I finally fired up my project last week- TOO HOT ! I had to shut it down after the temp started rising past 210*F. The radiator is one of Bill Isley's (Wellbaum's) trick "T" units with an electric fan hidden inside between two cores. The engine is a Chevy 355 with some goodies (Comp Cams 274 advertised duration hydralic flat tappet, Holley 780 cfm 4160-3310 list- RPM Air Gap, yada yada yada). I was able to break in the cam by putting a bigass box fan in front of the rad. I'm running a 7lb. cap (any more and the top tank will bulge out- so I'm told). I'm also running a second 7lb. cap up at the high point of the system- a special water outlet with ports for senders and a Moroso air bleed (Jeg's). I know a new engine will run hot- but I don't want to cook it either. The pump is a Speedway "high volume" unit. Could it be overpowering the 7lb. cap?- It keeps puking out the upper overflow. I'm running straight water with water-wetter and a little EG coolant to start. Anybody running Evan's NPG+ coolant? THANKS !