Is this happening on your project car? If so, the "what to do" is simply to put up with it. Those lifters were a very primitive design, and I don't think any upgrades are available. Maybe, "somewhere over the rainbow", there might be some new old stock parts, but brand new ones might have the same problem.
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!