1.640 O.D. Spring Shims .650 I.D. .060 Thickness

The 1.640 O.D. Spring Shims .650 I.D. .060 Thickness by COMP CAMS represent precision valve spring components engineered for high-performance engine builders and experienced mechanics who demand exact calibration of valve spring pressure. These hardened steel shims are essential for tuning valve spring installed height on modern performance and racing engines, allowing technicians to fine-tune seat pressure and open pressure without replacing entire spring assemblies. The set of 16 shims provides versatility across multiple cylinder heads and engine configurations.

Manufactured from durable steel with a 1.640-inch outer diameter and .650-inch inner diameter, each shim measures .060 inches in thickness—a common specification that allows stacking for incremental pressure adjustments. The precision-engineered tolerances ensure consistent load distribution across the spring seat, critical for preventing valve float at high RPMs and maintaining proper valve timing. COMP CAMS' reputation in the aftermarket performance industry is built on exacting manufacturing standards; these shims are produced to tight tolerances that eliminate deflection and guarantee reliable performance in both naturally aspirated and forced-induction applications.

Engine builders, performance shops, and serious enthusiasts rely on valve spring shims when upgrading camshaft profiles, installing aggressive valve springs, or correcting factory spring pressures on modified cylinder heads. Installation requires removal of the valve spring and positioning the shim between the spring seat and the spring itself; multiple shims can be layered to achieve the exact installed height specification required by your camshaft and spring combination. Compatibility extends across virtually all V-8 and inline applications using standard spring seat configurations; always verify your specific engine's spring seat diameter and inner bore before ordering to ensure proper fit.