radiator. what should i shop for?

I would say get on Ebay and look there. They have some that will cool 400 HP. I will most likely get mine there. My engine builder recomended I get a 4 row to cool 500 HP. Remember though if you go from a 2 row to a 4 row or whatever make sure it will not hit fan. I know a few people that have got the Champions and not had any problems. also you want a cross flow I believe. You might wanna see what s senior members says also, they could probly give you a better idea.