"Deflectors"- - - - - -the thin sheet metal rings about 1/2" tall that are sandwiched between the top of the valve spring and the spring retainer on some engines. They work with the O ring at the top of the valve stem under the split locks to keep oil from puddling on top of the valve guide. If a positive seal that clamps on top of the guide is used in addition to the O ring and the deflector, the guide will be starved for lubrication and it will wear out quickly.
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!