What were the horsepower and torque ratings for a 1976 454 Chevy truck engine?

There's no single answer to the horsepower and torque ratings for a 1976 454 Chevy truck engine. The output varied significantly depending on the specific engine configuration and its application (light-duty vs. heavy-duty truck). Chevrolet offered several versions of the 454 cubic inch (7.4L) big-block V8 in 1976, each with different carburetion, camshafts, and other internal components that affected performance.

You'll need to know more specifics about the engine to find the exact ratings. Look for information on the engine casting number (located on the block itself) or a specific engine code (often found on a sticker or data plate under the hood). With that information, you can research the exact specifications.

Generally, expect horsepower ratings in the range of 240 to 270 hp, and torque ratings between 360 and 400 lb-ft. But again, this is a broad range, and the actual numbers could be higher or lower depending on the specific engine.