[jray1]

I have a 64 gto with a 68 400 in it. New build with a 30 over on the block. I added a Big aluminum radiator big electric puller fan. I have worked the divider plates on the water pump(cast impeller) to very tight tolerences along with directing the rear head outlet (to heater core) back to the passenger side water Crossover and my temp sender is in the driver side. I can't get this car to cool at all. I have flow thru the radiator and I have verified temps with a laser thermometer. The radiator is cool (130-160) and the motor keeps climbing till I hit about 250 and I shut it down. Please tell me there is something I am missing. Also the timing is perfect. Just installed a Holley 750 to make sure I had adequate fuel.