A cylinder head assembly for an internal combustion engine having an intake cycle and an exhaust cycle is provided. The cylinder head assembly includes a single valve, a cylinder head body, and a venturi tube. The cylinder head body has an intake port, an exhaust port, and a combustion chamber port configured to intermittently seat the single valve. The venturi tube is disposed within the cylinder head body and has a high pressure portion operably coupled to the cylinder head body proximate the intake port and a distal end spaced apart from the combustion chamber port. The venturi tube permits the intake port to remain in fluid communication with the exhaust port during both the intake cycle and the exhaust cycle of the internal combustion engine.