Valve Spring Kit. Fits Twin Cam 2005-2017, Sportster 2004-2021. Beehive Springs with .600in. Lift.

Note: Maximum Recommended Lift = .600"

* Beehive steel valve spring kit

* Use with OEM style AVV guide seals

* Fits both Single & Triple groove valves

* Ultra pure chrome silicon+Nickle spring wire

* Extra processing for fatigue resistance

* Resist pressure loss & fatigue associated with extremely aggressive cams in high compression engines

* Reduce vibration & harmonics

* Includes springs,retainers & upper & lower collars

* 162lbs @ 1.860, 340lbs @ 1.260"

* coil bind 1.200"

* Small end ID = .650", OD= 1.085"

* Large end ID = 1.000", OD = 1.445"

* CNC machined keepers

* Replaces OEM # 18013-03A

Tech Tips:-

* Rocker box clearance must be checked

* Spring travel must be checked

* Valve timing must be accurate

** Over revving will lead to pre-mature failure of Valve Springs & collars.