The only way to be sure is to remove the valve springs and check the stem-to-guide clearance by trying to move the valve stem back and forth. If you can see any movement at all, that's too much- - - -pull the heads and find somebody who knows how to do a valve job the right way.
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!