FromThanks for the ideas!
The common chamber is made up of a top and a bottom section. The top section has 6 bolts that fasten it to the bottom section. The bottom section (intake manifold) has 4 studs/nuts which attach the bottom section to the 2 heads (2 studs/nuts into each head). All the surrounding stuff is gone.
None of the 6 top section bolts have been removed yet. The 4 nuts attaching the bottom section to the heads have been removed. The bottom section (intake manifold) will not separate from the heads. I can clearly see the gasket all the way around but there is no separation happening yet.
I even went so far as to put a chain under the whole common chamber unit and lift up with the engine lift... the entire engine and engine stand lifted up off the ground but the unit did not separate from the heads.
I will try again later.