I may be wrong here, I'm certainly no Ray Barton, but the roller cam bearings in those blocks are for friction reduction due to insane spring pressures (and larger cam cores) moreso than oiling. Taking oil away from the lifters where it isn't really needed is more beneficial in your case than having roller bearings.
Yes exactly....For me, its a volume issue. I have been killing #7 & #8 bearings for years when they starve for oil....Wondering what other folks due differently. Obviously, an accumulator might be in order as well. So roller cam bearings and maybe sleeved lifter bores sounds like what I have been missing.
