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Originally Posted by morepowerjoe
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So, idk if I was confused initially or after, but I guess I stick with my original research. What you showed me, is the equivalent of GM P/N 12570471, which is an identical engine valley cover to the one on my LS3 (GM P/N 12599296), except the baffling system underneath the cover, is for AFM/DOD-equipped GM V8 engines.
The LS3 engines don’t have a PCV system like the L99, as far as I’m concerned, which makes use of small orifices in the breather ports (to slow down blow-by). For the Ls3, it simply “recirculates” the outlet (engine valley cover port) to the inlet (intake manifold port), with a “U”-shaped quick-connect valve (GM P/N 12599298), which they identify as a “PCV” (older example, GM P/N 12594779)….
I guess both the LS3 and L99, and other GM V8 engines have part of the PCV system, on the passenger side valve cover. This is where the 90-degree breather port, has a connection routed to the air intake hose. Is the passenger side valve cover port supposed to intake metered air? I remember leaving the valve open or with a breather filter; and both would cause a lean engine condition. Once I either blocked off the passenger side breather port, or connected it to the intake hose, it would resolve the lean CEL code…