[cadillac_al]

OK, found it and it was one of those. One of those valves was a little sticky in the bore so the pin was not under enough spring pressure and fell out. Yesterday I was tired and aggravated and it was getting dark. That's when it is best to quit for the day and try again in the morning when you are well rested and have brighter light. thanks.

Now I'll see if I can take the stickiness out of it and get it to slide in smoothly. It isn't dirt and it isn't a burr, it just seems to be very tight clearance.