Ontario Motor Speedway, Ontario, California, United States
Circuit Type: Permanent road course
Road Course
Extension: 5,139 Km
Lap Record: 1:42.777
Year: 1971
Driver: Pedro Rodriguez
Car: BRM P160
Speed: 180,075 km/h
Pole Record: 1:41.257
Year: 1971
Driver: Jackie Stewart
Car: Tyrrell-Ford Cosworth 001
Speed: 182,778 km/h
| Year | Official Name | Date | Winning Driver | Constructor | Laps | Time | Formula |
|---|---|---|---|---|---|---|---|
| 1971 | Questor Grand Prix | March 28 |  Mario Andretti |
 Ferrari |
64 |
01:51:48.410 | F1EC |