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