Several years ago I had to bead blast a crankcase to remove the external corrosion that could not be chemically removed. I protected all the oil passages - something I'm sure your local machine shop didn't do. In any event, I found a shop in California that was able to ultrasonically clean the crankcase for me. I would recommend that you consider doing the same - have the case ultrasonically cleaned. In addition, if they blasted the mating surfaces (almost a sure bet - as an appretice usually does the cleaning, you will need to have the case lapped and alignbored. Make sure the shop has boring, not honing equipment. Hope this helps. If you can't find a local company that has a big enough ultrasonic cleaner, let me know and I'll look up the address I sent my case off to. As I recall, it was the only shop on the west coase I could located. Fred
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