I had the same problem after my motor was rebuilt. My engine builder took the motor back out and tore it down. Found nothing wrong put a second HG in it just to have the same problem within twenty miles. He then brought in a guy who is known for some very fast imports. He said due to the extra HP the motor produced more heat than the radiator could handle. We did a larger radiator and dual electric fans. I have not had a problem since temp does not go over 180.
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