Actually you made me think of something else, this this mill does run hot. by the time I have made 4 passes (in the heat of july and august) my rad is usually boiling. the only reason I ran the cam 4 degrees advanced is to make some more vacuum. I think I will put it back to 0 and see where my vac is at after the re-ring. I plan on adding a larger electric fan also to help my cooling issue. this sport is hard on engines and overheated trucks are normal. up untill last season this truck always placed, but last year I just seemed to run out of rpm in top gear. my engine used to pull to 5700 rpm right now. when I ran it on the week end before I tore it down all it could pull under load was 4200. that extra 1500 rpm is what is keeping me out of the winners circle. all I know is it is really embarassing getting beat by small block trucks. back to the topic of heat though, this engine seemed to run best when it was right on the verge of boiling. I guess that was do to better ring sealing at high temps. food for thought.