S&S CYCLE Rocker Arm Guardian Kit M8

Rocker Arm shafts, Rocker Arm Stud Kit, Head Bolt Kit and Performance Roller Rocker Arms are included in this kit. Rocker Arm Shafts. Replace broken or worn OEM pieces with stronger, more durable S&S performance parts. Direct replacement for stock parts. Hardened and surface ground for ultimate precision and durability. Rocker Arm Stud Kit. Extend the life of your cylinder heads. Prevent damage to Rocker Arm Towers. Install studs and safely re-torque nuts. Black Oxide Finish. 12 pt Nuts. Head Bolt Kit. Heat Treated 8640 Steel. 200,000 psi ultimate tensile strength. 14% increases in strength over stock. Stronger material than stock Head bolts. Durable Black Oxide Coating. 9/16" 12-point head with integral washer. Formed threads. Cold Formed Head. Reusable. Forged Roller Rocker Arms. Forged from 8620 steel for greater strength. Designed using Finite Element Analysis (FEA). Rollers eliminate thrusting on valves for decreased wear on the valve train. Rocker geometry is better suited to high lift cams. Larger surface area on the thrust surfaces reduces wear on the heads. Bushings are 50% longer than stock, increasing time between rebuilds. Compatible with stock or S&S CNC heads. Oil is sprayed directly on the valve springs, reducing potential for breaking a valve due to over-heating (stock rockers tend to oil the rocker boxes, not the valves). 1.640 Ratio. Capable of .650" max Valve Lift. Serviceable and rebuildable for generations of durabilty. A must have for cams with .550" or greater lift