Shim (Spring / Booster), HT Steel, 1.125" OD X 0.265" ID X 0.060" H, Harley-Davidson, Flathead, 1930-1973

Setting the correct installed valve spring height and pressure is critical, the proper operation of the valvetrain.
KPMI offers a large selection of valve spring shims to allow the builder to compensate, changes that may have occurred due to machining or custom parts usage.