Together, cylinder head lower wall 16 and {HEAD ~ piston upper portion} 18 define {TAIL ~ a combustion chamber} 19 for each respective cylinder 12 
define
Together , cylinder head lower wall 16 and { HEAD ~ piston upper portion } 18 define { TAIL ~ a combustion chamber } 19 for each respective cylinder 12
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH