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COMP Cams Spring Shims .030 X 1.640 - cca4746-16 import_2022_03_21_012537 -cc Nerf Bars & Running*Valve Spring Shims and Kits* * Equalize installed height of valve spring * Engineered from the highest quality shim stock * Heat treated to withstand radical camshaft lobes * Available in three different thicknesses to help achieve proper valve spring height * Shim kits contain (16) pieces of each thickness listed *Big Block Chevrolet Seat Spacers* Late model Big Block Chevrolet engines are originally equipped with exhaust valve rotators. Until now,