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Manley Performance NexTek valve spring kit for GM LS and LT applications supplies a complete high-lift valvetrain solution rated to 0.660" max lift, combining NexTek chrome-silicon springs with lightweight titanium retainers (+.050" installed height) and matching hardware. The kit includes I.D. spring locators, 7° machined valve locks and Viton valve stem seals. Springs are shot-peened for fatigue life and the titanium retainer reduces mass without sacrificing strength; achievable max lift depends on cylinder head and installed height.
Manley GM LS Series .660in Max Lift Valve Spring and Retainer Kit
