Edelbrock Air Gap

Discussion in 'Small Block Mopar Engine' started by 68 Coronet RT, May 13, 2018.

  1. 68 Coronet RT

    68 Coronet RT 68 GTS # 508 in Registry

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    Anyone have a Air Gap intake that they could measure the depth and length of the cutout of the plenum wall where the carb sits. I wanted to buy the Air Gap but living in a little colder climate the Performer RPM is a better choice, now I would like to modify it like the Air Gap
     
  2. BigBlockMopar

    BigBlockMopar BigBlockMember

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    No cutout on mine.
    Just a straight up divider wall upto the carb flange (which had a good amount of (core) shift which hit the throttle blades and prevented more than half throttle. Nice work mr. Edelbork!).
     
  3. MoparMike1974

    MoparMike1974 Well-Known Member

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    I have two. No cutout on one, the other I cant get to at the moment.
     
  4. rumblefish360

    rumblefish360 so close yet so far away

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    You’ll find a better performance gain with a spacer. But if you have the room under the hood.
     
  5. 72bluNblu

    72bluNblu FABO Gold Member FABO Gold Member

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    Neither of mine has any cut out. People add them, but they don’t come with them. Or at least they haven’t for awhile.

    I also run mine with a 1” spacer and a drop base air cleaner.
     
  6. furrystump

    furrystump Well-Known Member

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    Mine didn’t have it. Install it with out it and try it with a spacer and without. That way you’ll know if wants one or not.
     
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    • mbaird

      mbaird mbaird FABO Gold Member

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      None yet here either...
      20180514_082512.jpg
       
    • furrystump

      furrystump Well-Known Member

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      Is that for a 273? Magnum?
       
    • rumblefish360

      rumblefish360 so close yet so far away

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      That is a small block engine, that one pictured is for the Magnum series engine, 318/360.
       
    • furrystump

      furrystump Well-Known Member

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      The vertical intake bolts
       
    • mbaird

      mbaird mbaird FABO Gold Member

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      Yep... magnum.
      I just realized I never opened it to look.
       
    • 68 Coronet RT

      68 Coronet RT 68 GTS # 508 in Registry

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      The number for the Performer RPM for the early 340's is 7176
       
    • 72SwingerJosh

      72SwingerJosh Well-Known Member

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      Pretty sure Edelbrock only puts that notch in the Chevy ones.
       
    • KnuckleDuster

      KnuckleDuster Well-Known Member

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      I just had mine ported, and the porter cut .020 out of mine. I didn't know he was going to. He did all the R&D on the P6 and P7 heads for Penske racing, and ported all their heads that won a NASCAR Championship, so I'm betting he had a reason, and not complaining.

      I have run this intake with and without a 1" spacer, and couldn't feel a difference on the street.
      The only time I ran the spacer at the track I was having unrelated fuel starvation issues, so no good data to compare.

      FB_IMG_1525988118367.jpg
       
      Last edited: May 14, 2018
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      • AJ/FormS

        AJ/FormS 367 FormS clone 3.09-1.92-1.40-1.09-.78od 3.55s

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        I run that AG up here North of the 49th, until mid October...... WithOUT a choke. I am back on the road as soon as the sweeper-trucks have made the rounds; April or May. I have started it on warm February days to go for a quick spin,brrrrrrrr. Buuuutt I have a DP carb, and 185psi cylinder pressure. Not bragging just saying.
         
      • ir3333

        ir3333 Well-Known Member

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        why do you want the notch.It was on some older intakes so you could use the old holley carbs.I don't think you will gain anything.
         
      • 68 Coronet RT

        68 Coronet RT 68 GTS # 508 in Registry

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        This is true, I called Edelbrock as I wanted some answers before I milled and the Tech told me that Edelbrocks dyno runs with the mopar Airgap didn't show enough gain in HP or torque with the wall notched out so they don't offer it. The Tech did say the best thing I could do is run a half inch laminate spacer to help dissipate the heat, any taller spacer would effect the low end torque. So I'm probably going to leave it as is and run a spacer.
         
      • Lelo Dart

        Lelo Dart *

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        Oh, it's worth something. Seen this?
         
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        • 68 Coronet RT

          68 Coronet RT 68 GTS # 508 in Registry

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          I saw this video, unfortunately they are not using a MOPAR. They are using a modified 350 chevy . According to the Edelbrock Tech that I talked to today, Edelbrocks dyno test did not show a substantial increase in HP or Torque on the Mopar intakes like the chevy intakes that's why Edelbrock does not offer the Mopar AirGap with the cut out wall. The tech said I could mill it out if I desired to do so but said not to go any deeper than a 1/8 of a inch.
           
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          • Lelo Dart

            Lelo Dart *

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            Intake Manifolds - Chrysler - Big-Block - Performer RPM Series - Edelbrock, LLC.
            Big block. Chevy or Mopar the function and respective design is the same. If I ever have my Air-gap off again I will for sure be milling the divider. Not enough hood clearance for a spacer. The spacer is doing the same thing as milling the divider. Allowing the carb to get signal from both banks of the engine. "The problem is that the dual-plane design limits performance, since each cylinder only gets to benefit from half of the carburetor’s available induction flow. Modern dual-plane intakes resolve this issue with a notch in the plenum divider."
             
          • rumblefish360

            rumblefish360 so close yet so far away

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            @ou812 Perhaps you can comment on what you have found with spacers on top of the Edel. RPM? As well as a mild divider if you have done such?
            Thanks.

            Lelo, The spacer adds plenum volume. The nothc doesn't. Thats about the only thing. Build dependent, extra plenum volume may be good.
             
          • leblanc

            leblanc member 2883

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            My 79 360 runs on a RPM air gap no: 7576 and runs like a scalded dog.
             
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            • ou812

              ou812 Well-Known Member

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              1" open really improves power from about 2500rpm and up...also cleans up the A/F ratios with most carbs....
               
            • rumblefish360

              rumblefish360 so close yet so far away

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              Thanks Brian.
               
            • 68 Coronet RT

              68 Coronet RT 68 GTS # 508 in Registry

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              So is Brian talking about a 1" open spacer or a 1" wall cut out ?
               
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