After a year of apprenticeship, by 1970 the Porsche 917 was finally a reliable and balanced car. After losing the first race at Sebring, won by the Ferrari 512S, the 917 proved to be almost unbeatable. The 1970 car had an updated bodywork, which had been developed as early as the end of 1969. The engine, type 912/00, was the 4.5 liter, which was later replaced by the 4.9 liter 912/10. The 917, in short configuration (917K) was also the car with which Porsche took its first victory at Le Mans. A particular aerodynamic long tail body was also studied for Le Mans, which was then re-proposed, with some modifications, also in 1971