Abstract: Reusable core apparatus for a casting mold is disclosed. The apparatus includes a first core mechanism for being disposed in a casting cavity of the mold to define a first internal casting surface within the cavity, a second core mechanism for being disposed in the casting cavity to define a second internal casting surface in the casting cavity, and a securing mechanism for securing the first and second core mechanisms together in a predetermined engaging relationship within the casting cavity. The securing mechanism is adapted to maintain the first and second core mechanisms in the predetermined engaging relationship while an article is being cast in the mold and to release the first an second core mechanisms from the predetermined engaging relationship after the casting process so that the first and second core mechanisms may be directly and easily disengaged with each other and from a cast part so that the first and second core mechanisms may be reused in casting additional parts.