You'd better explain "lapping", Evan- - - - -some of these young sprouts have never heard that term! I've still got a few tins of Clover compound, but I've been using Prussian Blue to check seat width instead of lapping valves for the past 20 years or so. Try filling a combustion chamber with alcohol sometime and see which valves leak- - - -the lapped ones don't seal as well as ones with the ground finish only. Another slick trick is to use vacuum on the intake and exhaust ports to check for a good valve/seat seal.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!