A thermo gun should be your best tool. Check temp differences between the inlet and outlet and if ok you can eliminate the cooling side of the system and concentrate on the engine. Check for temp fluctuations between the front and rear of each head as this may locate spikes to determine a problem. If the temp is the same through out I would focus around the bypass section and that the donut and proper thermostat is correct, there is a special thermostat for a cleveland and I think that has been mentioned. Also just a guess and not sure how this will effect just make sure that the rad hoses flow the coolant through the rad in the proper direction as I think the coolant flows from the bottom of the rad to the top, someone correct me If I am wrong. JMO, Derrick
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