04-20-2011, 08:58 AM
Clay is studying heat transfer, maybe he can pipe in here. I wll say that alum is cheaper and lighter- probably the reason it is used so much now. I think that you should be ok with your new rad. Just have a good shroud on it. I have an alum Howe in the crawler w/the 351. It gets hot sometimes, but I don't have a shroud on it. It usually does fine, and it is always slow speed stuff.