An internal combustion engine is provided having a pair of cylinders interconnected by {HEAD ~ means} of {TAIL ~ a narrow connecting channel} 
An internal combustion engine is provided having a pair of cylinders interconnected by { HEAD ~ means } of { TAIL ~ a narrow connecting channel }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL