Granted they are not mine, but of ones off of You Tube that sound exactly like what I am hearing to the tee.
I'd like to believe it's the tappets, but need a more knowledgeable opinion on these Fords.
When I pooped the hood and held my head over 1 and 3 it sounded more distinct. In addition I can hear this in my cab at a decent volume, but obviously duller. Of note - 50 miles ago I used Seafoam in the vacuum line, and that was a bit less then half a bottle. (The other 50% or so went to the gas.)
Any ideas to help a brother out w/ a solution?