Upper valve rain pieces go on next. After lubing the ends of the Comp Cams Magnum pushrods (PN 7693-16), John dropped with into the lifter cups. The hardened pushrods are 5/16-inch in diameter, have a wall thickness of 0.080-inch, are 7.900-inches long (0.100-inch longer than stock), and designed to be used with guide plates. The Comp Cams Pro Magnum 1.52:1 roller rockers (PN 1301-16) are made of 8650 chrome-moly steel, but carry 5-percent less weight at the valve train than most aluminum rockers. They also boast a lifetime guarantee.