This shift is more left and right. The lobe grinds look good. All lifters rotated in the bores. I'm almost thinking I could grind down that seam to get it to work lol.On a flat tappet cam the lobes are tapered and the lifters are wider than the lobe. If the core shift is bad enough the lifter will jump or drop everytime it is rotated and crosses the place were the core shift is. I have seen the lifter drop .002” whenever it crosses the seem on a cam that had terrible core shift. I sent it back, the cam was junk.