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PCV valves for 304

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  • PCV valves for 304

    Anyone know the standard way of routing the PCV valves on a 304. The pass side valve cover has one PCV but no hose, and there was a hole on the drivers side valve cover. I installed anothe PCV valve on the driver side but it created too much internal pressure inside the engine, and resulted in blowing oil out the dipstick tube. I beleive that I should install a flame arrestor on the drivers side and leave the pass PCV valve on, but hook it up to the air cleaner assembly. I am using a Holley two barrel carb, and there are no stock emission controls added to the engine. Any help would be greatly apprecited.

  • #2

    Your right run it to the valve cover and use the flame arrestor on the other side if there is a hole.
    Tow strap? : histeric


    • #3
      One thing for sure is the PCV valve is hooked up to direct manifold vacuum, not a carb vent.
      Second thing is it needs a vent somewhere?
      My 345 is different as the PVC comes from the valley pan under the intake manifold. It also has a vent from the air cleaner to the valve cover.
      What the PCV valve is doing is ventilating the crankcase. It is sucking air (fumes) from the crankcase and clean air must go in.
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