I would like to get away from my current fan. How many cfm is enough. I'm afraid the one I do have is probably only "good enough" to be used as an auxiliary. I don't remember the number, but it was something like 1200 cfm. I think for the sake of getting the engine back up and running, I'm going to install my old fan. I think I'll put this current fan on in pusher mode, partly to make sure that I don't overheat during the 20 min cam break-in period.