an injection mold for producing a two - piece golf ball includes first and second cavities having mating hemispherical inner surfaces with retractable pins for supporting a solid core within the cavities spaced from the inner hemispherical surface . a runner system is provided in the mold for distributing flowable plastic material . a plurality of tunnel gates substantially equally spaced about the perimeter in one of the sections interconnect the inner hemispherical surfaces to the runner system with the tunnel gates being vertically offset from the parting line surface of the two sections . the pins support the solid core in its premolding condition such that the center of the core is slightly offset from the centerline of the mold in the direction of the inner hemispherical surface of the cavity containing the tunnel gates .