The Allison V-1710 was most interesting in that both left- and right-hand versions were made. P-38's had #1 prop turning left-hand, #2 turning right.
And the engines could be field-converted to swap rotations. The camshafts were turned end-for-end, starters and mags swapped, and presto the crank turns the opposite way. Not sure how they managed the oil pump, although a couple check valves could have handled reversing oil flow.
The P-39 prop (gearbox in the a/c nose) was right-hand, so the engine proper turned left-hand.