Valve Spring Shims 16pk 1.250 x .875 x .030

The Valve Spring Shims 16pk 1.250 x .875 x .030 from Howards Racing Components are precision spacers engineered for high-performance engine builds where valve spring pressure and installed height control are critical. These shims exist because factory valve springs often require adjustment during cam upgrades, head porting, or performance modifications—and getting the installed height exactly right directly impacts valve seat pressure, spring resonance, and overall cylinder head reliability. Whether you're building a naturally aspirated stroker, upgrading camshaft profiles, or fine-tuning a forced-induction setup, these shims let you dial in the exact preload your springs demand.

Each shim in this 16-pack measures 1.250 inches outer diameter by 0.875 inches inner diameter with a 0.030-inch thickness, making them ideal for small-block and mid-sized engine platforms common in street and race builds. The precision thickness allows incremental spring height adjustment without guesswork; stacking multiple shims lets you achieve the exact installed height specification your engine's valve train requires. Manufactured to tight tolerances by Howards Racing Components—a trusted name in valvetrain engineering—these shims resist deformation under sustained high-RPM load and maintain consistent spring seat pressure across thermal cycles. The 16-pack quantity provides flexibility for multi-cylinder adjustment or future engine work.

Performance enthusiasts, engine builders, and serious mechanics benefit most from keeping these shims on hand during cam installation, head gasket replacement, or valvetrain refresh. Proper installed height prevents valve float at peak RPM, reduces unwanted spring surge, and extends valve and seat life under aggressive driving or competition use. Before installation, verify your engine's spring seat dimension and consult your cam manufacturer's recommended installed height specification; shims stack easily under the spring to dial in the precise clearance your build demands.