{TAIL ~ Cylinder head} 15 may be made of {HEAD ~ aluminum} or steel in the normal manner 
{ TAIL ~ Cylinder head } 15 may be made of { HEAD ~ aluminum } or steel in the normal manner
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH