Thanks, John. Is there a GF40 thread that describes the issue you mention with the PCV system? Hours of searching and reading has yielded nothing so far.

Update: Found a little info on flyinggiants about how the PCV system is intended to work and how the crankcase inlet check ball can leak at high rpm. Interesting system with the tiny hole at the exhaust valve to aid in lubrication of the exhaust valve train, then expelling excess waste oil out the exhaust. Does the exhaust lifter or it's bore have a slotted passage?