How much horsepower does a GM 4.3 vortec liter engine have?

The horsepower of a GM 4.3L Vortec engine varies significantly depending on the year of manufacture and the specific application (truck, van, etc.). There's no single answer. Power output ranged from roughly 160 to 200 horsepower across its production run. To find the exact horsepower for a particular engine, you need to know the year and model of the vehicle it was in.