Valve Spring Kit. Fits Big Twin 1966-1977. .600in. Lift - Kibblewhite

Note: Maximum Recommended Lift = .600"

* Chromium-Silicon (CrSi) valve springs are high-tensile, durable steel alloys designed for high-performance engines

* 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.