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I replaced one of my cylinder block drain plugs with a 1/8 pencil zinc just for kicks this past spring. When I pull the boat and winterize, I'll pull the zinc and see what's happened to it and post back here. Probably a waste of effort since it hasn't had one for at least three decades. There is no shortage of corrosion inside the block, though. My raw water cooled engine has flakes of rust inside every time I open up the side access plate.
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