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Timing Chain

Engine

Model: 964, Year:1992, Mileage:146000, Type of use:Street use only
I have a distinct engine rattle noise at 3600 to 3800 rpm that I have noticed over the last year. I hear it only in this rpm range and only when the windows are open and sound is reflected in but when I rev by hand at the engine I cannot hear it. This occurs whether or not the engine is under load. I had the chain guides/rails replaced under 2k miles ago by a reputable Porsche shop. Any thoughts here?

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