Bradley David Automotive Animation

the aim is to give you just that LITTLE BIT more knowledge about the mechanics of a car

To be honest, with an NA engine, you don't need one. The reason why it is a good idea to have one in a turbo charged car is that if you have a synthetic oil, the rapid cooling of the oil caused by switching the engine off straight away after a long run can cause the oil to calcify. Turbo's don't tend to last too long if that happens!

I was just going to say that. I had a 2000 Dodge Avenger v6 that was SOHC 24 valve.

so where would a wastegate go?

before it reaches the turbine/hot side

As KSK4lyfe said, on the exhaust manifold just before the turbine. The idea behind a wastegate is to prevent the turbo from boosting too high. Putting it there allows it to "vent" excess boost accurately (it sees what the turbo sees), while still allowing the turbo to maintain it's peak desired boost level. Think of it like a "controlled leak" that prevents you from blowing up a balloon so much that it pops.

...or 32 valves.

goog

How come Honda's V6 engines are all SOHC?