The intake and exhaust valves alternately and selectively opens and closes, and simultaneously openes during a valve overlap period, in synchronism with {TAIL ~ a rotation} of a crankshaft to open the passages to the combustion chamber, wherein said apparatus controls a valve timing of the intake valve and {HEAD ~ the valve timing} of the exhaust valve in accordance with a running condition of the engine 
The intake and exhaust valves alternately and selectively opens and closes , and simultaneously openes during a valve overlap period , in synchronism with { TAIL ~ a rotation } of a crankshaft to open the passages to the combustion chamber , wherein said apparatus controls a valve timing of the intake valve and { HEAD ~ the valve timing } of the exhaust valve in accordance with a running condition of the engine
OTH OTH OTH OTH OTH OTH 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH