1" wide tubes restrict the flow of coolant less, allowing for a higher flow rate through the radiator. Wide tubes like that are usually used in high flow style cooling systems, and make the most sense in a single pass radiator.
I'm assuming the new Fluidyne radiator has 1/2" wide tubes, which will slow down the coolant flow rate through the radiator just a bit. That's the same reason the Pantera has a dual pass radiator. So the narrower tubes compliment the dual pass radiator design. I'd like to see the new core, I'm wondering if there's more space between the tubes, similar to the Hall Phoenix radiator, encouraging more air flow through the radiator, possibly making it more suitable for the OEM pusher fans.
-G
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