined for a long evolution over the years. The engine was a 2989cc V12 that developed 360hp. The chassis was a monocoque, similar to that of the 158 and 512 F1. However, the 1966 season proved to be rather complicated and Ferrari had to settle for only two victories, in Belgium with John Surtees and in Italy with Ludovico Scarfiotti. During the year Surtees left the team due to a controversy with sporting director Eugenio Dragoni. The season was dominated by the Jack Brabham (Brabham-Repco).