Here’s some pics of a custom water pump pulley we machined out of a solid round piece of aluminum. The larger pulley was shipped to us to use as a pattern for machining the smaller diameter pulley. We made the new water pump pulley as small as possible in order to clear the housing of the water pump on the ID of the pulley. The smaller diameter pulley will speed the water pump up increasing the flow of coolant through the cooling system.
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