Jesel's J2K Millennium Series shaft rocker arms systems feature tool steel lash adjusters in an ultra-light .750-inch aluminum body. The rocker body is shot-peened, equipped with a .250-inch needle nose roller and available in a variety of ratios. The innovative .375-inch shaft eliminates the need for spacers or snap rings. Jesel includes a full complement of ARP fasteners with their J2K systems. ARE specified a 1.7:1 rocker ratio for this engine. This rocker system makes for a rock-solid valvetrain. The only real disadvantage to running a solid roller cam is that they require periodic valve adjustments. Many assume that lashing the valves is a difficult and time-consuming proposition, but it is really quite an easy task. With the engine at operating temperature, a feeler gauge is inserted between the valve tip and the roller on the rocker arm. ARE recommended the lash for these valves be set at .024 inch.