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| Date | Sunday 27 March 1949 |
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| Event |  Rio GP |
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| Circuit | Gávea |
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| Event Format | Race of 15 laps |
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| Championship | Non-championship |
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| Race number | #1 of 24 in 1949
#84 (of all time) |
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| Laps | 15 |
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| Circuit Perimeter | 10780 m |
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| Race Distance | 10780 × 15 − 60 = 161.640 km |
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| Entries | 10 |
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| Qualifiers | No qualifying session |
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| Finishers | 6 |
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| Debutants | Annuar de Góes Daquer (Driver),
Benedicto Lopes (Driver),
Chico Landi (Driver),
Domingos Lopes (Driver),
Francisco Marques (Driver),
Henrique Casini (Driver),
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Luigi Villoresi (Driver),
Nino Farina (Driver),
Alfa Romeo 8C-2300 (Car Model),
Bugatti (Car Model),
Ferrari 125C (Car Model),
Maserati 4CLT (Car Model)
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| Milestones | Maserati – 1st Fastest Lap (Engine Manufacturer)
Maserati – 1st Win (Engine Manufacturer)
Chico Landi – 1st Fastest Lap (Driver)
 Luigi Villoresi – 1st Win (Driver)
Maserati – 1st Fastest Lap (Car Manufacturer)
Maserati – 1st Win (Car Manufacturer)
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