A cam plane is defined perpendicular to the longitudinal axis and disposed between the open ends of the cylinders and {HEAD ~ a second end} of {TAIL ~ the engine housing} 
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A cam plane is defined perpendicular to the longitudinal axis and disposed between the open ends of the cylinders and { HEAD ~ a second end } of { TAIL ~ the engine housing }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL