Cylinder head 15 also houses intake and exhaust valves 8 which allow {HEAD ~ fuel mixture} to enter and exhaust gases to exit {TAIL ~ combustion chamber} 19 
Cylinder head 15 also houses intake and exhaust valves 8 which allow { HEAD ~ fuel mixture } to enter and exhaust gases to exit { TAIL ~ combustion chamber } 19
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH