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One glance at the dyno chart is all it takes to notice that the upgraded parts made power all across the rpm band. Note the broad torque and horsepower curves. This torque monster is even more impressive, considering that it runs conservatively-ported iron heads and a hydraulic cam. When converting back to flywheel horsepower, a 20-25 percent factor is generally used for drivetrain losses, putting this Hand-powered engine around 500/600 crankshaft hp/tq.