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Like I said, the clanking turbo was presurized gas, back feeding into the next cylinder, and into the intake side, when the intake valve was open. I think you said the turbo was OK, but be sure to check it. A bad intake valve will cause that symptom too, and mostly that's what I was thinking...

If an intake valve is burned, it can still detonate in the manifold and make back pressure in the manifold. When you start it, you can check for combustion by holding your hand on that exhaust port. If that one is colder, it is not firing. That is what it is sounding like. The back pressure...