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| Date | Sunday 15 March 1981 |
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| Start time | 14:00 |
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| Event | US West GP |
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| Circuit | Long Beach |
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| Event Format | Race of 80 laps |
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| Race | 2 of 16 |
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| Championship race | 343 |
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| Laps | 80 |
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| Circuit Perimeter | 3251 m |
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| Race Distance | 3251 × 80 + 1625 = 261.705 km |
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| Grid Format | 2-2-2-2 (staggered) |
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| Pole Position | Right |
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| First Corner | Right |
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| Track Direction | Clockwise |
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| Weather | Sunny, Hot, Dry |
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| Entries | 29 |
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| Qualifiers | 24 |
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| Finishers | 8 |
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| Championship Debutants | Chico Serra (Driver),
Eliseo Salazar (Driver),
Miguel Angel Guerra (Driver),
Siegfried Stohr (Driver),
Alfa Romeo 179C (Car Model),
Brabham BT49C (Car Model),
Ensign N180B (Car Model),
Ferrari 126CK (Car Model),
Fittipaldi F8C (Car Model),
Ligier JS17 (Car Model),
March 811 (Car Model),
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McLaren M29F (Car Model),
Renault RE20B (Car Model),
Theodore TY01 (Car Model),
Williams FW07C (Car Model),
Ensign Racing (Entrant),
Equipe Talbot Gitanes (Entrant),
March Grand Prix Team (Entrant),
Marlboro McLaren International (Entrant),
Ragno Arrows Beta Racing Team (Entrant),
Theodore Racing Team (Entrant),
Tyrrell Racing Team (Entrant)
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| Milestones | Car 29 - 1st Pole Position (Car Number)
Arrows - 1st Pole Position (Car Manufacturer)
Bruno Giacomelli - 25th Race Entry (Driver)
Mobil - 10th Fastest Lap (Lubricant Manufacturer)
Ragno Arrows Beta Racing Team - 1st Pole Position (Entrant)
Riccardo Patrese - 1st Pole Position (Driver)
Valvoline - 20th Pole Position (Lubricant Manufacturer)
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| Records Broken |
1. Most 21st Place Qualifications –  Jan Lammers (8)
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| Records Extended |
1. Most Retirements – Lotus (389),
2. Most Race Entries – Lotus (894),
3. Most 5th Place Qualifications – Ferrari (83),
4. Most 13th Place Qualifications – Lotus (44)
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