1999 Boxster 2.5 with PULLED head studs

[Dick Shift]

I have 1999 Boxster 2.5 with pulled, yes I said PULLED head studs. Sounds like a 1974-77 911 with the air cooled 2.7!
Head bolt threads are in a @ 8" deep hole in the case. To deep to install case savers? Anyone herd of this one and possible fix? Other then replacing the case.
Mahalo and Aloha, DS

[Dick Shift]

Warning; the engine pulled some of the head studs do to the factory head torque to much for the aluminum treads in the crankshaft bearing housing.
The fix; Case savers. same as used on the air cooled 2.7's head studs. Note pictures.

[Dick Shift]

Boxster engine advice needed.
Goal to build one good engine out of three 2.5 Boxster engines I have. Two had a cly. sleeve move down toward the crank. All IMS bearings good BTW. OK questions:
1. Prepping the one good block for new rings. Looks like air cooled Alusyls cly coating? Conventional honing? OR Use Scotch Brite pads buy hand, as we do w/Alusyls.
2. Was my pulling head studs out of bearing carrier, when torquing down heads in my first 2.5 head gasket replacement common? See above. Wondering if I need to go threw all the trouble of Time Serts? Never herd of anyone else having that happen to them. Factory head torque specks to high?? maybe? Sure seem like it to me.