{TAIL ~ This VVT} is controlled to change {HEAD ~ the valve overlap} of the intake valve and an exhaust valve, thereby adjusting the suction and exhaust in and from a combustion chamber 
{ TAIL ~ This VVT } is controlled to change { HEAD ~ the valve overlap } of the intake valve and an exhaust valve , thereby adjusting the suction and exhaust in and from a combustion chamber
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH 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 OTH OTH OTH