Just re-torque the bolts? Here is link that shows the condition of my gaskets. Now you really have me wondering if maybe it could be possible that inadequate squeeze on the gaskets could have started the whole process of deterioration. Hmmm,,, maybe. However, as you can see from the picture how bad my gaskets were, they were definitely way beyond just re-torqueing.
As for me, whenever I have a Series II down for plenum replacement, I'm DARN SURE going to go that easy next step further, and replace the lower gaskets as well.
-then, maybe re-checking the torque a few months down the road would be a good idea?? Heck, I don't know. I do know that you can't get to all the bolts on the manifold, without having the plenum off, and I'd be a little spooked about tightening some, and not the others. (-I think that would really be inviting trouble)