1.250 O.D. Spring Shims .814 I.D. .015 Thickness

The COMP Cams 1.250 O.D. Spring Shims .814 I.D. .015 Thickness (part number 4736-16) represent a critical precision component for high-performance valve spring applications. Supplied as a set of 16 shims, these hardened steel components are engineered to maintain exact valve spring pressures and control spring seat height within tight manufacturing tolerances. Proper shimming is essential for consistent valve timing, preventing spring surge, and ensuring long-term reliability under sustained RPM loads.

With an outer diameter of 1.250 inches and inner diameter of .814 inches, these shims are designed for compatibility with standard valve spring assemblies found in many performance and stock engine applications. The .015-inch thickness specification allows for precise adjustment in 0.015-inch increments—a common requirement when dialing in spring pressure to match camshaft lift, rocker arm geometry, and valve train dynamics. Multiple shims can be stacked to achieve exact pressure specifications without compromising spring frequency or introducing binding conditions.

Engine builders, performance technicians, and serious enthusiasts rely on COMP Cams valve spring shims when assembling or rebuilding high-output engines—from street performance applications to race-focused builds. Whether addressing spring pressure changes due to rocker arm ratios, adjusting for aftermarket camshaft profiles, or fine-tuning spring seat height on a complete cylinder head, this 16-piece set provides the flexibility needed for precise tuning. Each shim maintains concentricity and flatness critical to preventing uneven spring loading and potential valve train failure under load.