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Vents on valve covers?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by mountainexplorer, Nov 25, 2002.

  1. mountainexplorer

    mountainexplorer 1/2 ton status

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    Has anyone ever seen these on valve covers before? They seem to be part of some sort of ventilation system. I was told that each side had tubes that ran down into the headers when these were on a motor in a Blazer.
     
  2. ratlover

    ratlover 1/2 ton status

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    They look kinda like the edelbrack elites or something. Just a regular breather for your VC instead of using a PCV system. But they do have a little threaded 90 stuck on there it looks like...... /forums/images/graemlins/confused.gif

    What you describe(with it connected into the header) is called a crank case evacuation system. It is used on race cars and dosnt work well on the street. A tube goes from your VC to a bung welded into the header and at higher rpm a venturi is created at the bung and thus a vaccume created in the tube that pulls out ecses crank case pressure. This system dosnt work well at lower rpm and can cause the pressure to not want to be released as well as a regular breather. It is a race only peice. This system dosnt even belong in a street/strip king of ride.

    The breathers may be able to be removed and regular ones put in.....maybe not, if they can be removed then the VC's are good, other wise its a PITA that isnt worth it IMO.
     
  3. DieselDan

    DieselDan 1/2 ton status

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    I've seen than "evac" system also set up with one valve cover plumbed to the header collector (w/a check valve), the other valve cover was plumbed to the intake (PVC).
     
  4. Chubby

    Chubby Registered Member

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    They might have be plummed together. I have seen a couple of those sets of VCs' with a tube run between them , not sure what the purpose was...maybe equalization?
     

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