An ignition coil and {TAIL ~ spark plug} are associated with {HEAD ~ each cylinder} of the engine 
An ignition coil and { TAIL ~ spark plug } are associated with { HEAD ~ each cylinder } of the engine
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH