Steel C/M Spring Seat - 1.500 x .715 x .570

The Steel C/M Spring Seat by PAC Racing Springs is a precision-engineered valve spring locator designed for high-performance engine builds and race applications. Built from chromoly steel, this component serves as the critical interface between your valve spring and the cylinder head, ensuring proper spring geometry and load management during demanding operation. Whether you're assembling a naturally aspirated stroker engine, preparing a competition car, or restoring a classic with modern valve train upgrades, the correct spring seat specification is non-negotiable for reliability and peak performance.

Engineered to exacting tolerances, the Steel C/M Spring Seat features a 1.500-inch outer diameter with a 0.715-inch spring ID and 0.570-inch inner diameter, combined with a 0.030-inch wall thickness that balances structural rigidity with precise spring seating. The chromoly steel construction provides superior fatigue resistance compared to standard steel, critical when springs cycle thousands of times per minute under high RPM conditions. This inside-mount configuration allows the spring to nest securely within the seat, preventing lateral movement and maintaining consistent preload—essential for valve control, accurate valve timing, and long-term durability in any performance engine program.

Mechanics, engine builders, and automotive enthusiasts working with aftermarket valve spring kits will appreciate the precision fit and material quality that PAC Racing Springs brings to every component. The compact footprint and lightweight design (0.5 lbs) make installation straightforward, though proper seating and alignment with your specific cylinder head and spring combination is critical. This spring seat pairs seamlessly with matching spring packages and is essential for anyone upgrading to higher-lift camshafts, aggressive valve events, or building vintage-correct engines with modern performance standards. Always verify bore and seat specifications against your engine block and spring kit documentation for guaranteed fitment.