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Originally Posted by morepowerjoe
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Well, damn, I guess I missed my research, bc I kept thinking that those were either for DOD/AFM equipped GM V8 engines only (or L99). I’m guessing this valley cover is the LS3 specific one, since the L99 has a PCV valve built into the driver side valve cover (as well as revised baffling under the valve cover)?
I kept seeing the DOD/AFM delete engine valley cover block-off plates and got confused about how the stock PCV systems worked. Yeah, so then it probably is something to do with engine valley cover/PCV system (through the engine valley cover) then..?
The engine valley cover gasket didn’t look like it would cover or help with the PCV system on the valley cover itself, which also led to my initial confusion about the root of my oil blow-by issue.