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I used stock GM pulleys on my motor, but the water pump pulley ever so slightly fouled on the body of the Edelbrock water pump. Speedway Motors sell these pulley shims to provide correct alignment. I only had to use one 1/16-inch shim, though the kit contains two 1/16- and one 1/8-inch shims. On the left is a crankshaft pulley spacer to match the upper pulley's alignment.