I've seen a new cam go down in the first 30 minutes of running if it's not broken in properly. Yes, it also cups out the bottom of the lifter, which lets the plunger top out and create the lifter noise. I've got a couple of Lunati cams lying around the junk heap with 15 good lobes, and one round one- - - - -with less than 100 laps on them around the Nashville Fairgrounds track! The lifters on those lobes were destroyed, too.
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!