Well, I took the plunge and pulled the valves on my 74 CB550.
Will measure them later tonight, need to borrow the calipers from Dad.
The intake look good, seating well, the exhaust valves on the other hand look like toast. 1, 2, and 3 seating, but not by much, number 4 had a spot where you could see the leak. I'm going to check with Honda tomorrow, thought some one else might know of some where else to pick them up.
James