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Visually the 1957 Corvette was a near-twin to 1956. Engine displacement increased to 283 cu in (4.6 L), fuel injection became optional and a 4-speed manual transmission was available after April 9, 1957. Fuel injection first saw regular use on a gasoline engine two years prior on the 1955 Mercedes-Benz 300SL "Gullwing". Although the Corvette's GM-Rochester mechanical fuel injection used a constant flow system, as opposed to the diesel style nozzle metering system of the Mercedes', the Corvette's engine nevertheless produced about 290 hp.
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