Originally Posted by 57chevythunder
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)
My lower gaskets were even worse than that!! I think it might have to do with the fact that my wife only drives one mile to work; causing the car to constantly get started and shut off. The gaskets (and all material for that matter) expands and contracts more frequently with the short trips. Given that your mileage is so slow, I am assuming you do a lot of short-trip driving. Even if your gaskets aren't as bad as the ones pictured, changing them will give you piece of mind and let you go another 75K worry free.