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10. For rockers, we decided to roll with a set of COMP Ultra Gold's we had left over from a previous build (PN 19004-14, $308). On this engine we could have gotten away with a lesser rocker, but the Ultra Gold’s are rock solid, and being full-roller, they will free up a bit of power. This did mean we needed to swap out the 3⁄8-inch rocker studs that came with the Summit heads for some 7⁄16-inch versions.