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

The 1.480 O.D. Spring Shim Kit by COMP CAMS is an essential precision component for fine-tuning valve spring pressure in high-performance engine builds. This kit contains 16 individual shims in three thickness options (.015", .030", and .060") that allow you to dial in exact spring rates without replacing entire assemblies. Whether you're building a street performance engine, preparing for track duty, or dialing in a fresh cam installation, these shims give you the control needed to achieve optimal valve control and prevent coil bind.

Spring shims work by adjusting the pre-load on your valve springs, which directly affects spring pressure at both closed and open positions. By stacking shims of different thicknesses, you can add or subtract lift incrementally—typically 5 to 10 pounds per .015" shim—without the cost and labor of swapping entire spring assemblies. COMP CAMS shims are manufactured to tight tolerances and are compatible with standard 1.480 O.D. spring seats found on most small-block and big-block engines. The variety pack approach lets you experiment and confirm the exact stack height needed for your specific cam profile, valvetrain geometry, and performance goals.

This kit is ideal for engine builders, performance enthusiasts, and mechanics who need flexibility during cam installation or spring upgrades. Proper spring pressure is critical when running aggressive cam profiles—too little pressure causes valve float and loss of power; too much creates excessive wear and complexity. The 1.480 O.D. Spring Shim Kit works with most conventional American V8s and small-displacement performance engines that use this industry-standard spring seat diameter. Installation is straightforward: simply stack shims on the spring seat before reassembly and verify your final spring pressure with a spring checker tool to ensure peak performance and durability.