USAC 1970
CLERMONT, IN - JULY 26: Mario Andretti (#1) in his STP McNamarra chases race winner Al Unser (#2) in his Johnny Lightning Colt Ford during the USAC INDY 150 Champ Car Race held on the road course at Indianapolis Raceway Park (IRP) on July 26, 1970 in Clermont, Indiana. (Photo by Alvis Upitis)