james coffman wrote:

Paul,  Since you were uncomfortable with the drawing I
went to NAPA today and physically measured one which
is 13 1/2 wide 9 height and 3 1/2 deep.  Thanks  Jim
Coffman

The middle one has these advantages:

1: The back of the rad is totally unobstructed.

2: The duct to the rad protects it from engine heat.

3: The rad is on the cool side so no radiant exhaust heat
   can get to it.

4: The plumbing is simpler and more reliable. One rad instead of two.

5: The cowl is slicker.

6: No need to weld or epoxy inlets and outlets on the rads.

7: The rad is thinner so there will be more mass airflow at climb
   speeds or a smaller inlet can be used for less drag.

Paul Lamar
 
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