Aluminum single groove upper Small Block Chevy pulleys for 1955-1968 short pumps.
It may be necessary to shim either or both of the pulleys to achieve perfect belt alignment. There are variances between manufacturers of both water pumps and pulleys.
From inside at fan hub to back side of pulley is 2-3/4"
From back edge of pulley to center of V-belt groove is 5/16"
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