Rotatable valve assembly for cylinder head of internal combustion engine

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

• one or more combustion chamber heads each comprising:
• at least one intake valve opening in association with corresponding at least one intake rotatable valve assembly;
• at least one exhaust valve opening in association with corresponding at least one exhaust rotatable valve assembly;
• wherein each of the at least one intake valve assembly and the at least one exhaust valve assembly comprises:
• a valve body comprising a tapered surface along at least a portion of a circumference of the valve body, the valve body is arranged to mate with a valve seat surface of a respective valve opening of one of the at least one intake valve opening and the at least one exhaust valve opening;
• a rotatable valve shaft attached to the valve body such that the rotatable valve shaft being parallel to the valve body, the rotatable shaft is rotatably supported in the cylinder head to thereby enable rotation of the rotatable valve shaft and the valve body about a predetermined rotation axis and by a predetermined rotation angle;
• and
• a valve arm attached to a rotatable valve shaft's end such that the valve arm being perpendicular to the rotatable valve shaft, the valve arm is arranged to operate the rotation of the rotatable valve shaft and the valve body.