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I am sorry that you have not been helped yet. I just came online and saw your question
To be honest, I am not sure what a cluck cluck sound would be. Do you mean a metallic clacking noise, a metallic knocking noise, a metallic rattling noise?
Also, please remember that I am not there and therefore rely on you to provide as much detail as possible and may need clarification at times
Ok, have you listened with a mechanic's stethoscope at the valve cover, timing cover and then the oil pan to isolate where the noise is coming from? If not, we need to do that