Patent ID: 8745866

Claim:
A method of molding a valve lifter guide of an engine block of an internal combustion engine, the method comprising: preparing a mold having a mold cavity configured to form a valve lifter guide; determining a flow path of material to be injected in the mold cavity by including a thin walled section in the formed valve lifter guide; selecting a gate position in the mold cavity for a gate to inject material into the mold cavity according to the determined flow path of material; and injecting material into the mold cavity through the gate, such that a leading edge of the material flow path forms a dam when the leading edge of the material flow path crosses a thin walled section of the mold cavity, and the dam changes a direction of a portion of the leading edge of the material flow path until the leading edge of material flow meets a trailing edge of the material flow path within the mold cavity.