Penske & Porsche Images
The green flag drops to signal the start of the race. Jackie Stewart, Carl Haas Racing, Lola T260 Chevrolet, battles with Pete Revson, McLaren M8F Chevrolet, at the start. They lead David Hobbs, A. G. Dean Racing, McLaren M8D Chevrolet, Denny Hulme, McLaren M8F Chevrolet, Mario Andretti, Ferrari 712 M, Mark Donohue, Penske Racing, Ferrari 512 M, and Jo Siffert, STP Racing, Porsche 917/10.