On mine, 571 cu in Pontiac I run a cold case aluminum radiator with a stock shroud with a large HD clutch fan, in Az. 100 deg. heat driving around town 40 to 50 stays 170 172, on the highway around 65 for a period of time 185 . I do run a 160 thermostat. I did try the (2) electric fan setup, did not work ran hot, hard to beat the stock shroud and clutch fan.
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