I mostly worried about my cam during the break in process. My engine builder said he is going to install some weaker springs for me to use during the first half hour of run time. Then install the recommended ones. I have never changed valve springs before but I have an idea of how to do it and some buddies that done it before. The engine builder said I don't really have to go that route but he recomends it. the cam is a 268xe. Have you guys ever had to do it this way. I was reading a article on compcams.com they said just to use a good oil like Rotella. Could someone just explain how this cam gets broke in. Does it just get harder as it breaks in or what. Thanks