The video link has decent sound. If people can't access that, please let me know (I'm not sure why video embedding doesn't seem to work)!

 

Morning bump, still have this. I don't notice it getting any worse, but I'm scared I'm going to be driving along and then BOOM cam shaft seizes...

 

Have you removed the valve cover and inspected it for any abnormal wear? Fairly quick and easy.

 

Just pulled the valve cover and inspected. Didn't notice any unusual wear or grind marks or metal shavings which made me happy. I should have bought feelers to do a valve adjustment while I had it off too but a storm was rolling in so I just put it back on . The one part I couldn't see was underneath the pan that separates the top most portion of the valve cover from the rest of the valve train (where the hole I use for a breather comes in).

 

Lol. Solved. I noticed the sound would go away if I plugged the hole and put my ear up to the valve cover. I also noticed it would go away with no indication if I put my finger 1" away from the hole. So I thought about it and grabbed an oil jug, dabbed some on on finger, and smoothed it around the plug. Noise gone. It was the hot air pushing through at higher speeds (after warm up) and the lack of lubrication causing it to shear due to perfect conditions like a tea-pot. Glad it wasn't anything serious but