Not Ranked
Might be easier to pull it off, and repinch the tangs and test at radiator shop. Less down time too. Happens sometimes on radiators with plastic tanks, the "O" ring that seals the tank to the header is not compressed enough by the tangs that capture the tank. Not a big operation.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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