Will this bore clean up, magnum head content too.

autoxcuda said

Wait… so a piston has been sliding over that nasty spot down in the bore?

… so that’s all “inny” corrosion? Not “outty” ?

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almost all is outty corrosion. I scraped it with a soft metal that was cut clean. Then more scotchbrite. Looks better but still really bad. The worst part is up at the top. You can see the bad corrosion.