Riverside: Mark Donohue, Roger Penske Ent. Inc., Porsche 917/30 TC leads Brian Redman, Vasek Polak Racing, Porsche 917/10 TC and David Hobbs, Roy Woods Racing, McLaren M20 Chevrolet.
Mark Donohue, Roger Penske Ent. Inc., Porsche 917/30 TC leads Brian Redman, Vasek Polak Racing, Porsche 917/10 TC and David Hobbs, Roy Woods Racing, McLaren M20 Chevrolet.