Die cast cylinder head

A cylinder head assembly for an internal combustion engine, the cylinder head assembly comprising:

• a cylinder head including first and second bearing supports;
• a cylinder head cover coupled to the cylinder head and including third and fourth bearing supports;
• a first bearing supported by the first bearing support and the third bearing support;
• a second bearing supported by the second bearing support and the fourth bearing support;
• and
• a cam shaft including a first portion that is rotatably mounted within the first bearing and a second portion that is rotatably mounted within the second bearing, wherein the first and third bearing supports define a first annular groove and the second and fourth bearing supports define a second annular groove.

A cylinder head assembly for an internal combustion engine, the cylinder head assembly comprising:

• a cylinder head;
• a cylinder head cover coupled to the cylinder head;
• a rotatable cam shaft;
• and
• a rocker shaft supported by the cylinder head cover, and
• a first rocker arm pivotable about the rocker shaft, the first rocker arm having a first hole, wherein the cam shaft includes a first cam lobe that engages the first rocker arm, and wherein the rocker shaft includes a first lubrication hole, the first lubrication hole adapted to intermittently align with the first hole.