How much horsepower does a 1978 Chevy 454 have?

The horsepower of a 1978 Chevy 454 varied significantly depending on the specific model and trim level of the vehicle it was in. There wasn't a single horsepower rating. You could find them ranging from approximately 230 hp to 270 hp, and even higher in some performance applications. To know the exact horsepower for a particular 1978 Chevy 454, you would need to know the specific vehicle's model (e.g., Silverado, K5 Blazer) and engine code.