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