One of the wise old sayings I picked up from a race engine builder- - - -"Oil is cheaper than engine parts!" If it uses a little oil between changes, at least things are getting lubricated. A too-tight valve guide is going to overheat and start galling things long before it has a chance to "wear-in".
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!