Go to a selfservice junkyard and look at late model V8 cars. Cooling fans are sized for the heat load produced by the engine. A fan from a little 4 banger not even. Very few engines installed today have fans that move enough air to cool a 440 in a small frontal area car. We have a 440 Dart with a 26 inch radiator. A clutch fan 18" barely cools. I have tried several electric fans none of them would keep it cool. Good luck!
