Abstract: A cylinder head assembly for an internal combustion engine including a cylinder head, a water jacket mountable to said cylinder head, and a fuel injector and a spark plug mountable in the water jacket so as to extend through the cylinder head and into a corresponding combustion chamber. The spark plug and fuel injector are mountable along either a first or second axis, and the cylinder head has an injector recess shaped to receive the spark plug and the injector along both first and second axes.