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Old 04-29-2021, 08:02 PM   #12
Mike C
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Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,714
Re: Remove baffle on new valve cover?

The PCV doesn't do anything at wide open throttle because there is no engine vacuum WOT. But there is a vacuum over the top of the carburetor at full throttle. So at WOT and high crankcase pressure, the vent side is under a vacuum in the OEM plumbed setup.
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