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

S&S Cycle valve spring kit for 2017+ Harley-Davidson Milwaukee-Eight (M8) engines, engineered to support high-lift camshafts up to .605 in. A complete package with springs, retainers, collars, and seals all made in the USA.

Features

• High-performance conical single-wire spring design
• Supports cams up to .605 in. lift
• Includes springs, top collars, keepers, and bottom collar/seals
• Made in USA

Specifications

• Brand: S&S Cycle
• Manufacturer Part #: 900-0958
• Category: Engine Components / Valve Springs, Retainers
• Weight: 1.2 lb

Fitment

Fits Harley-Davidson 2017 and newer Milwaukee-Eight (M8) engine models.

Frequently Asked Questions

What lift range do these springs support?

These springs work with cams up to .605 in. valve lift. Higher-lift cams may require a different spring set.

What's included in the kit?

Springs, top collars, keepers, and bottom collar with seals — everything needed for a complete valve spring replacement.

Are these made in the USA?

Yes — S&S Cycle manufactures these springs domestically.

Do I need new pushrods or rocker arms with these springs?

Springs alone typically do not require pushrod or rocker changes, but verify cam-to-head clearance when installing a new cam.