Steel C/M Spring Seat - 1.650 x .630 x .570

The Steel C/M Spring Seat (PAC-S133) is a precision-engineered valve spring component designed for high-performance engine builds and race applications. This spring seat is essential for maintaining consistent spring pressure and preventing deflection under extreme valve train stress, making it a critical component for both performance enthusiasts and professional engine builders.

Manufactured from hardened steel, the Steel C/M Spring Seat features precise dimensions of 1.650 inches outer diameter, 0.630 inches inner bore, and 0.570 inches height. This design ensures compatibility with mid-range spring packages commonly used in small-block and mid-block applications. The precision-ground surfaces guarantee zero runout when installed, which is vital for maintaining the concentricity of the spring assembly.

Engine builders and technicians favor this spring seat for LS-family engines, small-block Chevrolets, and similar platforms that require aftermarket cylinder head packages. Its lightweight design minimizes inertial mass, while the robust steel construction resists deformation during high-RPM operation, preventing issues such as valve float. Proper installation is crucial, requiring careful orientation to ensure optimal performance.