Hi all.
Red, the 94 continues to be problematic at every opportunity. The exhaust Y-pipe developed a crack where the two join. Then the O2 sensor would not come out. Grrr. I got new pipe, sensor and seals and installed. Car was still loud so I got new lock nuts and compared to Rogers pipe. I decided that I didn't tighten hard enough against the manifold and proceeded to snap off a manifold to Y-pipe stud trying to remove the nuts to replace with the new- even though I JUST had them off and then on with no problem either way. So I removed the manifold with no problem, not even the egr tube.
Finally! the Question: What is the thread pitch of the manifold side of the stud? And, Its not left hand thread is it? the Y-pipe side is 3/8-24, and I think it is probably the same, but it Does say Jaguar on it, so who knows....

 

I can tell you're all waiting with bated breath. The manifold side of the stud is 3/8- 16 thread. I got a replacement stud from my local Ace Hardware store. What a place! The car is back together and not much worse for wear.