Originally Posted by 96_4wdr
the upper intake plenum O ring gaskets are removable and replaceable
usually not included in lower intake manifold gasket set.
avail separately
FelPro pre 96
Plenum gasket MS94683
96 and 97
MS90733
Thanks for the replies and p/n's. It is the lower that is leaking, but I have removed the upper, and it does make sense that the rubber is replaceable (the oRings).
Once you get all the wiring and crap out of place, it isn't too bad to work on.