Not sure what caused the sludge. More than likely, poor oil change service intervals. Currently, the main items have been cleaned to the best the parts washer could get. I'm not looking for off the shelf new....but a good 90% of the sludge is gone.
I'll post some pics tomorrow of the progress.
Stufe that has been cleaned:
-cylinder heads
-pushrods
-oil pickup tube
-oil pump
-oil pan
-rocker arms