1.250 O.D. Spring Shims .814 I.D. .030 Thickness

The 1.250 O.D. Spring Shims .814 I.D. .030 Thickness is a precision component designed for engine builders and performance enthusiasts who require precise valve spring control. These shims are used to adjust preload height and maintain spring pressure across various RPM ranges. Proper shim selection is crucial for ensuring reliability and optimal power delivery in engine performance.

Manufactured to tight tolerances, each shim features a 1.250-inch outer diameter, .814-inch inner diameter, and .030-inch thickness. This profile allows for fine adjustments, enabling users to stack multiple shims to achieve the desired preload without needing to replace springs. The precision-ground flat surfaces ensure solid seating on the spring seat and retainer, which helps prevent wear and maintain performance.

These shims are particularly beneficial when installing aggressive cam profiles or upgrading to stiffer springs. They can also be used to correct spring pressure in older engines where original shims may have compressed. While they are compatible with many small-block and big-block applications, users should verify compatibility with their specific engine setup.