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

The PAC Racing Springs Steel C/M Spring Seats (PACPAC-S110-16) are precision valve spring retainers engineered for high-performance engine builds where reliability and repeatability matter. These chromoly seats function as the critical interface between your valve springs and cylinder head, controlling spring pressure and geometry under extreme combustion loads. Whether you're building a street performance engine, racing application, or restoring a classic with modern internals, these seats ensure consistent valve timing and prevent spring surge across the entire RPM range.

Constructed from durable chromoly steel, these spring seats deliver the strength needed to handle sustained high-valve lift and aggressive spring pressures without deflection or wear. The inside diameter configuration (0.570 in ID) accommodates smaller diameter springs common to compact, modern heads, while the 0.715 in spring ID and 1.500 in outside diameter provide optimal load distribution and stability. At 0.060 in thickness, each seat maintains dimensional accuracy crucial for proper spring bind height—critical for valve train geometry and preventing coil bind damage during operation. The set includes 16 pieces, providing coverage for an 8-cylinder engine or allowing extras for testing and installation verification.

Mechanics and engine builders favor PAC Racing spring seats for applications requiring lightweight, high-revving reliability—from LS-series builds to modern 4-cylinder forced induction platforms. Installation requires cylinder head preparation and proper seating to ensure uniform spring pressure across all valves, eliminating the inconsistencies that come from worn OEM retainers. Verify compatibility with your specific cylinder head design and spring specifications before purchase; proper seat selection is fundamental to avoiding valve float and maintaining engine durability at elevated RPM.