Patent ID: 7066131

Claim:
A cylinder head in which seat rings, against which are placed intake valves, are mounted respectively on a plurality of intake ports that communicate with a combustion chamber of an internal combustion engine, wherein, an intake manifold and a camshaft are positioned at opposite sides sandwiching the cylinder head, two intake ports are aligned in a direction from an intake manifold side towards a camshaft side of the cylinder head, and an eccentric seat ring, with a center of an inner diameter of this eccentric seat ring being eccentric relative to a center of an outer diameter of the eccentric seat ring, is mounted on one of the intake ports which positions at the camshaft side while a standard seat ring, with a center of an inner diameter of this standard seat ring matching a center of an outer diameter of this standard seat ring is mounted on the other side of the intake ports which positions at the intake manifold side.