Sorry....Do you guys read? Have you even reversed an engine once? You all claim that is not nessecary to rotate the cyl and piston, you claim it can't be done. I just told you that i did on the dle55. Just rotate youre prop the other way on youre own engine by hand and you will feel the difference in compression. This difference can only be taken away by rotating the cyl and piston.
Rest my case. Pffff.