Paint is an insulator and depending on how thick you put it on will act just like all the grass and dirt clogging the fins. Radiators are a bad comparison because they are supposed to get hot and rarely get past 200 degrees which is why the contractor said you can paint with anything on hand. Your trying to keep your engine cool not see how hot you can get it before it fails...
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1977 1650 with cast iron lower grill housing, cast iron oil pan, 54" push-snow blade, rear blade, disc-harrow, 44c and 48" decks, Two cultivators, #1 tiller with both extensions, loaded tires, 75' weights and chains, #2 cart.
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