Description
If you’re running aggressive valve timing or high-rpm applications on your M8, stock valve springs simply won’t cut it—you’ll lose power and risk catastrophic valve float. The S&S Cycle Spring Kit is engineered to handle the demands of forced induction and elevated boost levels while maintaining precise valve control at peak engine speeds. This is a complete solution that keeps your valvetrain stable and responsive, whether you’re on the dyno or the street.
What you’re getting here is S&S’s proprietary dual-spring design—the result of decades of Harley-Davidson engine development. The kit includes everything needed for a full valve spring replacement, so you won’t be hunting down individual components or dealing with incomplete assemblies.
- Dual-spring design, valve float prevention
- 1.800″ installed height
- 130 lb. seat pressure
- 325 lb. maximum lift pressure
- Includes springs, collars, shims, seals
- Made in the U.S.A.
- M8 fitment
- S&S MPN 900-0958
- Bolt-on installation
