Tommy Ivo was on TV a few days ago. He's a drag racing old-timer, who drove a number of cars having side-by-side engines oriented with the crankshafts parallel to the longitudinal (roll) axis of the car. He said that they were actually geared together, with one of the engines having a camshaft ground for reverse rotation (pretty standard with marine designs).

Is this something that you want to do just because you think that it is cool (I'm not saying that it isn't), or is this an effort to improve powered acceleration? I guess a better way of asking my questions could be, "what is the end result that you are trying to achieve?"