.660" Dual Valve Spring Kit with Titanium Retainers

The Texas Speed & Performance .660" Dual Valve Spring Kit is designed to provide superior valvetrain control for Chevrolet Gen III IV LS engines, particularly those utilizing aggressive hydraulic roller camshafts. This kit features American-Made PAC Racing Polished Dual Valve Springs with a .660" lift rating. Key components of this kit include patent-pending Precision Race Components integrated seat and seal, which simplify installation by eliminating the need for special tools for valve seals and preventing them from tearing or popping off. These integrated units are compatible with factory-size valve guides but cannot be used with aftermarket bronze guide applications. The kit also includes lightweight titanium retainers for improved valvetrain response. The springs provide 160 lb. of closed spring pressure at 1.810" installed height and 415 lb. of open spring pressure at .660" lift, with a coil bind at 1.015". It is important to note that this dual valve spring kit utilizes GM factory valve stem locks, which are not included. Furthermore, this kit is explicitly not compatible with LS7, LS9, any Gen 5 LT1/4 engine applications, and most aftermarket cylinder heads that feature bronze guides.