Quote:
Originally Posted by 87chevy.com
In can say with experience, you may overheat if you have a smaller radiator and the heater core lines are blocked. In my bmw 5 series LS swap, the heater core lines go to the factory heater valve. Maybe the same as vintage air system, ac on, no need for hot water to flow inside the ac box, and its closed. Ive seen the coolant temp rise above 220-230 before I realized what's going on (automerer gauge) That's at the water drilled and tapped next outlet by the tensioner. The temp sender in the head goes higher. As soon as the heater valve is opened, coolant temp goes down and back to normal. Before I thought the radiator was too small, stock. It wasn't the road, it was the design of the heater core flow. Also have the 160* stat
Clint
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Sounds to me like your main problem is the too small of radiator matched with a 160* thermostat. It's been my experience that putting too cool of a thermostat in actually does the opposite of what you would think by not letting the coolant to spend a sufficient amount of time in the radiator therefore causing it to actually run hotter.