Ok,I'm gettin ready to put a rad in my truck with 446K,on the original one. It doesn't leak yet,but the inside has severe corrosion at the fins. I can't believe it can still flow water. I didn't put all the miles on so who knows if it had seen regular coolant changes. My question is,while shopping for rads on-line,i noticed they are selling the same rad part # for my cummins that fits the 360 v-8? How can this be? Is it true? I don't want a rad that is equal or worse to my plugged up one. Anyone know where i can get a reasonably priced one that has aluminum tanks so i can be rid of the plastic? I'd prefer a all aluminum one since it transfers heat better. Thanks for any advice. 
