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I'd be very careful about using steel wool or media blasting my case. There are lots of oil passages that could harbor bits of steel wool or media beeds and that could ruin your new engine.
I just clean the outside in a parts washer and try to keep dirt from going in any of the passages. Then spray out the oil passages with brake cleaner or carb cleaner.
-Andy
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72 Carrera RS replica, Spec 911 racer
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