Steel C/M Spring Seats - 1.450 x .700 x .570

The PAC RACING SPRINGS Steel C/M Spring Seats are precision valve spring retainers engineered for high-performance engine builds where durability and reliability demand chromoly construction. These inside retainers are essential components in any serious cylinder head upgrade, designed to support aggressive valve spring rates and maintain consistent seating geometry under extreme load. Whether you're building a street performance engine or preparing a competition powerplant, these spring seats ensure your valve train stays controlled and repeatable.

Manufactured from chromoly steel, the PAC-S114-16 retainers feature a 1.450-inch outer diameter with a 0.700-inch spring ID bore and a 0.570-inch inner diameter, creating the precise contact surface your valve spring needs to transmit load efficiently to the valve stem. The 0.060-inch thickness provides optimal stiffness without introducing unnecessary mass that would compromise high-RPM stability. Each set includes 16 pieces (eight intake, eight exhaust), ready for a complete cylinder head application. The tight tolerances and material consistency prevent spring binding, valve float, and premature spring fatigue—critical concerns when running stiffer springs required by high-lift camshafts or forced-induction applications.

Professional engine builders and enthusiasts running modified or naturally aspirated performance heads rely on PAC spring seats to pair with PAC valve springs, roller rockers, and performance camshafts. These retainers are particularly valuable in LS, small-block Chevy, Ford, and Mopar builds where OEM retainers cannot handle the spring rates required for aggressive cam profiles. Proper installation requires checking spring pressure and seat concentricity to maximize valve train longevity and ensure consistent performance across all RPM ranges.