Just to clarify the question in my last post: I have tried the gravity/inertia method to separate them (ie. rag on the floor, tapping the housing on stacked 2x4s to get the alternator to drop out
http://forums.pelicanparts.com/porsche-911-technical-forum/524908-fan-removal-help-engine-mystery.html ), I have tapped with a soft hammer, basically anything that I thought wouldn't destroy either the housing or the alternator. Should I try to heat up the housing with a torch like I did to remove the nuts from the exhaust studs, or will that not work with the magnesium like it does with steel? Another thought I had was to take a sheet of plywood or piece of steel large enough to cover the face of the housing, drill a hole in the middle of it for the pulley shaft, and then tighten down the nut on the shaft to use its force to pull the alternator out. Anyway, I know there are many pelicans out there with a great deal more knowledge and know-how than I possess, so I humbly extend my request for your wisdom.
Thanks,
Alex