If you have a 500 inch motor, I would highly reccomend a Wizard Cooling radiator. It will use a stock shroud. I would not use electric fans. I had dual Spals that could not keep my 512 cool. I would use the Wizard, stock shroud, Jag clutch fan and five blade fan. I just changed to this and am so happy I did. Have heard some not so good stuff on champion. Wizard quality is what I think we are all after. BTW I did 1.25 tubes. Do it once!! Mike

"Were in it to win it. Anything less will end up being..... A whole lot of fun doing!!" UNLAWFL
RIP UN