Lifter problems????
OK, I got the valve cover off.
#6 Intake is screwed....It's super loose, the rocker arm flops around and everything..no tension at all.
All the other rockers are at various positions of rest, and they all have tension to one degree or another. Even if I can't move them, I can spin them with my fingers smoothly.
Based on this alone I'm feeling confident it's a lifter. Right in the postion it sounded to be coming from too, back end of right side.
Gonna go back out and take the rocker shaft off and see what I can see.