1.250 O.D. Spring Shim Kit 16 Ea .015-.030-.060

The COMP Cams 1.250 O.D. Spring Shim Kit is an essential precision component for serious engine builders and performance enthusiasts who demand exact valve spring heights and installed heights. This 16-piece assortment is designed for fine-tuning valve spring geometry on high-performance camshaft installations, where even thousandths of an inch variations can affect valve lift, duration, and overall engine performance.

These shims feature a 1.250-inch outer diameter and come in three precision thicknesses—.015, .030, and .060 inches—allowing you to stack and customize spring height adjustment in small, controlled increments. The kit's 16-piece composition provides multiple combinations to achieve the exact installed height your valve springs require, accounting for variations in block deck height, head milling, gasket thickness, and cam base circle diameter.

Proper installed height ensures the valve spring maintains consistent pressure throughout the lift cycle, prevents over-compression that can compromise spring longevity, and eliminates under-compression scenarios that lead to valve float or loss of lobe control at high RPM. Mechanics and engine builders working with COMP Cams products or any performance camshaft application will find this kit invaluable for achieving optimal engine performance.