what kind of water pump did you use? some hi volume pumps will push the water way too fast thru the radiator,not giving the water enough time in it to be able to cool down. a cheap waterpump won't help your cause alot either. is the radiator cap brand new? a bad cap can effect the flow also with a loss of pressure. do you have a shroud? it helps to create a vortex behind the radiator that inturn helps air flow alot..
