skperf - on my '92 LS-400, I didnt have to remove the head, just the intake manifold. Why would one have to remove the head, seems odd to me ?
LS400er - the tube he replaced bolts on to the back of the air intake chamber. I dont believe that is the source of the problem. I agree with sk, there is some kind of blockage or the missed puttting a line back on.
That is alot of work to replace starter & EGR tube.
If you dont mind, how much did that set you back ??
Jeff