BTW...just get a new pump from GM. Find the PN for an LS6 oil pump. All the new ones should be the same....but just use the LS6 oil pimp PN as a reference to ensure you dont get some old 98 oil pump that was sitting on a shelf. You can get a stock ported oil pump for fairly cheap from several vendors.
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if it's cheap & reliable, it ain't fast, if it's fast & cheap, it ain't reliable, if it's fast & reliable, it ain't cheap