I've got Crower solid rollers, with no 'cutouts' and depending on which block i stick them in, may or may not expose the oil gallery at the roller wheel. A big roller cam gets big by making its lobes' base circle small, not the lobe sticking 'up'. Small and Big roller cams keep the lifter in the same approximate location in the lifter bore at max lift. Thats why you need longer pushrods with no other changes, for a 'big', high lift roller cam. Cause the lifter sits lower in the hole with a big cam. I'd just bush it.