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Indirect injection diesels have large radiators because of the massive heat loss in the idi cylinder head, so you most likely have a cooling fan or thermostat problem. Make sure you don't have air in the cooling system, especially if the engine sits higher than the original.

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Q: 83 Monte that had a 4.3 diesel that I replaced with a 350 and now it is overheating I am running the radiator from the diesel do you think that is my problem?
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