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What is the temp as it boils over? Do you have an infra red thermometer? What is the temp at the surge tank? At the water pump?
What are you using to recirculate coolant?
I ask because my 427 would seemingly boil over at 185 degrees with a 160 thermostat. Actually what I found was happening was that the engine was pushing out a fair amount of coolant as it reached operation temp. I have no idea why. But what I discovered was that my old recirculation tank was just a catch can. When the coolant was pushed out it wasn't ever returned. Over a span of a few hours it expelled enough coolant to make it run hot.
I installed a new coolant recirculation tank (see my gallery) and now it still moves coolant to the tank, but it also puts it back.
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michael
A man that is young in years, may be old in hours, if he have lost no time. But that happeneth rarely. Generally, youth is like the first cogitations, not so wise as the second. For there is a youth in thoughts, as well as in ages... Sir Francis Bacon (1561-1626)
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