How much horse power does a 4.8 liter gm motor?

The horsepower of a 4.8L GM engine varies significantly depending on the year of manufacture, the specific vehicle model it was installed in, and any modifications made to the engine. There's no single answer. You'll find horsepower ranging from approximately 270 hp to over 300 hp in various applications. To find the exact horsepower for a specific 4.8L GM engine, you need to know the year and model of the vehicle it's in.