I finally had a chance to pull the heads off yesterday and then dropped them off at the machine shop today for a full cleaning and valve job.
I checked all the piston walls for excess wear and everything looked perfect. all the walls were nice and smooth.
all of the piston faces had plenty of carbon build up except for number 6. It was pretty clean so they may have been some water leakage from that part of the head gasket.
I still need to check all the lifters for possible damage but I'm pretty sure the are fine.
I'll be putting everything back together next weekend so we'll see if that solves the valve noise problem.