Where is the thermostat on a 4.7 liter dodge v8?

There's no single "thermostat" location on a 4.7L Dodge V8 engine in the way you might be thinking. The engine uses a thermostat *housing* which contains the thermostat. This housing is located at the very front of the engine, on the intake manifold. To be more precise:

* On the engine block itself: It's usually on the lower intake manifold, where the coolant flows from the engine block into the rest of the cooling system. You'll see a large housing with coolant hoses entering and leaving it.

You'll need to consult a repair manual specific to your year and model of Dodge vehicle (the 4.7L was used in several) for exact visual confirmation. A repair manual with diagrams will show you exactly where it is and how to access it. A simple online image search for "[your year and model] 4.7L engine thermostat" might also provide helpful visuals.