CHEVROLET LS SERIES V8. Premium quality Gold Nitrided ‘PACALOY’ Beehive Valve spring set. For use with OEM retainers, Titanium retainers are also available. 130lb at 1.800″, 360lb @ .600″, Coil Bind at 1.10″, 385lb/in rate. Requires a custom spring base if used in LS7