I'm not down on roller rockers. As Mr P Body said, if you are over .550 lift, a pallet tip rocker ( with it's large tip radius ) could be getting pretty close to the valve tip edge. I run roller rockers ( .615" lift ) for that exact reason. I'm sure some of the more high end roller rockers are more accurate ( regarding ratio ) also. Just saying that pallet tip rockers have their place, and are overly and unjustly "blacklisted".