Hi Cain,
On my IV I first mounted the cooler under the gear box. It was not in direct
Air flow propwash. It worked ok,but on hot days and long climbs my oil temp
Would slowly climb until I backed off.
The second mount moved the cooler above the gearbox (I don’t have the stock
Air cleaner carb heat box) Now I can climb as long as I want and my water temp
And oil are great some would say to cool. I will try to post a few photos soon