I've recently bought a 1994 F22B2 Accord with 52k miles. The previous owner had recently changed the oil with proof and it's at level and of good color. I installed a performance intake and had brake pads changed along with the master brake cylinder that wasn't holding pressure. I've recently noticed a clicking or knocking sound coming from what I believe is the valve cover but I'm not sure. I'm picky about sounds so I noticed it but it isn't to loud. Car hasn't lost power, isn't smoking or having worse mpg.

Here's a video of the sound
I had a mechanic friend listen to it and he says its lifter tap. Please help!