said internal combustion engine is {TAIL ~ an overhead valve type engine} and a combustion chamber of {HEAD ~ said engine} is interchangeable among a pan cake shaped, semi spherical shaped, bath tub shaped, and wedge shaped combustion chamber 
said internal combustion engine is { TAIL ~ an overhead valve type engine } and a combustion chamber of { HEAD ~ said engine } is interchangeable among a pan cake shaped , semi spherical shaped , bath tub shaped , and wedge shaped combustion chamber
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH