How much horsepower does a 350 big block Chevy engine have?

The horsepower of a 350 cubic inch "big-block" Chevy engine is highly variable and depends entirely on the year of manufacture, specific modifications, and the intended application. There's no single answer. A stock 350 big block from a truck will have significantly less horsepower than a race-prepared version. Horsepower could range anywhere from less than 300 to well over 500, or even more with extensive modifications.