Horsepower does motor 455 Oldsmobile have?

The horsepower of a 455 Oldsmobile engine varied significantly depending on the year of manufacture and the specific model of the car it was installed in. There's no single answer. Horsepower ranged from roughly 250 hp in lower-output versions to over 370 hp in high-performance models. To find the exact horsepower for a particular 455 Oldsmobile engine, you'd need to know the year and model of the vehicle it came from.