The difference between B303, E303, F303, X303, Z303 and whatever other letter prefix cam there is? I am sure it has something to do with lift and duration but can someone put an order to it from mildest to wildest and let me know what other prefix is in the mix? I did find on the ford racing website that the F is good for superchargers and the X and Z are good for high revs. Which ones idle better than the others, etc.?