1.437 O.D. Spring Shims .645 I.D. .060

The 1.437 O.D. Spring Shims .645 I.D. .060 from Comp Cams are precision-engineered valve spring shims designed for engine builders and performance technicians who demand exact valve train geometry. Available as a set of 16 units, these shims allow critical adjustments to valve spring pressure and installed height—essential for tuning camshaft profiles, controlling valve float, and optimizing engine performance across racing, performance, and rebuild applications. Whether you're dialing in a stock rebuild or fine-tuning a high-RPM racing engine, proper shim selection prevents premature valve seat wear and ensures consistent valve timing.

Manufactured from hardened steel, each shim measures 1.437 inches outer diameter with a .645 inch inner diameter bore and .060 inch thickness. The precise dimensions allow them to seat directly under valve springs, providing load adjustments without modifying spring rates themselves. Steel construction ensures durability under repeated thermal and mechanical stress, while the standardized thickness (.060 inch) integrates seamlessly with OEM and aftermarket valve spring assemblies. The set of 16 provides flexibility for multi-cylinder engines or allows substitution during troubleshooting and optimization cycles.

Engine builders, performance shops, and serious enthusiasts rely on these shims to achieve precise valve spring installed heights and maintain correct preload across the powerband. Installation is straightforward—position the shim under the spring, above the retainer, during top-end assembly. Compatibility spans small-block and big-block engines using comparable spring diameters; verify your spring's outer diameter before ordering. For competitors and street performance builds alike, accurate shim sizing prevents valve float, reduces wear, and maximizes cam profile efficiency.