Jerry Hey wrote:

 Putting the radiator in at an angle is a pain in the ass.   Just lay
 it flat and all those problems go away.  Fits very nicely within a
 Tailwind cowl.   Why not?  Jerry

The back of the wedge needs to come to a sharp point more or less.
If it is too square back there (like shown) all the air stacks up
at the back.

Move the rad back as far as it will go and you will get a nicer
shape for the cowl.

Here is what I had in mind for the oil cooler. Dave Atkins
has been flying for years with this configuration. He could
use more open exit louvers however. His current louvers are a bit
restrictive.

Paul Lamar

Paul,  I have revised the drawing of the rad. installation per your
suggestions.   It looks  good to me.
Thanks,  Jerry

BTW I used to be against louvers as being bad for aerodynamics.
I now think they are the lessor evil. Radiators MUST be unobstructed
on their back sides.

Paul Lamar
 
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