I talked with a radiator shop owner last week when I had mine in for some minor work. He was telling me about some newer technology where they are dimpling the tubes which leads to better cooling by breaking up the flow resulting much better cooling, particularly in high performance applications. The cores that he are using come out of Canada.

I can drop in next week to see if I can get some more info, if you like.

Jim Paget
88 YJ with a few changes

www.rrr4x4.com