Watkins Glen 6 Hours: Derek Bell / Richard Attwood, J.W. Automotive Engineering, Porsche 917 K leads Jo Siffert / Gijs van Lennep, J.W. Automotive Engineering, Porsche 917 K.
Derek Bell / Richard Attwood, J.W. Automotive Engineering, Porsche 917 K leads Jo Siffert / Gijs van Lennep, J.W. Automotive Engineering, Porsche 917 K.