Well, the funny thing is that what I measure seems to change. When I put the clips on the shafts that hold the opening rocker in place, the measurement changes. The clearance seemed to change if I rotated the opening shim too. I don't know why though. What you say is logically correct, but after I lapped them and put everything back together, the clearances seemed ok enough for compression testing. Thanks for your help.It is far easier to adjust the valves with the head off than on. Openers .004" closers .0015" If you have lapped the valves in the openers will be tighter and the closers looser.You said the openers were only .002" before you took it apart so the clearance is now less than that.