Quote:
Originally Posted by edhd58
dont want to steal this thread, but maybe I need to have my radiator looked at. car does same as his, fine at lower speeds but anything above 55 and it wants to run 200+ degrees. at 65 mph its 215 and up on a 90+ degree day. block is freshly baked at the machine shop, and rebuilt water pump, radiator is supposed to be NOS, but who knows for sure.
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Sounds like the radiator may be the culprit, but before you do something really expensive about that, be sure the timing is as advanced as you can get without pinging, and that you are not running too lean. Those were the things that helped a little with overheating at high speed. Also, you might make a test run with the thermostats pulled out. That also helped a little.