This is interesting. Clamping force will be increased with more studs or bigger diameter studs, but sealing is a different issue although they will be related. If the studs are deep into the block (like lsx) shouldn't they be ok? Is there some way to calculate clamping loads, force times area or something like that?
Tuff, I had a propbem porsche turbo engine a while back. Gasket pushed sideways .020", broken fire ring and rings etc. No carbon leaks on gasket so I guessed it was instantaneous. The studs weren't stretched either. If you get head lift can you tell from carbon leaks? I guess you could but I've never had it happen.