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| Date | Sunday 3 May 1981 |
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| Start time | 14:00 |
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| Event |  San Marino GP |
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| Circuit |  Imola |
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| Event Format | Race of 60 laps |
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| Championship | World Championship |
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| Race number | #4 of 15 in 1981
#346 (of all time) |
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| Laps | 60 |
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| Circuit Perimeter | 5040 m |
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| Race Distance | 5040 × 60 = 302.400 km |
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| Grid Format | 2-2-2-2 (staggered) |
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| Pole Position | Left |
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| First Corner | Left |
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| Track Direction | Anti-clockwise |
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| Weather | Overcast, Rain |
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| Entries | 30 |
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| Qualifiers | 24 |
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| Finishers | 13 |
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| Debutants |
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| Milestones | Parmalat Racing Team – 100th Race Entry (Entrant)
Valvoline – 200th Race Entry (Lubricant Manufacturer)
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| Records Broken |
1. Most Failures to Qualify –  March (47)
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| Records Extended |
1. Most Drivers' Championship Points Scores – Ferrari (412),
2. Most Constructors' Championship Points Scores – Ferrari (280),
3. Most 3rd Place Finishes –  Carlos Reutemann (19),
4. Most 5th Place Finishes – Ferrari (45),
5. Most Consecutive Drivers' Championship Points Scores – Carlos Reutemann (14),
6. Most Consecutive Constructors' Championship Points Scores – Carlos Reutemann (14),
7. Most Fastest Laps – Ferrari (92),
8. Most Races Led – Ferrari (197),
9. Most Laps Led – Ferrari (5609),
10. Most Poles – Ferrari (90),
11. Most 6th Place Qualifications – Ferrari (67),
12. Most 23rd Place Qualifications – March (20)
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