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10 With the Power Heads cylinder heads bolted on top of the 289, it was time to finish off the valvetrain. Comp Cams supplied the matching pushrods and rocker arms for the cam and lifter kit we installed while building the short-block. John insisted on using Comp's Polylocks instead of the originally supplied jamb nut. He prefers Polylocks and uses them on any engine that gets an adjustable valvetrain.