Q&A

 Master

First things I think of are an exhaust leak where the manifold connects to the cylinder head, and a valve lifter or camshaft problem making noise under the valve cover.
The exhaust leak is easy to find if you listen carefully under the hood, maybe using a piece of tubing in your ear to pinpoint the source.
If the noise is from under the valve cover, it's most likely a cam or lifter problem.
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