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Manley Performance NexTek valve spring kit for GM LS and LT series offers a complete valvetrain upgrade up to 0.660" max lift, engineered for durability and consistent control at high rpm. The all-inclusive kit contains chrome-silicon NexTek springs, 7° steel retainers (+.050" installed height), I.D. spring locators, machined valve locks and Viton valve stem seals. NexTek springs are shot-peened for fatigue resistance; max lift can vary with cylinder head and installed height.
Manley GM LS Series .660in Max Lift Valve Spring and Retainer Kit
