Holley Sniper
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Instructor
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From: Lebanon Ohio
Holley Sniper
Perhaps my search skills aren’t so good…but can’t find anything where anyone has installed a Holley Sniper EFI system. Would be on a ‘71 350, with an Edlebrock Performer Vortec #2116 Dual plane intake.
Anyone have a Yay or Nay?
Anyone have a Yay or Nay?
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You really need a single plane for best operation. The Edelbrock Torquer 2 is one option that then requires careful air cleaner selection for stock sbc hood clearance.
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First, Do a Google search for "Corvette Holley Sniper Install". Tons of stuff will come up including several links to threads on this site.
Seems the Sniper is the forum favourite. Lots of information out there. Using the search feature on this forum usually doesn't work to well.
I run a different brand of EFI on my 77. I did a thread on it about 2 years ago.
And after a lot of trial and error. I would agree. find a single plane manifold.
Seems the Sniper is the forum favourite. Lots of information out there. Using the search feature on this forum usually doesn't work to well.
I run a different brand of EFI on my 77. I did a thread on it about 2 years ago.
And after a lot of trial and error. I would agree. find a single plane manifold.
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Yeah I’m a little tight under the hood for sure. However I saw something about the dual plane and in lieu of a spacer the article suggested removing the manifold and milling out that divider wall under the carb seat, like maybe 3/4” deep, and essentially accomplish the same thing as using a spacer. It would either work, - or ruin a good manifold I reckon.
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I machined out the divider on my Performer RPM manifold.
Made little difference. The runners are short and long on a duel plane. On a single plane runners are very close to equal length.
Made little difference. The runners are short and long on a duel plane. On a single plane runners are very close to equal length.
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From: Lebanon Ohio
Ok. Well basically I think that was my main concern. No sense reinventing the wheel here. I’ll go ahead and chase down a manifold and proceed. Many thanks. I’ll plan to keep y’all posted.
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Best of luck with your conversion. It's an excellent modification.
Is my vette stock?? HAHA
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I used the Torquer 2 on my 327. IT ran great...not so well on my big block with a stock dual plane with tthe center milled down. There are a lot of threads on here about the Sniper system. I had one and there was atleast 2 others.....
On my 327 I ran a spacer as well but had the L88 hood for the space
On my 327 I ran a spacer as well but had the L88 hood for the space
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From: Lebanon Ohio
The original 350 block sits in the car, rebuilt before I bought it, and has Gen III (?) Vortec heads. Runs pretty strong actually. But I’m simply intrigued with converting to the EFI. But these heads limit my choices for a good affordable single plane intake. Holley has the 4150 Single Plane that fits but the advertised ‘power band’ is 2500-7500 RPM. Makes me a little uncomfortable with low RPM everyday cruising. My current carb/intake setup happily turns a corner in 4th gear 12-1500 RPM and pulls right on out.
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That advertised rpm range is more for a carb that requires certain vacuum profiles for proper fuel metering. Basically, it need good suction for satisfactory performance. EFI doesn’t adhere to the same requirements as the fuel is atomized under pressure, so lower vacuum signals are not as much of an issue. In other words, ignore the rpm ranges when moving to efi.
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Sniper
Im doing the conversion on my 70 454. Im on hold as i have not been able to find a Torker 2 intake as its on back order. I have also been searching for a used one to no avail.
i heard the same when I talked to EFI pros where I purchased the unit, single plane is the way to go.
ill document the install but it will probably be sometime next year. its real important to have top condition wiring, grounding and voltage. Im upgrading the alternator , grounds etc. Im also doing dual fans, electric headlight conversions so i cant tax the system.
good luck
*****
i heard the same when I talked to EFI pros where I purchased the unit, single plane is the way to go.
ill document the install but it will probably be sometime next year. its real important to have top condition wiring, grounding and voltage. Im upgrading the alternator , grounds etc. Im also doing dual fans, electric headlight conversions so i cant tax the system.
good luck
*****
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From: Lebanon Ohio
Factoid, thanks for that info. Maybe there is a reasonable path here afterall. Indeed fuel injection is a different animal from a carb and effects of vacuum.
Wvleon, I too will try to update the forum on my project and look forward to yours.
Based on all the above my next charter will be to take a look at stack heights to make sure this conglomeration fits under my flat hood!
Wvleon, I too will try to update the forum on my project and look forward to yours.
Based on all the above my next charter will be to take a look at stack heights to make sure this conglomeration fits under my flat hood!
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From: dayton oh
Nsarge -- Hello from BCreek (north of you), there are 2 torquer manifolds for sale on CList -- one in Springfield (powdercoated black) and one outside of Columbus (normal alum).
Good luck and bring your completed project by our "hobby" shop in Waynesville sometime. PM for address
FAST
Good luck and bring your completed project by our "hobby" shop in Waynesville sometime. PM for address
FAST
Last edited by Fast81; Oct 26, 2021 at 08:23 PM.
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From: Lebanon Ohio
Thanks for the heads up, - and for looking that stuff up. It’ll take a look.
From what I dug up today the overall height of the shortest rise single plane (which I believe is the Holley 300-263), plus the height of the Sniper, would be a little over 1/4” taller than whats in my car now. And it’s actually so close now I’m kinda amazed the aircleaner isn’t rubbing under the hood.
