.660" Lift Dual Valve Spring Kit with Titanium Retainers

The Texas Speed & Performance TSP-PACPOL660SPRINGKIT is an advanced dual valve spring kit designed for optimal valvetrain control, even with aggressive hydraulic roller camshafts. This kit features American-made PAC Racing polished dual valve springs, rated to .660" lift, and includes patent-pending Precision Race Components integrated seat and seal. This innovative design eliminates the need for special installation tools for valve seals, prevents tearing during installation, and ensures seals stay in place. The kit also includes lightweight titanium retainers. The PAC Racing springs are polished to enhance durability and longevity, reducing the risk of fatigue and failure without compromising pressure. These springs are suitable for use with factory-style lifters and maintain excellent stability and performance. The integrated seat and seal are compatible with factory-size valve guides but cannot be used on aftermarket bronze guide applications. Key specifications include an install height of 1.810", closed spring pressure of 160 lb. @ 1.810", open spring pressure of 415 lb. @ .660" lift, and a coil bind height of 1.015". This dual valve spring kit utilizes GM factory valve stem locks, which are not included. It will not work on LS7, LS9, any Gen 5 LT1/4 engine applications, and most aftermarket cylinder heads with bronze guides.