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Crane Rocker Studs

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The net lash (nonadjustable) stock valvetrain won't work with a 502/502 cam, so we used 1.7:1 roller rockers from GM Performance Parts and Crane rocker studs. Our engine had a 0.022-inch deck height, 4cc dome pistons, 0.041-inch-thick head gaskets, and 118cc chamber heads for a compression ratio of 8.69:1. That's slightly less than the crate-version compression ratio of 8.75:1, and the aluminum heads dissipate more heat than iron, both of which result in a slight loss of power. Machining the heads to reduce the combustion chamber would bring up the compression ratio.

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