How much horsepower does a truck Chevy 400 4bbl have?

The horsepower of a Chevy 400 small-block V8 with a 4-barrel carburetor varied considerably depending on the year of manufacture and the specific vehicle it was installed in. There's no single answer. Output ranged from approximately 150 to 250 horsepower. To get a precise figure, you'd need to know the exact year and model of the truck.