Gary, I would agree with Chris. Depends on which option you are looking at utilizing. But personally, I would not put a sandblaster to an engine at all. The risk of driving grit into some hidden part where it could later jump up and bite me in the ass, would keep me up nights. I would only consider that option if there was a blasting company available locally that used dry ice pellets.
If it is a cosmetic redo of an intact engine, I would degrease, then paint stripper/wire wheel it, scrub wash clean and repaint.
David
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