Cylinder head

A cylinder head located between a cylinder block and a head cover, the cylinder head comprising:

• a cam chamber arranged in an upper portion of the cylinder head, wherein the cam chamber opens toward the head cover;
• a projection that projects from a bottom surface of the cam chamber toward the head cover, wherein the projection includes an injector insertion hole;
• and
• a seating surface arranged in the bottom surface of the cam chamber, wherein the seating surface receives a valve spring, wherein
• the projection includes a top surface that defines an injector seal surface around the injector insertion hole, the projection includes a first portion and a second portion that are separated from the seating surface by different distances along the bottom surface,
• the distance of the second portion from the seating surface is longer than that of the first portion from the seating surface, and
• a side surface of the first portion is set to have a smaller draft angle than a side surface of the second portion.