The Alfa Romeo P3, based on the earlier Alfa Romeo P2, was powered by a supercharged 2.9L (2,905 cc) inline-8 engine. The car was very light for the time period, weighing just over 1500 lb (680 kg) despite the use of a cast iron engine block.
In the 1934 Grand Prix season, the Alfa Romeo P3's engine was raised to 2,905 cc in displacement so as to counteract larger bodywork requirements brought forth by the 1934 Grand Prix season regulations. The P3s won 18 of all 35 Grand Prix events held throughout Europe.
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