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did you remove the cam sprockets? i bet you did.under the 22mm bolt head there is a washer that needs to be turned over and put back the other way when you retighten the cam bolt.if you take it off and look at it and the surface to which it fits you will see why.if they are not flipped when reinstalled you will get the sprockets rocking against the keyways while the engine is running and it sounds just like chain noise.
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