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I agree with Marv that the NACA scoop on top is probably in a low
pressure area.  Most people seem to have the oil cooler scoop on the
side, and the bottom of the cowl should be even better.

My scoop is on the left side and the oil cooler (Stewart Warner 8406R)
is mounted on the firewall.   Oil cooler outlet just dumps into the
firewall area.  I would like to have vented the oil cooler outlet to the
outside, but there isn't much(any) room left in that region.  Oil temp
reaches 200 only on hot climbout, and normally runs 185 to 192.  The
NACA scoop is about 5" high and 1.5" deep with a short piece of 3" dia.
scat connecting to a fiberglass plenum which covers the inlet face of
the oil cooler.

When I first got this plane, I had cruise oil temps of 225, which were
caused by not enough outlet area at the bottom/back of the cowl.  The
nose gear door had been extended to completely cover the slot where the
nose gear strut sticks down.  This was not a good idea,  and sawing off
the extended nose gear door solved the problem.

Bob Belshe
N19BJ