A rotary head plate having a first precision surface and a second precision surface. The rotary head plate mounted to the first sub fixture. A second sub fixture being able to freely rotate with the rotary head plate when rotated. A tailstock plate mounted to the second sub fixture. The tailstock plate having a first precision surface and a second precision surface, A first head plate attached to the first precision surface of the rotary head plate and the first precision surface of the tailstock plate. A second head plate attached to the second precision surface of the rotary head plate and the second precision surface of the tailstock plate. The first head plate and second head plate adapted to each receive two cylinder heads. The first head plate and second head plate each including at least one cylinder head opening.
