ORIGINAL: av8tor1977
ORIGINAL: w8ye
If you are going to turn the cylinder 180 degrees, you have to tuen the piston 180 degrees also so the boost port cut outs in the piston will align with the boost port in the cylinder.
And so that the piston ring ends don't end up crossing a port, where they might get caught. If that happens, the engine makes a nice, albeit expensive paperweight.
AV8TOR