Here's the original Harrison heater core from the car. Date 70J. I think I'll take it to the radiator shop and have it checked out and pressure tested. I have an NOS core, too. Would you trust a 46 year old core if it tested OK?
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IMHO, since Harrison cores & radiators were not the best quality from day one, no, I wouldn't trust it. But I'm thinking the NOS one still might be better than the majority of Chinese ones that the parts stores sell.
