AL Unser at Michigan
BROOKLYN, MI - JULY 4: Velco (Vel) Miletich, car owner, George Bignotti, chief mechanic, and driver Al Unser, Sr. in the pits before the USAC Champ Car race as part of the unusual Twin Bill for stock and open wheel racers on July 4, 1970 at Michigan International Raceway in Brooklyn, Michigan. (Photo by Alvis Upitis)