When the
oil began belching from both valve covers, there was one breather on each valve cover and the oversize rear breather was in place. The rear manifold breather provides noticeably more open area for venting than the typical round breather.
I decided to add more portals to vent the excess crankcase pressure, and added another pair of valve cover breathers. Although the root problem still existed, this band aid eliminated the belching.
The photos are dated Aug. but the 2 extra breathers were added in early May.
