Valve Spring Shims 1.270 OD/.570 ID/.015

Valve spring shims 1.270 OD/.570 ID/.015 from Dura-Bond are essential components for any serious engine builder or performance mechanic working on high-RPM applications. These precision shims sit between your valve spring and its seat, maintaining correct spring pressure and preload as your engine ages or after performance modifications. Whether you're rebuilding a stock engine or dialing in a custom cam setup, proper shim selection directly impacts valve train stability, engine longevity, and overall performance consistency.

The 1.270-inch outer diameter and .570-inch inner diameter dimensions are engineered to fit specific valve spring configurations found in common performance and street engines. The .015-inch thickness specification works in combination with other shims to achieve the exact spring pressure your application demands—typically ranging from 60–80 pounds closed and 180–220 pounds open, depending on your cam profile and intended RPM ceiling. Dura-Bond's shims are precision-manufactured to eliminate micro-variations that can cause uneven spring seating, valve float, and premature wear on rocker arms or cam lobes. Quality shiming is the difference between a valve train that holds together reliably at 7,500 RPM and one that grenades at 6,000.

These shims are ideal for small-block and big-block engine rebuilds, particularly when upgrading camshaft profiles or addressing valve spring pressure deficiencies on carbureted and fuel-injected platforms. During a complete valve train overhaul, always measure spring pressure at installed height to determine your shim stack—a 0.025-inch difference in total shim thickness can shift pressure by 10–15 pounds, which is critical for cam compatibility. Installation requires basic mechanical knowledge: remove the valve spring compressor, measure the gap between spring seat and installed height, and stack shims accordingly. TacticalSurplusUSA's inventory of Dura-Bond shims in multiple thicknesses ensures you'll find the exact combination needed for your specifications.