How much horsepower dose a 6 liter gm engine have?

There's no single answer to how much horsepower a 6-liter GM engine has. GM has produced many different 6-liter engines over the years for various vehicles, and their horsepower varies significantly depending on the application, year, and specific engine code. The horsepower can range from well under 300 hp to over 400 hp, and even higher in some supercharged or modified versions.