Quote:
Originally Posted by CHANMADD
If you have PCV 's in both ,you could run the risk of creating too much vacuum in the crankcase and actually start sucking oil into the intake. The simpler the better!
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I don't believe more than one PCV valve is recommended. One valve controlling the vacuum and outflow, and then one or two breathers for inflow. It would be really simple if those breathers didn't need to be vented into the air cleaner to trap back-flow fumes. (As many have nointed out, that's only a smog control feature and has nothing to do with properly venting the crankcase.)