.660" Polished Dual Spring Kit

The Texas Speed & Performance .660" Polished Dual Spring Kit is a performance-oriented valvetrain solution engineered for high-lift applications. Developed in collaboration with PAC Racing, this kit uses polished dual springs to enhance fatigue resistance and durability without compromising pressure, providing stable control for aggressive hydraulic roller camshafts. The kit features an innovative, patent-pending Precision Race Components integrated seat and seal design. This setup streamlines the installation process by ensuring proper seat and seal alignment while preventing common issues like seal tearing or detachment during assembly. The kit includes titanium retainers to minimize valvetrain mass. Additionally, it will not work on LS7, LS9, or any Gen 5 LT1/4 engine applications. The kit utilizes GM factory valve stem locks, which are not included. Install height is 1.810", with a closed spring pressure of 160 lbs. and an open spring pressure of 415 lbs. at .660" lift.