Agreed, 230 is too high. However I do knoe that a thermostat is required in most closed cooling systems. The thermostat slows down the water flow to allo time for the water to cool. Check your timing, like we discussed on the phone, first. I know you have an electric fan, does it have a shroud? Is the radiator rated for a 8 cyl motor? Water pump, what kind are you using?