I'm by no means an "engine builder" but do help my dad assemble the engines we run. We've used Mopar Performance, Comp and Lunati cams. We ran hydraulic for years and in the past 6-7 years have starting to switch to mechanical flat tappets. I only remember 1 issue with a cam and lifter going bad and that was an older cam that prob had 30 years of abuse on it.