Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

Vac reading at carb

Discussion in 'The Garage' started by Muddytazz, Feb 12, 2006.

  1. Muddytazz

    Muddytazz 1 ton status

    Joined:
    Jun 30, 2002
    Posts:
    20,073
    Likes Received:
    0
    Location:
    Salem, Or.
    Do you always check vacuum on the carb and below the butterflies?
     
  2. 1-ton

    1-ton 1/2 ton status Premium Member

    Joined:
    Apr 17, 2004
    Posts:
    2,884
    Likes Received:
    162
    Location:
    Las Vegas, Nevada
    Below the throttle plate is where you will get intake manifold vacuum, as oppossed to port vacuum, which is above the throttle plates.
     
  3. Muddytazz

    Muddytazz 1 ton status

    Joined:
    Jun 30, 2002
    Posts:
    20,073
    Likes Received:
    0
    Location:
    Salem, Or.
    Call my stupid or having a brain fart here, but throttle plate is in the base plate or the one at the top of the carb?
     
  4. HarryH3

    HarryH3 1 ton status Author

    Joined:
    May 31, 2000
    Posts:
    10,384
    Likes Received:
    2
    Location:
    Georgetown, TX
    The one at the base plate.
     
  5. Muddytazz

    Muddytazz 1 ton status

    Joined:
    Jun 30, 2002
    Posts:
    20,073
    Likes Received:
    0
    Location:
    Salem, Or.
    So really I should take a vac reading off a vac port off the intake, not the carb at all
     
  6. 1-ton

    1-ton 1/2 ton status Premium Member

    Joined:
    Apr 17, 2004
    Posts:
    2,884
    Likes Received:
    162
    Location:
    Las Vegas, Nevada
    You can do it both ways.
     
  7. Muddytazz

    Muddytazz 1 ton status

    Joined:
    Jun 30, 2002
    Posts:
    20,073
    Likes Received:
    0
    Location:
    Salem, Or.
    Reason I say that is cause all my ports on the carb are ABOVE the base plate
     
  8. 1-ton

    1-ton 1/2 ton status Premium Member

    Joined:
    Apr 17, 2004
    Posts:
    2,884
    Likes Received:
    162
    Location:
    Las Vegas, Nevada
    Are we talking about a Q-jet? All Q-jets have a port connected to the bottom plate. It is usually on the right side of the base plate. It is a large port about 7/16 to 38".
     
  9. Muddytazz

    Muddytazz 1 ton status

    Joined:
    Jun 30, 2002
    Posts:
    20,073
    Likes Received:
    0
    Location:
    Salem, Or.
    Nope, holley truck avenger
     
  10. Muddytazz

    Muddytazz 1 ton status

    Joined:
    Jun 30, 2002
    Posts:
    20,073
    Likes Received:
    0
    Location:
    Salem, Or.
    Ok, I found the full manifold vac port on the carb
     

Share This Page