There have been quite a few discussions about cooling issues. The last one just within the past few days. My 440 is a .030 over and will run warm in stop and go city driving after coming off the highway or thrashing it a little bit. I recently had it rebuilt. Previously it was basically a stock low compression motor with a modest cam. It acted the same way then too. The folks here on the list have tried many things like an extra electric fan or a fan shroud. Don recently suggested running a smaller pulley on the fan which will run the water pump and fan at a higher rpm. On that note Schuyler found his poly pulley and it is actually 1/4" larger than the one I currently have, 6.5" vs. 6.25" so I'm still looking.
Try drilling one or two 1/4" holes through the thermostat. Low buck, and it works.pigdoc
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