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The ZZ502 is rated at 502 hp at 5,200 rpm and 567 lb-ft of torque at 4,200 rpm. After a little tuning, we nailed down 582 horses at 5,600 rpm and 594 lb-ft at 3,900. In addition to the gains of both torque and horsepower, we also liked how peak torque came on lower and how the 502 pulled farther than it did in stock form. Even if you account for some variance between GM's dyno and ours, that's a pretty decent gain.