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These engines are so easy to pull, I can't imagine it would be worth your effort to mess with timing chains in the car. If you replace the chains you will have to re-time anyway, and I can't imagine how painful that would be in the car.
a knock noise can be several things, not many of them are super great. Does it make the noise if you rev the engine in neutral, or just under load? If it will make the noise in neutral you should get a mechanic's stethoscope and an assistant and figure out exactly where the noise is coming from.
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