HF sells a cheap auto stethoscope works well I have used a long extension as metallic noise travels well up metal as Merlo suggested start puling plug wires in the area of noise if it changes then you have some lower end issues and shut down the eng drain oil and check if not pull valve cover see if you have a collapsed lifter exhaust noise is more of a tick than a knock loose flex plate or cracked flex plate will also cause a knock.
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