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| Date | Sunday 28 March 1971 |
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| Event |  Questor GP |
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| Circuit | Ontario Speedway |
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| Event Format | Two heats each of 32 laps; timings aggregated |
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| Championship | Non-championship |
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| Race number | #3 of 8 in 1971
#395 (of all time) |
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| Laps | 64 |
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| Circuit Perimeter | 5141 m |
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| Race Distance | 5141 × 64 − 18 = 329.006 km |
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| Grid Format | 2-2-2-2 |
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| Pole Position | Right |
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| First Corner | Unknown |
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| Entries | 30 |
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| Qualifiers | 0 |
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| Finishers | 30 |
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| Debutants | Al Unser (Driver),
George Follmer (Driver),
John Cannon (Driver),
Lou Sell (Driver),
Mark Donohue (Driver),
Ron Grable (Driver),
Sam Posey (Driver),
Swede Savage (Driver),
Tony Adamowicz (Driver),
ASD (Car Manufacturer),
Boss (Engine Manufacturer),
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Plymouth (Engine Manufacturer),
ASD American (Car Model),
BRM P155 (Car Model),
Brabham BT42 (Car Model),
Eagle (Car Model),
Lola T192 (Car Model),
Lotus 70 (Car Model),
Surtees TS8 (Car Model),
Questor GP (Event),
Ontario Speedway (Circuit)
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| Milestones | Car 12 – 1st Fastest Lap (Car Number)
Car 5 – 1st Win (Car Number)
BRM – 1st Fastest Lap (Engine Manufacturer)
Ferrari – 1st Win (Engine Manufacturer)
 BRM – 1st Fastest Lap (Car Manufacturer)
 Ferrari – 1st Win (Car Manufacturer)
 Pedro Rodriguez – 1st Fastest Lap (Driver)
 Mario Andretti – 1st Win (Driver)
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