Sorry guys...try this again... That's a good point. Should I go with a copper 4-core or an aluminum 2 core. Classic industries for example shows US Radiator units. They have a 4-core copper and they are describing it as basically a "standard duty. My current unit has 3 coires so I'm sure going to a 4 will be an improvement. They also show a 2-core copper stating it's HD and for high horsepower applications. Does the aluminum transfer heat THAT much better than copper? I can get either for $372 delivered...but I gotta act fast before the discount code exipres. NEither description gives a fin count. Bill M 65 Coronet 500 'vert http://1962to1965mopar.ornocar.com/mmo62008.html 73 Dart Sport, 00 Cherokee Sport, 05 Ram 2500 CTD, 4WD, QC, LB, Laramie 21 Model T Depot Hack, 92 Accord, 06 Mazda 3 On Sat, May 7, 2011 at 12:15 AM, Dennis C. <dennis.2914@xxxxxxxxx> wrote: > > I'll second that, I had mine in the 383 rebuilt and it did not turn out > well. > > The new core had too low of a fin count. The number of tubes was > correct but the fin count was only around 10 per inch. I even tried a > shroud without any luck. Finally an old radiator guy showed me the > problem and told me in Yuma I would not be able to cool with my > radiator. > > That is when I bought a new one from US Radiator, 4 rows of tubes and > much tighter fin count - all is good now. > > Dennis C.