•  A lightweight, quenched aluminum alloy with excellent heat conductance has been adopted for the cylinder heads.

•  Compact, pentroof shaped combustion chambers have been adopted together with spark plugs positioned at the apex of the combustion chamber to provide improved combustion efficiency.

•  The intake/exhaust layout consists of valves set at a 39° parting angle, and two cross-flow type intake and exhaust valves per cylinder for improved intake/exhaust efficiency.

•  The cylinder head bolts are plastic region tightening bolts to be tightened in five motions to insure tighteningstability.

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•  With the adoption of direct injection, the structure of the cylinder head consists of an injector with an edge that reaches the combustion chamber.

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