[ByronRACE]

So if you're running a PCV with an open crankcase, how did you tune around the vacuum leak?

With a PCV, the air path would the through the breathers, through the crankcase, through the PCV, and into the carb...which is a vacuum leak. That air would not flow past the carb venturis and fuel wouldn't be metered for it...which should cause a lean condition most noticable at idle and light throttle.

Did you just richen idle fuel to compensate? Any weird off-idle stumble problems?