A spherical rotary valve assembly for an internal combustion engine of the piston and cylinder type wherein the spherical rotary valve assembly is positioned within a split cylinder head having an upper and lower section (110,112) such that when secured defines cavities (113) for a rotational shaft having mounted thereon, an intake drum (10) and an exhaust drum (40) for each cylinder, the lower half of the split head having an inlet port (108) and an outlet port (109) in communication with each cylinder, the cylinder head having an intake passageway and an exhaust passageway in communication with the drum cavities in the split cylinder head, the split cylinder head having reservoir cavities positioned adjacent the intake drum and exhaust drum, the intake drum being fed from both sides of the intake drum for the introduction and interruption of fuel/air mixture into the cylinder, the exhaust drum being evacuated from both sides of the exhaust drum thereby evacuating and interrupting the evacuation of exhaust gases from the cylinder, the intake drum and exhaust drum rotating within the cavities and a gas-tight sealing rotation on an annular sealing means (116) actually positioned about the inlet port and outlet port of the lower section of the split head assembly, respectively. IMAGE
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