The winner of Daytonaโs 1973 Rolex 24 was this Brumos Porsche 911 RSR driven by Peter Gregg and Hurley Haywood. Photo: Martin SpetzNissan GTP evoked a landmark era for North American prototype racing. Photo: Martin SpetzAโLancia Beta Montecarlo and a Group 44 Triumph TR8 prepare to head out for a lapping session. Photo: Martin SpetzA pair of Chevrolet Intrepids bracket a Nissan GTP-ZXโTurbo on the banking. Photo: Martin Spetz