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Technical PCV and brake booster question

Discussion in 'Traditional Hot Rods' started by Cubzy, Jul 14, 2016.

  1. Cubzy
    Joined: Jul 13, 2016
    Posts: 56

    Cubzy
    Member
    from Canada

    I know there has been lots of discussion about this but unable to find what I was looking for. I have a 31 Ford coupe that I'm installing a Edelbrock AVS 650 on soon. The car has no brake booster as the brakes don't have vacuum assist. My question is can I run the PCV valve from the back of the passenger valve cover to the back of the Edelbrock port? I believe the port for booster and one for PCV are both the same area of the system. Both are 3/8 inch. This would allow my install to be much cleaner, less hose. There is no issue of tieing into another system and no chance of PCV oil going into the booster canister. Thanks in advance. By the way H.A.MB. is a great resource. Its helped me a lot of the last year and now decided to join.
     
  2. you may have people tell you that it cant go there for what ever reason, but the reality is it will work just fine. I have run them on both ends in multiple cars and there was never an issue. It just needs straight manifold vacuum for the PCV to function properly. I have seen the booster and PCV run into the same port, I believe a 300 6 in an f150 from the 80's came that way, but I don't like it and have always thought they should be separate. But yes you should have no problem running it to the back of the carb. Just make sure you have the fitting tight on the back and not vacuum leaks at the fitting.
     
    Last edited: Jul 14, 2016
  3. You can do what you want and listen to who you want and ask who you want.

    Edelbrock doesn't recommend it.
    image.png
     
  4. Montana1
    Joined: Jan 1, 2015
    Posts: 2,135

    Montana1
    Member

    Welcome aboard!

    I too have seen them both ways, but you might want to watch your carb calibration if it is not hooked up to the carb port. The carb port is just a controlled vacuum leak.

    It might go rich on you if you block off the carb port giving you a strong vacuum signal, but it can be corrected with needles and jets. Then again, it might be OK! Let us know how it turns out.
     
  5. Cubzy
    Joined: Jul 13, 2016
    Posts: 56

    Cubzy
    Member
    from Canada

    Thank You for all the reply's. I will give it a try and let you know my findings.
     
  6. figure8
    Joined: Oct 4, 2006
    Posts: 99

    figure8
    Member

    I run mine off the back side port. Both are manifold vacuum, so should be no difference in performance, and the back port makes for a cleaner appearance.
     
  7. deathrowdave
    Joined: May 27, 2014
    Posts: 4,824

    deathrowdave
    ALLIANCE MEMBER
    from NKy

    Power brake booster is really not a vacuum leak as is the PCV is controlled leak , drawing in from crankcase . Both in one spot has no effect as long as it is full port
     
  8. Scott De Shields
    Joined: Mar 23, 2011
    Posts: 165

    Scott De Shields
    Member

    Good to hear the feedback. I am running the PVC in place of the road draft tube on my 55 Olds. It goes to the back of the stock 4 barrel carb and shares with with the brake booster valve.
     
    Studebakermatt likes this.

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