Small Block Oiling System Mods

well, it's up to you and your builder. For anything other than a roller cam, I wouldnt bother. Really, 6500 isnt that high, and unless it's being raced SCCA style or similar, you shouldnt have issues. A solid body lifter has no cuts in the bottom to allow pressure to bleed off if the oil passeg uncovered. A street engine needs good drainback, and a decent windage control setup, and that should be fine. Tubing came about when race engines were reaching high rpms and high lifts and the rods were being starved.