Roger Penske bought a used 512 M chassis that was totally dismantled and rebuilt. The car was specially tuned for long races receiving many unique features, among them were a large rear wing and an aviation inspired quick refueling system. The engine was tuned by CanAm V8 specialist Traco, and was probably able to deliver more than 600 hp (450 kW). As of today it's unknown to what extent Penske's initiative was backed by Ferrari works. This 512M was painted in a blue and yellow livery and was sponsored by Sunoco and the Californian Ferrari dealer Kirk F. White. The car made the pole position for the 1971 24 Hours of Daytona and finished second despite an accident. For the 12 Hours of Sebring the "Sunoco" made the pole again but finished the race at the sixth position after making contact with Pedro Rodrigez's 917. Despite this misfortune the car had proved to be a serious opponent for the 917. Not only this car was the fastest on track in Daytona and Sebring but it was also the car that had the shortest refueling time.