[HawgRyder]

We used to do this type of "fix" on big bore Harleys.
It involved milling a slot sideways in the bore hole under the cylinder bolt hole and pushing in a piece of steel that had a threaded hole in it.
The piece looked like a half moon or a large woodruff key.
This would repair a pulled hole.
To simply brace the already threaded hole...the piece was not threaded prior to insertion...just drilled...then threade afterwards to continue the case thread.
Very touchy work...not sure there is as much meat in a porsche case as there is in a harley case.
Bob