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Well, keep in mind I'm not a mechanic.

I think you mean a PCV valve, not a PVC valve. PCV stands for Positive Crankcase Ventilation. A system using a PCV valve evacuates gases from an engine's crankcase, and I believe they always go on top of the crankcase. It's purpose is for fuel economy and the environment.

For more info goto wikipedia:

http://en.wikipedia.org/wiki/PCV_valve

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15y ago
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Q: What does a PVC do and what does it stand for and where does it go in an engine?
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