Holley Sniper installation - a Guide for beginners

Fuel and Air Systems

  1. Triple Black 73

    Triple Black 73 Well-Known Member

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    Getting an EFI tank is by far the best way to go. Unfortunately, there wasn't any EFI tanks for 71-74 B-Body when I installed mine.

    You're welcome. Is there anything I can expand on?
     
  2. Triple Black 73

    Triple Black 73 Well-Known Member

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    Doing this should work fine. However, I noticed an issue with the ECU resetting when turning the key very slowly. Added the timed relay prevents this possible issue. It was an extra $45 in the $4500 EFI project.
     
    Last edited: Jul 6, 2019
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    • KMopar

      KMopar Member

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      When notching a dual plane manifold, how much is enough? Can too much be removed?
       
    • vance.dykes

      vance.dykes Well-Known Member

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      it is best to run a single plan intake with a bolt on throttle body . with that said i think you would cut all of the divider out maybe sell the duel plain and get a single plain
       
    • kiwigtx

      kiwigtx International Mod Staff Member FBBO Gold Member

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      Same problem here....External fuel pump, increased capacity ....92 litres instead of around 60, and a nice clean tank without the filling issues ...
      upload_2019-7-9_7-57-52.png

      upload_2019-7-9_7-58-1.png

      upload_2019-7-9_7-58-11.png

      Building a metal shroud to cover the pipe ...eventually. Currently has a wooden box to conceal the hole. :)
       
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      • kiwigtx

        kiwigtx International Mod Staff Member FBBO Gold Member

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        Taken during trial fitting....

        upload_2019-7-9_8-1-43.png
         
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        • Triple Black 73

          Triple Black 73 Well-Known Member

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          I heard that 3/4 inch deep and 1-1/2 inches wide at the divider does the trick. You just need just enough to equalize the pressure seen by the MAP sensor. If you cut too much, the runner will bleed pressure between the planes and you'll lose some of the torque benefits of a dual plane. Cut too little and you have erratic MAP readings. Talk to Holley tech support, they will know best.

          For me, I've been planning EFI way back so when I saw a single plane, low raise, spread-bore Holley Street Dominator for a 383 pop on Craigslist, I jumped on it. The old Thermo-Quad didn't care for it, but I didn't care for it either. I loved the sound of the TQ secondaries at WOT, but that was about it. That Thermo-Quad is going on a 383 or 400 build of all the parts we have left over which might end up powering a Dakota for Lemons racing.
           
        • andyf

          andyf Well-Known Member

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          I run a Sniper on a Performer RPM. Works fine without touching the intake manifold. I've helped install a bunch of Sniper setups on dual plane intakes and haven't seen any issues. I suspect the whole "EFI doesn't work on a dual plane" is a myth.
          DSC_2521 (Large).jpeg
           
        • bearman

          bearman FBBO Gold Member FBBO Gold Member

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          what's up with the motor plate. you put extra ears on it and why if you don't mine. andy the engine bay is looking sweet as the rest of the car.
           
        • Mr Belvedere

          Mr Belvedere Active Member

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          I've seen it in person this week so don't believe it's a myth. Edelbrock EFI on a friends 390FE with a dual plane Edelbrock. Certain plugs fouled, others fine(I forget which), AFR showing good but still unburned fuel in exhaust and an off idle stumble if floored. Installed a half inch spacer and both issues have been resolved.
           
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          • rrTor-Red

            rrTor-Red FBBO Gold Member FBBO Gold Member

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            Triple Black 73- Thanks for the post! I'm seriously looking into/wanting EFI for my 71 RR. Where did you find a tank, or did I miss that part?
             
          • rrTor-Red

            rrTor-Red FBBO Gold Member FBBO Gold Member

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            Andy-Do you have a website? Your inbox full, sorry
             
          • Triple Black 73

            Triple Black 73 Well-Known Member

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            The 71-74 B-Body boys are being left out in the dang cold when it comes to EFI tanks. Mainly because we have three different type of tanks for four different year models. The only option right now is to custom make a new tank or retro fit an existing tank.

            I highly recommend staring with a mild steel tank and then having a laser cut shelf welded in the left front corner of the tank. See post #11 of this thread:

            https://www.forbbodiesonly.com/mopa...-a-guide-for-beginners.174430/#post-911282196
             
          • rrTor-Red

            rrTor-Red FBBO Gold Member FBBO Gold Member

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            I found this on Aeromotives site. i emailed them like 1 1/12 months ago and was told "nothing now, nor in the future" for my application but now they do. I need to contact them again or possibly go there since close to me, when I get home from my deployment.

            https://aeromotiveinc.com/product/gen-ii-stealth-fuel-tank-71-72-charger-road-runner/
             
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            • 1 Wild R/T

              1 Wild R/T Well-Known Member

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              I'm not Andy, but I have your answer..
              http://arengineering.com
               
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              • themechanic

                themechanic Oklahoma is OK FBBO Gold Member

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                Edelbrock and FAST both make a sump kit you mount in the engine bay.

                https://www.edelbrock.com/adjustable-universal-efi-sump-fuel-kit-67gph-35-90-psi-36031.html

                https://www.fuelairspark.com/efi-fuel-sump-kit.html
                 
              • Triple Black 73

                Triple Black 73 Well-Known Member

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                I would buy that in a heart beat! I'm having issue with leaks and now the fuel level. $500 bucks is less than what I spent on the pump and getting my tank botched up! Plus the cost of the tank, that's over $700 that I spent.
                 
              • andyf

                andyf Well-Known Member

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                Perhaps some intakes have an issue. Like I said, I haven't seen an issue with the Performer RPM. Holley does now offer a four hole sealing plate which might solve some issues. https://www.holley.com/products/fue...efi/sniper_efi_service_components/parts/520-2
                 
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