{HEAD ~ A cam shaft} of an engine is provided with a timing change mechanism which is driven by hydraulic pressure to alter {TAIL ~ the timing} of a intake valve  
{ HEAD ~ A cam shaft } of an engine is provided with a timing change mechanism which is driven by hydraulic pressure to alter { TAIL ~ the timing } of a intake valve
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH