Oil Cooler position question.

[MarkWebb]

All cars seem to have the oil cooler mounted at an angle whereas the aircon one is vertical(maybe due to it size). Is there any reason for this? I cannot think of one.
I am fitting individual intank fuel pumps and need to drill @3.5 inch holes in the sloping part of the tanks. Hence I need the oil cooler vertical.

Edited by MarkWebb on Saturday 9th May 20:54

Edited by MarkWebb on Saturday 9th May 20:54

[MarkWebb]

My oil gets v hot when car is used on track but in normal road use stays too cold (@60 deg C) even with an oil stat!