It may not be big enough, being a single core. A large two core in the same dimensions might do the trick. Yes, pulley size makes a big difference, I could not completely eliminate the cooling issues on my 403 till I chucked the underdrive pulleys. Only when towing would it over heat, the 3 core Champion rad wasn't big enough, also tried a single core aluminum plastic rad, same thing. Cars with A/C usually have much larger pulleys and an enclosed impellar in the water pump. Both help with extra cooling needed. It could be the water pump but it could just need a larger rad. Make sure all the air dams are intact as well.the radiator is one of those plastic tank aluminum Core Replacements it was in the truck when I got it it seems to be fairly new and in good shape
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