Abstract: Tooling for injection molding a wax pattern in connection with investment casting of a metal wood golf club head, in which the golf club head is a positive duplicate of the wax pattern and has a body having an exterior, a hollow interior accessible through an orifice, a weld rim surrounding the orifice, and at least one gate disposed on the weld rim. The tooling includes collapsible core means having a shape complementary to the interior of the golf club head and the wax pattern. The collapsible core means may be disassembled and removed from a wax pattern formed around the core means. The tooling also includes a tooling body that defines a sealable wax pattern cavity that is complementary to the exterior of the golf club head and includes passage means to allow injection of molten wax into the cavity.