There's no single answer to how much horsepower is in an "average" 6.1L Hemi V8 because the output varied depending on the year and the specific vehicle it was installed in. Different models and even different years of the same model sometimes had variations in tuning resulting in different horsepower ratings.
You'll need to specify the *exact* year and model of the vehicle to get the precise horsepower figure. For example, a 2005 Dodge Charger with the 6.1L Hemi will have a different horsepower rating than a 2008 Chrysler 300C with the same engine.
