Roller rocker arms have lower friction than standard rocker arms. Additionally, they can accommodate the higher lift camshaft profiles used in modern performance engines. Stud mounted roller rockers necessitate the use of poly locks for adjustment. Poly locks consist of an outer adjusting nut and an inner locking screw. This allows for precise adjustment of valve lash, and positive locking. Valve lash is a function of camshaft design. If you don't have the proper valve lash specifications for your engine, contact your camshaft supplier.
Turn the crankshaft until the piston is at the top of its compression stroke. Both the intake and exhaust valves will be completely closed.
Loosen the poly lock. Hold the outer hex with the 9/16-inch wrench and loosen the locking screw by turning the Allen wrench counterclockwise. Once the poly lock is unlocked, loosen it one half turn using the wrench.
Adjust the valve lash. Place the correct feeler gauge between the tip of the valve and the roller tip of the rocker arm (note that intake and exhaust valves have different lash settings). Tighten the poly lock until the feeler gauge is pressed firmly between the valve and the rocker arm. Holding the outer hex with the 9/16-inch wrench, tighten the locking nut using the Allen wrench.
Continue with Steps 1-3 until all of the valves have been adjusted.
