{HEAD ~ Device} for changing the timing of {TAIL ~ intake and exhaust valves} in an internal combustion engine 
{ HEAD ~ Device } for changing the timing of { TAIL ~ intake and exhaust valves } in an internal combustion engine
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH