A cylinder head arrangement is provided. The arrangement may include a cylinder head having at least one valve chamber defined therein. The arrangement may also include at least one rotary valve, accommodated in the valve chamber, the rotary valve having a curved portion, two side portions and at least one flow passage intersecting the curved portion and at least one of the side portions, and thereby defining flow openings in the curved portion and two side portions. In addition, the arrangement may also include at least one deflector arranged adjacent at least one side portion of the rotary valve in which a flow opening is defined.