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Do I need a PVC valve on one of the valve covers? Someone told me that I don't need one and can just run a breather on each side.
 

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Here's another on the subject: How important are breathers?

There may be at least one another one. They probably should be merged if someone can find them all.
 

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I would not recommend a Poly vinyl chloride valve. An engine compartment is not a good environment for it. I think all street cars should have a positive crankcase ventilation valve though. Not only will the engine live longer due to fewer contaminates in the engine oil, you can also make more horsepower by reducing crankcase pressure.
 
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