"Chris W" wrote in message
...
The previous post on this topic got me wondering. Just how different
would the two engines need to be? I'm no expert, but it seems to me cam
shaft(s), magnetos, and prop are the parts that would be different from
one side to the other. I almost forgot, reverse the polarity on the
starter motor. What am I missing?

How about an engine with the crankshaft running out the front and back, so
you could mount a prop on the either end? That way you could have
counter-rotating props using the same engine.