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

S&S Cycle rocker arms for Harley Milwaukee-Eight engines, forged from 8620 steel with roller contact surfaces to reduce valve train wear under high-lift cam profiles. Engineered with FEA and designed to handle .550 in. lift and greater without compromising valve train longevity.

Features

• Forged 8620 steel construction
• Roller contact surfaces eliminate valve thrust and wear
• Optimized geometry for high-lift cam applications
• Supports .650 in. maximum valve lift
• 1.640 rocker ratio
• Designed using Finite Element Analysis (FEA)

Specifications

• Brand: S&S Cycle
• Manufacturer Part #: 900-1084
• Material: 8620 Steel
• Rocker Ratio: 1.640
• Max Valve Lift: .650 in.
• Weight: 4.2 lb
• Category: Engine Components / Rocker Arms

Fitment

Fits Harley-Davidson Milwaukee-Eight (M8) engines, particularly those running high-lift camshafts of .550 in. lift or greater.

Frequently Asked Questions

Will these work with stock M8 cams?

Yes, but they are engineered for high-lift cam applications (.550 in. lift and above). They will work with stock cams but provide maximum benefit with performance cams.

Do I need rocker arms if I'm upgrading to a .550+ lift cam?

S&S recommends upgraded rocker arms for cams with .550 in. lift or greater to protect the valve train from excessive wear.

What's the maximum valve lift these handle?

.650 in. maximum. Cams exceeding this lift require different rocker geometry.

What material are these forged from?

8620 steel, chosen for high strength and durability under high-lift cam loads.

Do the roller surfaces require special maintenance?

Standard engine oil lubrication is sufficient. Rollers reduce valve train friction and wear compared to traditional non-roller designs.