BRAKE & FRONT END, March 1971: In 1971, Formula 5000 in the U.S. was a direct rival to Europe’s Formula One. The Questor Grand Prix pitted the purpose-built 3.0L racing engines against 5.0L stock-block pushrod engines in very similar chassis. This non-championship race attracted 38 cars due the generous prize money. Due to the differences in fuel tank size, the race was split into two heats. The winner of the event was Mario Andretti in a Ferrari, the highest placing Formula 5000 car was Ron Grable in 7th place.