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Re: 250 inline running hot at highway speed
I believe there is a "dwell" time to the inline 6 where water flow is concerned. I might be wrong but the Stovebolt guys say that the water needs to stay in the 250 head long enough to pick up heat. Due to the length of the head and the way the passages actually flow water when a thermostat is out the water is in and out of the block but the cylinder head doesn't see the flow rates back at number 6 cylinder. Can't confirm it though.
If it was mine I would start with pulling the water pump. Cool thing is you can see the #1 cylinder bore and the internal passages very well.. If it looks like a chia-pet growing in the water galleries you have found your problem. Flush the radiator and block, throw on a new water pump for giggles and see what happens. The stock 2 core is easily up to cooling the inline 6.
Paul
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