* 3.5L V6: This engine had 24 valves (2 per cylinder).
* 5.7L Hemi V8: This engine had 16 valves (2 per cylinder).
* 6.1L Hemi V8: This engine also had 16 valves (2 per cylinder).
So there's no single answer; it depends on which engine was in the specific 2006 Dodge Charger.