Spring Shims .030x.520 IDx1.300 OD GM LS Series

The Spring Shims .030x.520 IDx1.300 OD GM LS Series are precision-engineered components designed for fine-tuning valve spring seat pressure in GM LS Series engines. These shims are essential for both high-performance builds and stock restorations, providing engine builders and performance technicians with the tools necessary to achieve exact spring preload specifications.

Each shim in this 16-piece set features a thickness of 0.030 inches, an outer diameter of 1.300 inches, and an inner diameter of 0.520 inches. Constructed from durable steel, these shims ensure dimensional stability and longevity across thousands of engine cycles. They can be stacked beneath valve springs on LS cylinder heads to achieve precise seat pressure without risking spring bind or excessive pressure that could lead to component wear.

This product is ideal for engine builders, performance shops, and enthusiasts working on LS engine builds, whether for stock restorations or high-RPM applications. Proper shim selection and stacking are crucial for maintaining valve control and preventing float, which protects cam lobes and rocker arms from accelerated wear. Whether preparing for increased boost or restoring to factory specifications, these shims play a vital role in enhancing reliability and performance longevity.