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Carburetor gasket: 4 hole or open?

Discussion in 'The Venerable Q-Jet' started by racerxjj67, May 17, 2012.

  1. racerxjj67

    racerxjj67 Well-Known Member

    Ready to install my new Q-jet and was wondering if there is any major difference whether I use a 4-hole gasket or the open type. I'm leaning toward the 4-hole because I'm using the TA performance dual plane intake and think the extra gasket material would seal better between the carb and intake. Thoughts?

    J-
     

    Attached Files:

    racerxjj67, May 17, 2012
    #1
  2. 462 Chevelle

    462 Chevelle 462 chevelle

    4 hole on stock open on aftermarket intake
     
    462 Chevelle, May 17, 2012
    #2
  3. GS Jim

    GS Jim Platinum Level Contributor

    I went to an Autozone and asked for a Carb base gasket. The guy gave me an open One. I told him I wanted a Four Hole. He said What's the difference. I looked at him and said if he didn't know the difference he shouldn't be working here. He got pissed and walked away.
    PONCH
     
    GS Jim, May 17, 2012
    #3
  4. my69buford

    my69buford Platinum Level Contributor

    Thanks for this. I posted a thread of my own about a week ago and got one response to use the open gasket on my stock manifold. I kind of thought the 4 hole was correct.
     
    my69buford, May 17, 2012
    #4
  5. 462 Chevelle

    462 Chevelle 462 chevelle

    It won't hurt to use te open note stock intake but dont run te 4 hole on aftermarket because pieces of the gasket will end up in the motor if te gasket isnt trimmed out
     
    462 Chevelle, May 17, 2012
    #5
  6. racerxjj67

    racerxjj67 Well-Known Member

    Here's my concern with not using the 4-hole gasket.

    The attached photo of the dual plane intake shows it has a divider. So I thought that if I used the open gasket it would create a 1/16 inch gap between the carb and intake. So using the 4-hole gasket would fill that gap. Granted, I don't know if such a gap would have any adverse effects, but it deserved some thought.

    Thoughts?
     

    Attached Files:

    racerxjj67, May 18, 2012
    #6
  7. Greg Gessler

    Greg Gessler GS Stage1

    For that intake, I would use a 4 hole to seal plenum divider and promote max torque and carb signal. Open gasket if you plan to run acarb spacer.
     
    Greg Gessler, May 18, 2012
    #7
  8. racerxjj67

    racerxjj67 Well-Known Member

    See that's what I was thinking. I thought I was being logical in my thinking. Just needed to confirm.

    Thanks Greg.
     
    racerxjj67, May 18, 2012
    #8
  9. Cliff R

    Cliff R Well-Known Member

    Keep in mind that with factory divorced choke set-ups, going to a thicker than stock gasket changes the relationship between the intake mounted choke and carburetor choke mechanism. Without changing the length of choke rod, the choke will take longer to unload, and may not work properly without adjustment, or getting/making a longer rod.

    I'm with Greg on the 4 hole gasket to improve "signal" to the carburetor, even when going to a thicker version. At most, on a stock type 4 hole intake, you might want to trim out a small piece between the secondaries. This allows the plenums to "see" each other, and can show a minor performance gain with some set-ups.......Cliff
     
    Cliff R, May 18, 2012
    #9

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