18. Exhaling through a set of custom Outlaw Motorsports 2-inch headers, the 454 Windsor strained the SuperFlow 901 dyno at Bob Earleywine Performance (Winchester, California) with 731 hp at a very street-friendly 6,700 rpm. Torque checked in at a pavement-ripping 632 lb-ft at 4,900 rpm. That’s not too shabby for a combo that burns 91-octane pump gas. The motor responded best to 34 degrees of total timing, and thanks to the camshaft’s wide 112-degree LSA, it idled at a modest 1,000 rpm.