Cylinder head of a DOHC type engine

摘要

A cylinder head includes a cam holder mating surface and a cylinder mating surface. The cam holder mating surface is non-parallel with respect to the cylinder mating surface. Ignition plug holes are formed in the cylinder head and a cam holder. The plug holes are aligned and have a common extension axis which is perpendicular to the cylinder mating surface and non-perpendicular to the cam holder mating surface. A bolt attaches the cam holder to the cylinder head and extends in a direction which parallels the extension axis of the plug holes, is perpendicular to the cylinder mating surface, and non-perpendicular to the cam holder mating surface.