What were the horsepower and torque ratings for 1 1977 454 ton Chevy truck engine?

The 1977 Chevy 454 engine in a C10 (heavy-duty) pickup truck didn't have a single horsepower and torque rating. The output varied depending on the specific configuration. GM offered several versions of the 454 for trucks that year, each with different carburetion, camshafts, and other components leading to different power numbers.

You'll find published figures ranging from approximately 230 to 270 horsepower and 360 to 400 lb-ft of torque. To know the *exact* horsepower and torque for a specific 1977 Chevy 454 truck engine, you would need to find the engine's RPO (Regular Production Option) code from the vehicle's data plate (often located on the driver's side doorjamb) or build sheet. The RPO code would identify the specific engine configuration.