S&S Cycle Top End Kits — Harley-Davidson Street Glide, Softail Fat Boy 114, Road King Special (2017-2026)

S&S Cycle Top End Kit for Harley Milwaukee-Eight engines bundles forged rocker arms, upgraded head bolts, rocker arm shafts, and stud kits into a single valvetrain package. Each component is engineered for high-horsepower builds where stock parts would fail.

Features

• Heat-treated 8640 steel head bolts with 200,000 psi tensile strength — 14% stronger than OEM
• Forged 8620 steel roller rocker arms designed via Finite Element Analysis
• Replacement rocker arm shafts for worn or broken OEM pieces
• Rocker arm stud kit to extend cylinder head life

Specifications

• Brand: S&S Cycle
• Manufacturer Part #: 900-1092
• Category: Engine Components / Heads
• Weight: 8.9 lb

Fitment

Fits Harley-Davidson Milwaukee-Eight (M8) engines.

Frequently Asked Questions

What's included in this kit?

Head bolt kit, forged roller rocker arms, rocker arm shafts, and rocker arm stud kit — everything needed for a top-end overhaul.

Will these bolt onto my stock M8 heads?

Yes — S&S parts are direct replacement for OEM components. Stock heads will work with this kit.

Do I need to upgrade my cam or pushrods with this kit?

This kit addresses the valvetrain top end only. Consult S&S or your builder about complementary upgrades like cams or pushrod kits.

Are these suitable for high-horsepower builds?

Yes — the 14% stronger head bolts and forged rocker arms are designed to handle elevated power outputs where stock parts fail.

Do I need a machine shop to install this?

Head and rocker arm work typically requires professional assembly. Consult a qualified M8 builder or S&S technical support for installation guidance.