I've installed the cam you sold me (Jim Wiser). I forgot to ask what dizzy gear I need, melonized, etc. I reread through the paperwork you sent to me and I didn't see it anywhere. In case you forgot, it is a retro hydro roller in a turbo'd TPI motor. I will say that the cam degree'd right on the money (inside .5 degree) for every event. I've never had one come out that close. Perhaps I'm honing my skills or the other cams were not this close.