Several years ago I took a three core (I have also done it with two core) rad and tried an experiment. I had double 1 inch tubes installed instead of a two or three row core. It was marvelous! It held 3/4 of a gallon more coolant, looked original, and stood up to every heat laden punishment style of driving that I did. Slow traffic, long idle periods, trailer towing and family cruising. It is important to measure carefully that the tanks will accept such a wide set of tubes, and that the shop can do it. Some would poo poo the concept,...but let me tell you that it never let me down and was still going strong years afterwards. Good luck!