TSP-LT1660 Dual Valve Spring Kit

The Texas Speed & Performance TSP-LT1660SpringKit is a high-performance dual valve spring kit engineered for Gen V LT4 engines. Developed in collaboration with PAC Racing, this kit utilizes advanced metallurgy and manufacturing techniques to provide superior valvetrain stability and durability for demanding builds. The springs feature a proprietary nano-peening process, which increases molecular density to significantly reduce spring fatigue and failure. Designed to support aggressive hydraulic roller camshafts up to .660" lift, this kit ensures excellent valve control and stability, even at high RPMs. The kit includes lightweight titanium retainers to reduce valvetrain mass and improve overall performance. Additionally, it comes with PRC integrated spring seats and valve seals for simplified installation and proper fitment. Key specifications include an install height of 1.810" with 160 lbs of closed spring pressure at that height, and an open pressure of 415 lbs at .660" lift. The coil bind is at 1.015". The kit utilizes factory GM valve stem locks, which are not included, and is compatible with factory-style hydraulic roller lifters. This kit is specifically designed for LT4 applications and is not compatible with other Gen V LT engines, including the LT1, L83, and L86.