Thank you all for the replies.
The damage on the lifter is on the opening side of the ramp just before the top. The lifter bores where bushed for flat tappet solid lifers that measured .904"and these BAM lifters measure .903", so the clearance is about .0028" atm with the BAM's.
Spring pressure are 255 lbs on seat and 560lbs over the nose.
Cam specs are 255/262 deg @ .050", 112 lobe sep, lobe lift .399'intake .409'exhaust with 1.5 rockers.
All intake lobes have same wear pattern , runs on one side lobe , runs flat across the top then runs on the opposite side of the lobe going down. its as if its trying to turn twist the lifter.
This has me stumped