well since water-viscosity isn't that high that isn't a concern.. u could better spend ur money on a descent water-radiotor instead of a oil-radiator.
btw i have a airco-radiator of the local car-breaker's yard. its from a seat ibiza!
just 12 Euro (say $10)
with 14 tubes going throught it.
dimensions :
13.5cm x 23.5cm x 4cm
5"2/8 x 9"2/8 x 1"5/8
well spend money eh?
u gotto tell me how much that perma-cool radiator costs..
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OC'ing is my middlename