Pat, I'm not trying to deny your experience. If you're an engine builder by profession, then you clearly have one over on me when it comes to seeing how an engine wears. Are you saying that on those engines with excessive cam wear, that there wasn't already some other reason to tear it down or rebuild it? I'm thinking in most cases it's already time to freshen it up, but I could be wrong. I'm just saying that for me, personally, I don't see the benefit of rollers if I'm not running steep ramps and high spring pressures. What's the cost-benefit analysis of buying roller tappets vs. buying additives anyway?