I have a high power 454 motor with a conventional fan and brass heatsink. I use a Stant 180 degree SuperStat with all Chevy engines. On the 454, we ran the engine at 3000 rpm for over 20 minutes during the initial engine break-in, and it wasn't close to overheating. I drilled two small 1/16" holes in the thermostat housing to vent any air that got into the system. I'm not sure if this is an old story, but it didn't seem to hurt! Even with my rudimentary cooling system, my car never overheated.
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