Interesting thought. I'd bet a 180 would thump, but why stop there? How about something closer to 90 degrees to give you a real "lope". I bet the counter-balancers would eat up a lot of power though.
Along the same lines; a conversion done on Yamaha XS650 for racing is to convert into 277 degree motors. Originally they're 360 motors. The racers are looking for the smoothest power pulse which would be where the firing cylinder at TDC, while the alternate piston is accelerating upward and at the point of maximum speed. It works out to 277 on those engines. The actual degrees has to do with the stroke length & the length of the rod.
