IIRC, the 2nd from the bottom for sure goes into the cooling jacket. That is the spot, where if a too-long bolt is installed, it proceeds into contact with the #1 cylinder wall and cracks it.
Good to know. Hopefully that is not the case or my block is now scrap...
I do recall it tightening up the PS mount just fine and not feeling like I had to overcome some friction to get it tight. But it probably doesn't take much to puncture cast iron.