Is it true that USAAF P38s had both clock and counterclockwise engines installed and the ones the RAF operated both turned in the same direction?
The RAF aircraft turned in the same direction as they used the same power plant as the P-40 for commonality, but as mentioned by others they never took delivery except for a few for test purposes.
USAAF aircraft all had props that turned outboard at the top, the prototype had props that turned inboard at the top. The USAAF set up produced a more stable gun platform because of reduced pitching moments with power alterations.