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Why do you think the cases are scrap if they have been vapour blasted?
Ive been thinking about this process. Is it feasible to build the whole motor up as a shell with no "inards", blank all ports and openings off. Then process as a whole? Obvioulsy careful cleaning there after but I would imagine the liklihood of media in oil ways lessened.I am sure I will be shot down by you clever people out there but seems to make sense to me....