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smallblock chevys usually use studs for water pump pulley. the thread size is 5/16" dia. nf (national fine thread) on the water pump flange side and 5/16" course thread on the pulley side of stud. if you use bolts you will need 5/16"NF x 3/4" long.

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Q: Size of bolts on a Chevy water pump pulley?
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