What ratio of horsepower to displacement did the 1957 fuel-injected Corvette achieve?

The 1957 fuel-injected Corvette achieved a ratio of 1 horsepower per cubic inch.

That figure came from the optional Rochester Ramjet mechanical fuel-injection system fitted to Chevrolet’s new 283-cubic-inch V8. The top version was advertised at 283 horsepower, producing the memorable 283-to-283 relationship that Chevrolet promoted as “one horsepower per cubic inch.”

Fuel injection was a major advance for the Corvette. The Rochester system, developed through GM’s Rochester Products division, helped the small-block deliver more power than the carbureted versions and strengthened Chevrolet’s performance image. The option became available during the 1957 model year.

The claim refers to the engine’s advertised rating, not a modern dynamometer comparison. Period horsepower figures used older SAE gross standards, and some historians note that the engine’s actual output may have exceeded its official rating. The result was still an important milestone in American production-car marketing and Corvette history.