Holly Sniper 2bbl efi system

[Mattmatt001]

Just looking in, to see if anyone has installed a Holly Sniper 2bbl efi system into their Mustang?

just wondering what people thought / think of it and how it performs etc.

just exploring all options of carburation versus upgrading to 4bbl + intake etc.

So, tell me all about the pro’s and cons of the Holly sniper etc or the 4bbl version of the system.

Don’t have the skills to take the engine apart to put a cam in it etc.

Strictly Novice DIY skills

cheers.

[ALLAN R]

I would advise you to read all you can about the Holley EFI system on the net first, before pulling the pin on one, especially data on reliability and issues. I thought the reviews were very mixed with quite a few issues on fitting and subsequent issues down the line. Conversely the Edelbrock AVS2 carb has almost 100% amazing reviews, so I fitted one of these to my car and it has been faultless. You could also talk to Redline Garage (Redline American Muscle). I think they have fitted these EFI kits.

[pmustang]

I follow everything I can read on FI

Seems to be a giant PITA. Post after post about issues. Units being sent back as deceptive. Folks swapping back to carbs. I’ve wanted to do the swap since the easy fit systems came into the market several years ago and I am less likely than ever to install one

And if I installed one I would never do the 2bbl one because if it didn’t suit it would be impossible to sell in my opinion

[Mattmatt001]

I would advise you to read all you can about the Holley EFI system on the net first, before pulling the pin on one, especially data on reliability and issues. I thought the reviews were very mixed with quite a few issues on fitting and subsequent issues down the line. Conversely the Edelbrock AVS2 carb has almost 100% amazing reviews, so I fitted one of these to my car and it has been faultless. You could also talk to Redline Garage (Redline American Muscle). I think they have fitted these EFI kits.

What intake are you running with the Avs2 Carb? What CFM carb is it?

im exploring all options for upgrading the ‘Stang. It’s currently running a stock Autolite 2100 2 barrel - hence the question about the 2 barrel Holley EFI system.

I know a 4 barrel carb & intake will offer a mild upgrade to the stock build.

[ALLAN R]

What intake are you running with the Avs2 Carb? What CFM carb is it?

im exploring all options for upgrading the ‘Stang. It’s currently running a stock Autolite 2100 2 barrel - hence the question about the 2 barrel Holley EFI system.

I know a 4 barrel carb & intake will offer a mild upgrade to the stock build.

Go for the 1902 500CFM carb with an Edelbrock Performer inlet manifold. If you want to upgrade further get the Hedman Shorty headers (Hedman 88400 Mustang Shorty Headers Painted Square Port 289/302 1965-1973 (cjponyparts.com))
The headers made a big difference on my car and helped the whole engine flow gas better. It's no good upgrading the carb and inlet manifold and leaving the cr@p iron exhaust manifolds on the car. There are more expensive ceramic coated headers available from Hedman (88406) - these are the dogs but expensive.

[missfastback]

Allen couldn't agree more regarding the 1902 fitted mine in the summer straight out of the box it ran so much better than the Holley I had on before

[ALLAN R]

Allen couldn't agree more regarding the 1902 fitted mine in the summer straight out of the box it ran so much better than the Holley I had on before

That is the first thing I noticed when I bolted it on, the idle was so smooth and the idle vacuum two points higher. Also, there is no hint of an off idle flat spot with dead smooth acceleration all the way to wide open throttle. The Holley I had was lumpier at idle and I had to mess with main jets to cure an off idle flat spot. The only things a perfect EFI system could offer me is a smoother idle from dead cold. I have to hold the engine on the throttle for about 40 seconds before it will idle on the choke and can be driven away. Once going on the road, it will soon idle smoothly enough to push the choke in. Maybe an auto choke would be better, but I bought a manual choke carb. Also, an EFI has the potential to be more economical but the AVS2 is a big improvement over the Holley on MPG.

