The application relates to a cylinder head offset chamfer design. An engine includes a cylinder block and a cylinder head assembly. A plurality of cylinders are defined between the cylinder block and the cylinder head. The cylinder head assembly includes a cylinder head, a plurality of channels defined within the cylinder head, the channels fluidly coupled to the plurality of cylinders via a plurality of cylinder ports. Each of the cylinder ports includes a chamfered portion. The cylinder head assembly further includes a plurality of valves, each of the plurality of valves selectively coupled to a respective cylinder port of the plurality of cylinder ports.

A cylinder block (10) includes an inter-bore flow passage (14) between adjacent bores (12). Each inter-bore flow passage (14) is formed by closing an opening-side groove portion (15) continuous from a cylinder block deck face and a bottom-side groove portion (16) with the use of a lid member (20) made of copper, and the lid member (20 is laser-welded to a groove wall face of the opening-side groove portion (15). Before the laser-welding, the lid member (20) has recesses (26) that are interspersed in a direction, in which a laser beam travels, at any one of connected portions at which the lid member (20 is connected to the groove wall face of the opening-side groove portion (15).