I'm not sure if there's a powdercoat out there that can withstand the constant heat of an engine. If there is, that would be the way to go, but of course, you'd have to completely disassemble the engine, down to the empty cases to have it done. There would be alot of cleaning afterwards due to the media used to clean off the old finish. That stuff would be in every orafice. All bearing, threads, & gasket surfaces would need to be blocked off so theres no powdercoat buildup in those areas, etc etc.
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