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356KarmannSUPER,
The early sand-cast aluminum case is about 22lbs heavier that the early mag cases. Any good 911 machine shop will be set-up to convert these for competition use (add squirters, oil bypass mod, intermediate shaft bearing, etc.) I know several guys that swear by these cases, but they are hard to find. They are certainly more durable than a mag case.
JP
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