11. The simplest arrangement is a single transfer and single exhaust port , opposite each other. 12. As the piston is pushed inward, it uncovers exhaust ports in the cylinder wall. 13. At cruising speed, reflected wave exhaust port blocking occurred at too low a frequency. 14. In 1970, AMC changed the head to the " dog-leg " exhaust port design. 15. There is a central square exhaust port on the cylinder wall uncovered by the piston. 16. The cylinder casting contained steam supply and exhaust ports . 17. Spark plugs were located in the side of the cylinder head, between the exhaust ports . 18. Surplus gas and powder residues are evacuated through an exhaust port in the gas cylinder. 19. The YF-23 has such serrations on the exhaust ports . 20. The exhaust ports were also modified with a higher port roof, which reduced flow restrictions.
