Cold Case

By 'largest' I mean the tubes. Ours have Dual 1 1/4". that's more volume than other aluminum cores including dual 1", 4 tube, 3 tube and of course small 2 tube. These are all the other core sizes available in aluminum. There are 1.5" tubes for commercial applications but they would not be well suited for our cars.
thanks , i was wondering about the tube size. I have been running an alum rad w/ 1 1/4 tubes for about 9 yrs ------bob