I found this video on the Peter Morgan 911 channel:
YouTube - petermorgan911's Channel
There the engine builder Nick Fulljames talks about the mag crankcases.
He says most of the times a line hone back to standard is required and machining the spigot surface is always required. This is in England, which is not known for its hot climate 
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Magnus
911 Silver Targa -77, 3.2 -84 with custom ITBs and EFI.
911T Coupe -69, 3.6, G50, "RSR", track day.
924 -79 Rat Rod EFI/Turbo 375whp@1.85bar.
931 -79 under total restoration.
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