1971 Questor Grand Prix. Photo Paul G. Whitworth1971 Number 25 John Cannon driving a F1 March Cosworth Ford V8 at Ontario Motor Speedway in the Questor Grand Prix. I took this photo on March 27, 1971. Photo and info Phil Brosius1971 Number 25 John Cannon driving a F1 March Cosworth Ford V8 at Ontario Motor Speedway in the Questor Grand Prix. I took this photo on March 27, 1971. Photo and info Phil Brosius1971 GP Questor USA. Copyright Michael Paden Hewit1971 F2 – XXVI B.A.R.C. “200” Thruxton. Photo Tim Marshall1971 Questor Grand Prix. Photo David Harding via FB1971 USA GP with Jo Siffert. Photo Norm MacLeod via Flickr1971 USA GP. Photo Robert R. Perron1971 USA GP
