So I installed Holley LS valve covers on my Sierra with L76 engine for the sole purpose to fix a leaky cover that I believe was warped and I couldn't get to seal up. Long story short they don't have a PCV valve, so I installed an inline check valve on the exit side of my Elite Engineering catch can like they say to, but I still filled up my can in about an hour of driving. So I saw that people say to switch to the LS9/LSA covers, but my question is, do they have a built in PCV? In the pictures I have seen they look very similar to the Holley ones. If that's the case, how do I stop them from sucking up all my oil?


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