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Our Edelbrock Performer LT1-equipped 350 doesn't have much visual punch to show for it, but there's another 34 rearwheel horsepower lurking under those valve covers. The street price on the assembled heads runs about $520 a piece. The cam is around $250 and the throttle body runs about $310. Edelbrock's own testing showed a 73-hp gain on a healthier LT1 Corvette.