Valve Spring Kit. Fits Big Twin 1948-1984. .590in. Lift - AV&V

Note: Maximum Recommended Lift = .590"

* High Performance Spring Kit

* Silicon & Vanadium alloy spring wire

* Increased travel before coil bind

* Complete Kit includes: springs, retainers, keepers & lower collars

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.

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