I have a friend that had his radiator dual or triple passed. He said the nascar guys did this also. Does anyone know how to do this or how it works. I am asking about it on an aluminum radiator w/ 2-1" rows. I do know you have to have it heliarced but do you have to take the ends off to do it. That would seem like alot of work.

..some reading which kinda explains "how it works".
http://www.over-clock.co.uk/ivb/index.php?showtopic=14805

Anybody else have any info on this modification to a radiator?????