Out of stock
SKU: DUR1070
MPN: 1070
The Valve Spring Shims 1.247 OD/.877 ID/.015 by DURA-BOND are precision steel spacers engineered for engine builders, mechanics, and performance enthusiasts who need to adjust valve spring pressure and installed height. These shims solve a critical challenge in engine assembly: when stock valve springs don't deliver the exact preload or height your application demands, these ultra-precise shims bridge the gap without compromising reliability. Available in a convenient set of 100 units, they're the go-to solution for both stock engine rebuilds and high-performance modifications.
Manufactured from hardened steel, the Valve Spring Shims 1.247 OD/.877 ID/.015 feature a precisely controlled 0.015-inch thickness that allows for fine-tuned spring rate adjustments without introducing deflection or binding. The 1.247-inch outer diameter and 0.877-inch inner diameter are engineered to fit directly under valve spring assemblies on most common automotive and small-block engines. Their flat, uniform construction ensures even load distribution across the spring base, preventing uneven wear and maintaining consistent valve timing geometry. The 0.32 lbs weight per shim set reflects their compact, high-density construction—critical for applications where minimal mass is essential but maximum durability is non-negotiable.
These shims are ideal for engine builders fine-tuning spring pressure in naturally aspirated and boosted engines, mechanics performing top-end rebuilds, and restorers returning vintage engines to original specifications. They work seamlessly with aftermarket valve spring kits and OEM assemblies alike. Installation is straightforward: stack shims under the spring retainer seat to achieve the exact installed height and preload your engine requires. A single shim adjusts height by 0.015 inches, so buying a full set of 100 eliminates multiple orders and ensures you have options for every cylinder and application. Whether you're building a street engine, race motor, or restoring a classic, these DURA-BOND shims deliver the precision and reliability professionals trust.
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