Joe Leonard wins USAC Championship Car Series 1972
1961 USAC Sprints at IRP (First race at IRP)
Car and motorcycle show includes tricks, jumps, and demolition at Soldier Field i...HD Stock Footage
The 1974 USAC Championship Car season consisted of 14 races, beginning in Ontario, California on March 3 and concluding in Avondale, Arizona on November 2. The USAC National Champion was Bobby Unser and the Indianapolis 500 winner was Johnny Rutherford. Due to the events of the 1973 Indianapolis 500 significant improvements were made to the cars for safety concerns. Wings were reduced in size, and pop-off valves were added to the turbocharger plenums in order to reduce horsepower and curtail speeds.
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