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Stock vs. Modified - Graphs tell so much more than simple peak power numbers. Adding the ported heads, intake, and Comp cams to the 4.6L, Four-Valve motor offered dramatic power gains. The peak power outputs jumped from 336 hp and 332 lb-ft of torque to 435 hp and 409 lb-ft. The combination improved power output through the entire rev range, with sizable torque gains coming down as low as 3,500 rpm. Credit the time spent degreeing the cams for some of the additional power.