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Pan to Indy race cars on pace lap at Indianapolis Motor Speedway / old man waving red flag as race cars pass / Indy race cars slowing down, passing grandstands / race car driver BOBBY UNSER seated behind wheel of Eagle Offenhauser #8 while pit crew fuel car / Lee Kunzman racing Eagle Offenhauser #16, Mario Andretti racing Viceroy sponsored Parnelli Offenhauser #11, Mark Donohue racing Eagle Offenhauser #66 /Mario Andretti driving Parnelli Offenhauser #11 into pits / Joe Leonard driving Samsonite sponsored Parnelli Offenhauser #1 into pits / crew pushing Bobby Allison and Sunoco sponsored McLaren Offenhauser #12 through pits, judge holding yellow caution flag in BG / Jerry Grant behind wheel of Dan Gurney Racing Olsonite Eagle Offenhauser #48, being refueled during pit stop / Jerry Grant driving back into race / Al Unser Sr driving Parnelli Offenhauser #4 through pits / Rear view crew pushing off Indy race car / AJ Foyt or George Snider driving Coyote Foyt #84 through pits. 1973 Indianapolis 500 on May 30, 1973 in Indianapolis, Indiana (Footage by Getty Images)