Comp cam

If you have an issue with a flat tappet cam, 99% of the time you will find the cam lobe centered in the lifter bore , the lifter won't [spin to lube] i learned this by building many engines in my shop [71-80's ]
plus many years working in dealers- [chev-chry] .
i solved a lot of issues before they started plus ran 5-30 -5-20 oil, prior to this no heavier than 20 wt.