The Porsche 917 is a sports prototype race car developed by German manufacturer Porsche. Constructed of advanced lightweight materials and powered by an air cooled 4900cc flat twelve that generated nearly 600hp. The 917K was an evolution of the original 1969 car. After the first 917s were run in 1969, it was clear the car's aerodynamics made it nearly undriveable at higher speeds, the JW and Porsche engineers came up with the idea of a more upswept tail The debut of the newly designed 917K was at the 1970 24 hour at Daytona, which this car won. The 917K also had wins at the 24 Hours of Le Mans in 1970 and 1971.