Steel C/M Spring Seats - 1.550 x .680 x .520

The Steel C/M Spring Seats - 1.550 x .680 x .520 by PAC RACING SPRINGS are precision-engineered components designed for builders and mechanics who demand predictable valve train geometry and consistent spring preload across a range of engine builds. These spring seats form the critical interface between your coil spring and the cylinder head, directly influencing valve lift accuracy, spring rate consistency, and overall engine reliability.

Manufactured from hardened steel, these spring seats resist the cyclic compression and lateral forces generated by valve spring oscillation, maintaining dimensional stability and seat flatness under sustained RPM loads. The 1.550-inch OD, paired with the .680-inch ID and .520-inch height, provides a compact footprint suitable for OEM and aftermarket cylinder head configurations where space constraints or spring package compatibility require compact seating geometry.

PAC RACING SPRINGS' manufacturing tolerances ensure a consistent mounting surface that minimizes spring side-loading and reduces harmonic resonance—critical factors in controlling cam lobe wear and extending component lifespan in both naturally aspirated and forced-induction applications. These spring seats are ideal for engine builders working with late-model small-block and mid-block engines.