Glad those heads are working great for you! Yes, I can see the difference between the two. But not very much difference when it comes to what they like to burn. I have the same problems with octane on both. And have to use the racing fuel on both. The lower temps on the one with the speed pro's does not seem to stop the detonation much. I think you are right on with the cam selection. I think it's helping you substantially. Definitely great info!
