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These are LS3-style heads so the rockers needed to be the proper type with offset intakes. These full roller pieces from Yella Terra (PN YT-6668, $498) are both lightweight and are some of the strongest rockers out there. The extruded, heat-treated, aluminum rockers are stud mounted and feature strong cross shafts for better stability at high rpm. Best of all, they fit without any grinding of the head or the rockers.