Troubling sound at back/top of motor

I drove the car for about 80 miles today and it came back with a new and unhealthy sound near the back/top of the engine. I removed both belts from the pulleys in front and the sound persisted. I used the stethoscope and the sound seemed to be coming from under the intake manifold. When the motor is rev'd the sound is drowned out and does not increase in intensity. I am guessing it is something in the valve train. A video that somewhat captures the noise is below. Any ideas? Thank you.

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8/27/2212:19 PM

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