Well, I don't have a feeler gauge small enough yet, but there is definitely more room on the exhaust valves on the first cylinder than on the fourth cylinder. With my thumb, the fourth cylinder is almost difficult to cover (or maybe I'm just timid), but the cylinders 1 and 3 I can seal with my thumb. There's definitely a compression problem of some kind.
Is there any problem with using "used" valve shims? I have my old head and the new one came with it's own valve shims and lifter buckets. I figure with the ones I have I should be able to swap them all around to meet the necessary clearances if I can reuse the old ones. I need to get a better feeler gauge and measure the shims first, though.
Another question - the rubber plugs on the ends of the head have to be glued into the head. What is a good adhesive to use for this? I don't think the one I used is going to work (glad I noticed now and not on the road). Don't remember exactly what it was I used....