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Dumb Question?

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OK I should know this! The breather tube on top of the valve cover, does it SUCK or does it BLOW??:blink:


It normally, 99.9% of the time, allows air IN to replace combustion and water vapor that is drawn past the PCV valve into the intake by intake vacuum. In rare cases of heavy throttle or worn rings the blow-by exceeds the PCV valve's ability to draw it in and flow reverses OUT the valve cover breather.


If it blows that sucks.

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