Radiator issue

Many times the aluminum will become brittle if the radiator has been overheated a few times in the past. Look for some white chalking around the tank pinch seams and where the fins are soldered to the upper and lower support, a sure sign that it has been overheated in the past. Or it could be just a bargain basement recore that used thinner fins. Either way, I would use the best of the 2 for now and rebuild the correct one for later. Good luck with your project, Geof