I do really appreciate the information. I've never been given any data on them, other than the expense. I've heard the argument about harmonics, but if that was a big concern the gear drive would be a disaster. I don't believe that we cheated out on any of the parts with this build, it has titanium valves and t&d rocker gear. Another concern with the belt, as this will be a driven car, how dirt and grime will affect belt wear.