Manley valve spring shims are available in a wide variety of thicknesses. They are high-quality valve spring shims are heat-treated to resist wear.

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COMP Cams Valve Spring Shim, Steel, Hardened, 1.250 in. OD, .814 in. ID .030 in. Thick, Set of 16

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Sonnax Shim, GM, Th350, Th350C, 4L60, 4L60/70-E

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