Onan 4000 Intake Manifold replacement

Gdetrailer- Thanks for your input, I didn't think to remove the cylinder head (and using the pipe extractor). I did a lot more digging and found the Cummings Service Manual with all the torque specs to retighten the cylinder head. If I can't easily get that small part of the bolt out or if it is cross threaded, I'll just remove the cylinder head and replace the intake manifold, probably be easier and quicker.

Thanks again for all the suggestions, this is a great source for info.