'67 GTO with 400 YS engine, A/C car with auto and 3:36 posi rear, with Desert Cooler 4-core radiator, factory shroud and clutch fan. I run a 180 thermostat, car will stay between 185 - 190 around town but on extended highway drives on a hot day with hills, temp will get up around 210 on a Stewart Warner mechanical gauge. I would not in any way say that I have "optimized" for cooling efficiency.
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