SKU: COM4753
UPC: 036584391722
MPN: 4753CPG
The COMP Cams 1.250 O.D. Spring Shim Kit represents a precision engine-building component designed for serious performance builders and engine rebuilders who demand exact valve spring heights. This 16-piece kit includes shims in three critical thicknesses—0.015 inch, 0.030 inch, and 0.060 inch—to achieve precise spring installed heights on small-block and big-block engines. Valve spring shims are fundamental to proper valve train geometry, directly affecting valve seat pressure and overall engine reliability.
The 1.250-inch outer diameter specification matches OEM and aftermarket valve spring components commonly found in street performance, racing, and engine restoration applications. Steel construction ensures durability under cyclic loading and thermal cycling inherent to sustained engine operation. The three-thickness assortment allows builders to stack shims precisely and address spring height variations that occur due to manufacturing tolerances, machine-shop cylinder-head work, or cam timing adjustments. Correct installed height prevents over-compression or under-compression of the valve spring, both conditions that accelerate wear and compromise valve control at high RPM.
Engine builders performing top-end refreshes, carbureted street-machine builds, or vintage small-block restorations rely on valve spring shim kits to dial in correct geometry when original springs are reused or upgraded components are installed. The 16-piece count provides adequate assortment for single or multiple cylinder applications, making this kit a practical bench staple for professional rebuilders and serious enthusiasts tackling engine assembly in the home shop or performance shop environment.
COMP Cams has established long-standing credibility in the performance engine and valve train market, and this shim kit reflects the precision standard expected of the brand. Proper valve spring shimming is a non-negotiable step in any serious engine build; this kit provides the baseline selection needed to achieve it.
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