Hmm... reducing fitting sounds like it would produce a good amount of backpressure. Anyone using such a setup have any problems with it?
Also, think about this. Here's the order of your system:
pump -> waterblock -> radiator -> pump
If you had wider tubing between the waterblock and radiator, and even the pump and radiator, wouldn't that slow down the flow of water and improve cooling? I guess it would require either a reducing fitting or a wider barb on the waterblock exit. Hmmm. :P
btw, I see a Chevette heatercore for $17 at Autozone... I don't know if it's copper, though.
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