To make sure though I’m gonna get some clay and form some ***** to sit on the air cleaner and close the hood just to make sure. I’d love to keep moving on this project but I’m really fearful it ain’t going work underneath a non LT1 type hood.
Fast81, yeah I’d like to meet you. I’ll get in touch.
From what I dug up today the overall height of the shortest rise single plane (which I believe is the Holley 300-263), plus the height of the Sniper, would be a little over 1/4” taller than whats in my car now. And it’s actually so close now I’m kinda amazed the aircleaner isn’t rubbing under the hood.
To make sure though I’m gonna get some clay and form some ***** to sit on the air cleaner and close the hood just to make sure. I’d love to keep moving on this project but I’m really fearful it ain’t going work underneath a non LT1 type hood.
Fast81, yeah I’d like to meet you. I’ll get in touch.
Safety Car
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From: Fairfax Virginia
First, the Holley Sniper works just fine on top of an Edlebrock "Air Gap" RPM Intake Manifold and it even fits under the hood on my Corvette with a Holley Stealth Sniper mounted and working on it. My C3 is a BB so I don't know how that will work on a small block.
IF you want really GOOD information try calling the guys at EFISYSTEMPRO.COM and they will help you design a complete system that will work for you. This company offers the VERY BEST in Customer Service after buying a system from them. They will design the system for you if you need then too.
I am using a "factory" 1968 L88 Hood and intake assembly which makes it a bit easier to get the stuff under neath it. I wish you luck in finding a way to get the Sniper under the hood! You will like the system once it is educated and knows your Corvette!
Check out the Holley OEM Fuel Tank Modules as they have the fuel pressure regulator inside the fuel tank and flow exactly what the EFI needs.
IF you want really GOOD information try calling the guys at EFISYSTEMPRO.COM and they will help you design a complete system that will work for you. This company offers the VERY BEST in Customer Service after buying a system from them. They will design the system for you if you need then too.
I am using a "factory" 1968 L88 Hood and intake assembly which makes it a bit easier to get the stuff under neath it. I wish you luck in finding a way to get the Sniper under the hood! You will like the system once it is educated and knows your Corvette!
Check out the Holley OEM Fuel Tank Modules as they have the fuel pressure regulator inside the fuel tank and flow exactly what the EFI needs.
Last edited by ctmccloskey; Oct 27, 2021 at 01:04 PM.
Is my vette stock?? HAHA
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First, the Holley Sniper works just fine on top of an Edlebrock "Air Gap" RPM Intake Manifold and it even fits under the hood on my Corvette with a Holley Stealth Sniper mounted and working on it. My C3 is a BB so I don't know how that will work on a small block.
IF you want really GOOD information try calling the guys at EFISYSTEMPRO.COM and they will help you design a complete system that will work for you. This company offers the VERY BEST in Customer Service after buying a system from them. They will design the system for you if you need then too.
I am using a "factory" 1968 L88 Hood and intake assembly which makes it a bit easier to get the stuff under neath it. I wish you luck in finding a way to get the Sniper under the hood! You will like the system once it is educated and knows your Corvette!
Check out the Holley OEM Fuel Tank Modules as they have the fuel pressure regulator inside the fuel tank and flow exactly what the EFI needs.
IF you want really GOOD information try calling the guys at EFISYSTEMPRO.COM and they will help you design a complete system that will work for you. This company offers the VERY BEST in Customer Service after buying a system from them. They will design the system for you if you need then too.
I am using a "factory" 1968 L88 Hood and intake assembly which makes it a bit easier to get the stuff under neath it. I wish you luck in finding a way to get the Sniper under the hood! You will like the system once it is educated and knows your Corvette!
Check out the Holley OEM Fuel Tank Modules as they have the fuel pressure regulator inside the fuel tank and flow exactly what the EFI needs.
Dr. Detroit
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From: New Braunfels Texas
The RPM Air Gap has the divider milled down out of the box and that is why it works well with the Sniper. Problem with the Sniper is that it gets its MAP signal from only one venturi.....and on a dual plane, the two sides are different on exactly what requirement they need.......on a carb this is fine because a booster pulls what the booster can pull....but on EFI, both sides are dependent on a signal from one side.
The other thing is that a dual plane intake was ONLY designed to signal a carb and for NO other reason. There is zero benefit and even a loss running a dual plane with an EFI because one sides runners do not flow as well as the other side........the Air Gap RPM style intakes do the best job of flowing air but by design are flawed on one side compared to the other.
EFI does not need a signal as mentioned and works best with an open plenum.....
Try E-Bay for a nice used unit......hundreds of old intakes in perfect condition for dirt cheap......
Jebby
The other thing is that a dual plane intake was ONLY designed to signal a carb and for NO other reason. There is zero benefit and even a loss running a dual plane with an EFI because one sides runners do not flow as well as the other side........the Air Gap RPM style intakes do the best job of flowing air but by design are flawed on one side compared to the other.
EFI does not need a signal as mentioned and works best with an open plenum.....
Try E-Bay for a nice used unit......hundreds of old intakes in perfect condition for dirt cheap......
Jebby
Is my vette stock?? HAHA
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I had some pics of the puddles of fuel in my runners. When I pulled the intake there was fuel pooled up in the valves. It was amazing