Here’s some pics of a custom pulley we machined for a big block Chevy. Most of the custom pulley machining we do is done out of a solid piece of billet aluminum round stock. This pulley is machined to a smaller diameter than what is available off the shelf from the normal suppliers. The smaller diameter water pump pulley increases the rpm of the water pump which increases the flow of coolant in the cooling system which is helpful in some hard-to-cool applications.
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