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

The COMP CAMS Spring Shims .030x.520 IDx1.300 OD for GM LS Series engines are precision valve train components engineered to fine-tune valve spring seat pressure in high-performance and stock LS engine builds. These 0.030-inch steel shims are critical adjustment tools for engine builders and performance technicians who need to dial in exact spring preload specifications.

Each shim in this 16-piece set measures 1.300 inches in outer diameter and 0.520 inches in inner diameter, with a thickness of 0.030 inches. These dimensions are designed to stack beneath valve springs on LS cylinder heads, allowing builders to achieve precise seat pressure without spring bind or excessive pressure that accelerates component wear. Steel construction provides dimensional stability and durability across thousands of engine cycles. The set of 16 shims provides flexibility for multi-cylinder tuning or backup inventory on the bench.

This product targets engine builders, performance shops, and serious enthusiasts working on LS engine builds—from stock restorations requiring OEM-correct spring pressures to high-RPM fuel-injected and supercharged applications. Proper shim selection and stacking is essential for maintaining valve control, preventing float, and protecting cam lobes and rocker arms from accelerated wear. Whether preparing a truck platform engine for increased boost or restoring a factory LS build to specification, shim selection directly impacts reliability and performance longevity.

LS platform engines—used across Chevrolet, GMC, and Cadillac applications since 1997—benefit from aftermarket valve spring components that allow tuning beyond factory parameters. COMP CAMS shims are recognized industry-wide as precision components trusted in drag racing, road racing, and street performance builds. This 16-count set offers practical quantity for a complete engine build or multiple projects.