S&S Rocker Arm Guardian Kit - M8Serious protection for serious builds. The S&S Rocker Arm Guardian Kit reinforces your Milwaukee Eight valvetrain with stronger shafts, studs, head bolts, and forged 1. 640 ratio roller rockers built for high lift cam setups and increased cylinder pressure. What It Does Strengthens rocker shafts and head fasteners Reduces valvetrain flex and wear Improves geometry for high lift cams Direct oiling to valve springs for better cooling Serviceable,