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Most valve cover manufactures can utilize standard NA fittings if you get to correct size and angle etc. Keep in mind all valve covers are not built the same. I just went through this and had several issues until I found the right combination of things that correct my issues after I replaced my valve covers. Keep in mind, stock valve covers for the Camaro (ZL1 in my case) have a baffle built into the, and some aftermarket valve covers have them as well, but some do not. Attached is a cutaway of a stock ZL! valve cover that shows the built in baffle.
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