* 4.6L V8: This engine had 2 valves per cylinder, for a total of 16 valves.
* 5.4L V8: This engine also had 2 valves per cylinder, for a total of 16 valves.
* 6.2L V8: This engine had 2 valves per cylinder, for a total of 16 valves.
Therefore, there's no single answer. It depends on which engine was in the specific 2009 F-150. All the commonly available engines in that year had 16 valves.