Firestone Indy 400 - USAC Indy Car Years

USAC Indy Car Years

In 1968, American open wheel racing debuted at the circuit with a 200-mile (320 km) USAC Champ Car event. In 1970, USAC returned with what would become a traditional July race date. In 1973, a second USAC race was added to the Champ Car schedule, a fall race usually held in September.

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