Valve Spring Shim Kit 1.250in OD .814in ID

The COMP Cams Valve Spring Shim Kit 1.250in OD .814in ID is a vital precision component for engine builders and tuners aiming to optimize valve spring pressures and seat heights during modifications. This kit is particularly useful for those working on naturally aspirated performance engines, stroker builds, or high-revving aftermarket setups, allowing for precise adjustments without the need to replace entire spring assemblies.

Manufactured to COMP Cams' stringent tolerances, the shims feature a 1.250-inch outer diameter and a .814-inch inner diameter, designed to fit beneath valve springs in most small-block and mid-size applications. These precision shims effectively raise the spring seat height, which increases installed pressure and addresses potential seat-to-coil bind issues that may arise when upgrading to stiffer cam profiles. The measured thickness of each shim allows for stacking combinations to achieve desired pressures without guesswork.

Serious engine builders depend on this valve spring shim kit when pairing aftermarket camshafts, ensuring compatibility and performance. The consistent material hardness and flatness of the shims are crucial in preventing premature spring failure and unwanted valve float at high RPM, making this kit an essential tool for any performance engine project.