[Bob Ashlock]

Thanks for the input Steve, I understand the comment about hidden dirt. I had even considered removing the lead plugs to give clear access to all the passages, just to make sure nothing is hiding in there. I was reluctant to do that considering I didn't have any lead to put back in (although I suppose I could use JB Weld). I hesitated because it seemed like the passages are clear based on my observations when spraying carb cleaner and compressed air through them. None the less, the condition is definitely lean on that cylinder and there must either be air getting in somewhere, or not enough fuel is getting sucked through the fuel feed passageway to the idle jet. This is just one of these deals where I will have to continue playing with it until I have the "ah-hah" moment.

More info: When I observe the behavior of the little indicator on the uni-sync, even though it rises to the same basic level as the other cylinders, on this problem cylinder it seems to bounce up and down a bit more than the others... as if there is more reversion, or some kind of manifold leak. I already installed fresh manifold and carb base gaskets and made sure everything fit flat and nice. I would even suspect a valve leak, except I just ran the compression again yesterday and saw good numbers on that cylinder, although it was the lowest (145) versus 150 for the others.