I just started the firbird for the first time in 17 years. I had the motor completely rebuilt, I even replaced all bolts. I put the motor together but,I had everything machined, resized, replaced new all down to the new four core radiator, seven blade fan and thermostat. My problem is "OVER HEATING". It ran for 15 min. and go to 230 deg. I didnt have the shroud on. The clutch fan came on at 220 deg. Tomorrow im going to run water over the radiator as its running and see what happens. Ill also time it. Im just venting.....Joe