Crankcase ventilation, makes sense.
EGR, this hole is not drilled through to anything. But I believe you as to it's location as well as some heads that I was looking at online asked for EGR or Non-EGR.
Obviously these ones are Non-EGR heads. Thanks.

What about the drilling of the oil return to make these heads work on either side of the engine.
Have you done it?


69 Dart