Philippe,
As you are new to this thread, I find myself wondering what, if any, problems you might be having with your cooling system?
I would venture to say that most Panteras are using the stock plumbing/piping/two-tank system but with upgraded sucker fans and radiator.
Yes, you can greatly modify the piping system to be "better" and wind up with only one tank.
Yes, you can run a smaller water pump pulley to "increase" flow.
There are a LOT of things you CAN do to the cooling system.
But does your Pantera have any current cooling problems, and if so, what are they?
Larry
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