[Mattmatt001]

That is the first thing I noticed when I bolted it on, the idle was so smooth and the idle vacuum two points higher. Also, there is no hint of an off idle flat spot with dead smooth acceleration all the way to wide open throttle. The Holley I had was lumpier at idle and I had to mess with main jets to cure an off idle flat spot. The only things a perfect EFI system could offer me is a smoother idle from dead cold. I have to hold the engine on the throttle for about 40 seconds before it will idle on the choke and can be driven away. Once going on the road, it will soon idle smoothly enough to push the choke in. Maybe an auto choke would be better, but I bought a manual choke carb. Also, an EFI has the potential to be more economical but the AVS2 is a big improvement over the Holley on MPG.

Sorry to ask random questions; did your car have a manual choke pull cord or something like that? Or did you have to install one? For me I’d lean towards the electric choke version; for the sake of of a couple of wires - I think it’ll be a Breyer choice.

also; did you have to renew your vacuum pipes? As the AVS2 has a vacuum at the front & not the rear as mine currently has.

yep the questions keep coming…

what linkage did you use to connect the carburettor to the throttle? The original linkage with bar or something new. This sounds the ideal set up me, so gathering all the parts I’d need to do the job in one. Thank for your advice. It helps no end.

cheers

Matt.

[ALLAN R]

Sorry to ask random questions; did your car have a manual choke pull cord or something like that? Or did you have to install one? For me I’d lean towards the electric choke version; for the sake of of a couple of wires - I think it’ll be a Breyer choice.

also; did you have to renew your vacuum pipes? As the AVS2 has a vacuum at the front & not the rear as mine currently has.

yep the questions keep coming…

what linkage did you use to connect the carburettor to the throttle? The original linkage with bar or something new. This sounds the ideal set up me, so gathering all the parts I’d need to do the job in one. Thank for your advice. It helps no end.

cheers

Matt.

My car had a manual choke when I bought it, but it's mounted to the bottom of the dash, so I think it may have been added at some time. Because of this being in place I went with the manual choke, but I did do an AVS 2 conversion for our magazine editor and that was electric and works fine too, so I think it is down to personal preference.

As for vacuum pipes I have a large one on the front of the carb for the PCV and a small one for the ported vacuum to the dizzy. I had to make up a custom PCV pipe as I have different rocker boxes but I made a pipe up out of two stock PCV hoses.

I make a throttle linkage, you can buy throttle link ball ends from the net and the ones I bought were 5mm threads so you can either buy 5mm studding for the rod or buy 5mm plain rod and a 5mm die to cut threads.

[Dahk]

Hi Matt, I have fitted a 4bbl Holley Sniper EFI to my 1969 with 351W on my own.

I have experienced a number of issues which are both not apparent and not covered by the documentation or online forums (Holley forums or 3rd parties) and 'opinion boards'.

Send me a private message with a contact number if you want to chat and I'll talk you through the ins and outs, pros and cons etc.

Not to be rude to anyone here on the MOCGB forums who are all nice well-meaning folks, but they can sometimes not be helpful, and unless they actually have first-hand experience of having fitted and struggled with one of these systems themselves, you’re probably better getting the information from someone impartial who has.

If I sound slightly salty in what I’m typing here that’s because I am. But I'm pleased to say that with perseverance and hard work you can get one of these systems to work well.

Thanks

On a side note, I do NOT have any first hand experience with the Edelbrock AVS2, however as mentioned by the guys above I’ve heard only good things about the AVS2 and if you wanted to stick to a carburettor/none electronic solution the AVS2 seems like a safe bet, and less expensive than EFI*

I previously had an old Holley 4bbl (zinc) 80457 with and electric choke (just a heating element that once the engines on slowly opens the choke as the element gets hotter). The old Holley carb died kind of catastrophically. Holley Sniper EFI was not my first choice, I tried to source the more expensive Edelbrock Pro-Flo 4 system but due to no-supply and extra expense ended up using the Holley Sniper EFI.

[missfastback]

Going efi all depends on how much your going to use it if your only doing a couple of hundred miles a year then I would have the carb but if your going to do many miles then perhaps go efi you have to justify to yourself if it's worth the money going efi,what ever you do I'm sure you will enjoy the mustang