Trucks of Fury.

Ford upped low-end torque for the Raptor R with a smaller supercharger pulley, at the cost of 60 horses at the top end. For Raptor duty, Ford's supercharged 5.2-liter V-8 gets a truck tune that fattens up the torque curve, delivering 640 pound-feet at 4250 rpm. The Raptor R's engine is a supercharged 5.2-liter V-8 based on the 760-hp Predator found in the Mustang GT500. [Extracted from the article]