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timing chain guide maybe? do you have anything done to the engine? It really could be a number of things. There are a ton of normal 'ticking' noises and some not so normal. Anything from an exhaust leak and aftermarket injectors to timingchain or valvetrain noise from changing motor oil weight can cause a knock or tick noise. A video might help us diagnose it with you. Any other indications? Oil light on?
knocking could be anything from engine knock to a spun bearing. If it were rod knock it would be VERY loud and audible at all RPMs. don't think that's your issue from what you described.
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