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

The Steel C/M Spring Seats by PAC Racing Springs (model PAC-S133-16) are precision valve spring locating components engineered for high-performance engine builds and racing applications. These spring seats serve as the foundation for proper valve spring seating, ensuring consistent spring preload and eliminating lateral spring movement under extreme operating conditions.

Manufactured from durable steel, these spring seats feature precision-machined dimensions (1.650 x .630 x .570 inches) that maintain tight tolerances essential for proper spring concentricity and load distribution. The steel construction delivers superior hardness and wear resistance compared to softer materials, preventing deformation under sustained high-spring loads and thermal cycling.

PAC Racing Springs' design ensures repeatable fitment and eliminates runout issues that can compromise valve train stability, bind springs, and accelerate component wear during sustained high-rpm operation. These spring seats are ideal for engine builders, performance shops, and enthusiasts assembling custom short-block assemblies or cylinder head packages, integrating seamlessly into dual-spring and single-spring configurations across a wide range of domestic and import engine platforms.