Ken Welter wrote:

  Here is a couple other photos of the cooling system.
  I went to eastern Oregon yesterday and in 95 degree temps the oil
temp was 150 and water was 180 on a long hard climb out.

  Ken Welter

Nice fan you have on the back side of the rad Ken.
If you make a new longer cowl with a smaller hole you might
cut the drag a bit without affecting the cooling and up the top speed. 
I think the hole  size is a bit overkill.

Paul Lamar
 
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