When you hear the noise, open the oil filler cap on the valve cover. If it goes away. The most common cause is pcv missing an o-ring. I haven't seen the vids because this place doesn't allow it... but that'* about the only thing Dan hasn't suggested, off the top of my head.
We'll a little more information. I've had two mechanics come by and look at it, one brought a stethoscope with him. They both hear the noise coming from under the rear valve cover. Just for giggles on the suggestion of one of the mechanics i changed the oil and filter with 10w30 and added a quart of Lucas Oil treatment (I dont plan on keeping the lucas in there for long). The noise is about the same if not a little more intermittent. I removed the oil filler cap and the oil filler housing while the engine was idling so I could look into the engine and didn't see any oil movement in there. I figured I'd see all kinds of oil sloshing around. I'm wondering at this point if I don't have an oil pressure issue. I've read where someone had a stuck check valve and also read where the oil pump in the late model 3800'* are pretty bullet proof so I'm not sure what to check next.
Sorry to wait so long to tie this one off. It ended up being a failed bearing keeping the oil pressure from building up. I sourced a 2004 3800 engine from a reputable junkyard with 66,000 miles on it. I had my mechanic do the new plenum when he did the engine swap it should be good to go for a while. It purrs like a kitten. I just had my fuel pump start acting up though... Starting a new thread. Thank you ALL for your help!