After dominating the 1970 season, the Porsche 917 underwent various updates. A new 5-liter engine (86.8x70.4mm) was introduced with a power that rose to 620hp. The aerodynamics were very careful, with a new bodywork characterized by large rear fins. The long-tail version, designed for Le Mans, also received a new aerodynamic configuration. The coupé version of the 917 confirmed its supremacy also in 1971, with the second victory at Le Mans for Porsche. The two leading teams were Martini Racing and Team Gulf Wyer. At the end of the season, with the change in regulations, the 917 was excluded from the World Championship, but the Spyder versions continued to be used in other championships, such as Can-Am and Interserie.