3.9 L Cam/Timing chain noise @42K mi. Normal?

Lucas oil treatment is your friend,

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if you like rolling the dice and not tearing it down to put the new timing chain in.

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It would take a lot off Lucas, or any other goo to quiet a timing chain. You'd literally have to fill the engine to the top of the cam sprocket. This would make it impossible for the pistons to move, immobilizing the crankshaft. An engine with no moving parts is going to be quiet.