I would agree with you. I have had several people tell me that I would need a shroud but I wanted to run it by the experts to confirm my assumption. Thanks for the great advise. I will probably try to go with a Griffin aluminum 2 core with 1 1/4" tubes. It is more expensive but the total capacity is closer to a 5 core if you look merely at the size of the cores in relation to the standard 1/2" core. I think that Walker has a similar style aluminum radiator. When I finally purchase and install I will let everyone know how it turns out. Again thanks for all the help.