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Timing chain is tight. Can take #4 cylinder offline and cut down on some of the noise. Feel like it is in the bottom end... valve, wrist pin, or rod that has come loose.

I had the same noise and had a mechanic tell me it was the timing chain. Two weeks later the noise was much worse when started like something had come loose. Rockers check out fine and mechanic says motor is bad. Havent torn into the motor, but he said sounds like wrist pin or something has...