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I purchased a new cast iron rotor type pump a few years ago. It had a casting flaw in the cap so needed to be replaced. At that time I searched for an aluminum unit without luck. If they are made I would like to have one.
Sorry but no help. The pump came from a machine shop that put together my motor back in the midwest. I dont know who supplied it to them, and the shop is no longer around. Tried to find them this last winter while in KS.
I checked the NAPA site. Looking at their picture, they sell a gear type oil pump, and a repair kit for a rotor type oil pump. A complete gerorotor pump is not shown.