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