S&S Cycle 900-1092 M8 Top End Guardian Kit Roller Rocker Arms & Head Bolts

The S&S Cycle 900-1092 Top End Guardian Kit is a valvetrain upgrade for high-performance M8 engine builds. It puts the parts that support the top end into one kit: rocker arm shafts, a rocker arm stud kit, a head bolt kit and performance roller rocker arms.

Key Features:

• Rocker arm shafts: direct replacements for stock parts. They are hardened and surface ground, and replace broken or worn OEM pieces.
• Rocker arm stud kit: helps extend cylinder head life and prevents damage to the rocker arm towers. It has a black oxide finish and 12-point nuts, and lets you install the studs and safely re-torque the nuts.
• Forged roller rocker arms: forged from 8620 steel and designed with Finite Element Analysis (FEA). The rollers reduce thrusting on the valves to cut valve train wear. The rocker geometry suits high-lift cams, and the bushings are 50% longer than stock.
• Oil is sprayed directly onto the valve springs. This reduces the chance of a valve breaking from overheating.

This kit helps keep the top end of a built M8 reliable as power and torque increase.