How Much Horsepower Does a Stock 454 Have?

American automotive giant Chevrolet’s original 454 big-block V-8 power plant produced 390 brake horsepower and 500 pounds of torque for the 1970 Corvette LS5 in which it debuted. Subsequent versions of the engine produced varying results.

Ambiguity surrounds the power production of the 454 engine from 1970 to 1976. The LS6 engine was rated at 450 horsepower, though empirical tests and popular opinions range from 350 to over 500 horsepower. The LS7 454 was initially rated at 465 horsepower, but it was advertised at 500 horsepower by the time it went on sale as a crate engine from General Motors. Over time, stricter government emissions standards decreased the power output of the engine’s later models before ending the 454 completely.