Valve Spring Shims 1.625in x .030in

Manley Valve Spring Shims 1.625in x .030in are precision-engineered components designed for serious engine builders and performance enthusiasts looking to fine-tune valve spring pressure and seat height in high-performance applications. These shims sit beneath the valve spring and above the spring seat, allowing you to adjust preload geometry without replacing entire spring assemblies. Whether you're building a naturally aspirated stroker, preparing a forced-induction platform, or dialing in a race engine, these shims provide the control needed to optimize cam profile compatibility.

The 1.625-inch outer diameter with a 0.030-inch thickness places these shims in the sweet spot for mid-to-large displacement applications and dual-spring setups common in small-block and big-block platforms. Manley's manufacturing tolerances ensure consistent material quality and flatness, preventing binding or misalignment that could compromise valve train reliability under boost or extreme RPM. Stacking multiple shims allows incremental height adjustments, giving builders the flexibility to achieve exact spring pressure curves without switching complete spring kits.

These shims are essential for anyone upgrading camshafts, installing aftermarket rocker arms, or modifying head geometry on carbureted and fuel-injected engines alike. They're particularly valuable when transitioning between different spring setups or making last-minute calibration adjustments during dyno tuning. With their versatility and precision, these shims are a must-have for any performance engine build.