If thick turns out to be the way to go this is one way
of making thick more efficient.

As Jeff mentioned:

"I would run hot water in second radiator then cooler water
through the front for a true two pass counterflow arrangement.  This
could be very compact and efficient." 

You could use four Suzuki Swift or Geo Metro rads and get some
talented person to weld them up.

Paul Lamar       thick.gif
 
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