What I do with the new valves is just do a light lap and check the contact area, it will make a white/light gray line on the face of the valve, it should be in the middle 1/3rd to be good, if its any bigger than 1/3rd or not centered than you will most likely have to get the seats cut. Most all my experience is with the small displacement hondas, almost never have to even dress the seats on those motors, just throw a new valve in there, light lap ... good to go. Some pubs say dont lap, bad info. I take a dewalt, and put a fuel line over the stem, then chuck the valve. but go EZ!
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