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Holley Sniper EFI Self-Tuning Master Kit - Shiny

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Holley Sniper EFI

Holley Sniper EFI Self-Tuning Master Kit - Shiny

Now available on summitracing.com - SNE-550-510K

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Fuel System Type

Part # 550-510K

50 Reviews

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Emissions

This part is legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles.

See Emissions Details

Holley's Sniper EFI Self-Tuning Master Kit is the best way to upgrade your car to fuel injection in a cost-efficient way with just 4 simple connections required. Take your build to the next level and take advantage of improved engine performance, better MPG's and easier starting. Featuring a throttle body mounted ECU with no extra boxes to mount and a dual pattern bolt on design built to fit 4150 flange & spreadbore manifolds. This kit supports up to 650hp naturally aspirated and 575hp boosted with four 100 Lb/Hr injectors! Sniper is designed to be installed at home in your garage or driveway with limited tools and the support of Holley's comprehensive installation manual and videos. When it comes to tuning.. simplicity is what we strive for. Our simple calibration wizard allows you to just answer a few questions about your engine and the system will begin self-tuning with no laptop required. You don't have to be a computer wiz or specialize in tuning to use a Sniper EFI system! Use the high resolution 3.5" full color touchscreen for tuning and gauge displays. The Sniper EFI Master Kit includes a complete fuel system consisting of; 20ft of 3/8" vapor guard fuel hose, fuel pump, filters, and all necessary hardware to return fuel into your tank. Additionally, you're getting a 4.9 wideband oxygen sensor with a leak free oxygen sensor, oem style TPS/IAC, fuel pressure regulator, all Stainless Steel T-Bolt clamps and a Stainless Steel weldable flange. Once you made your conversion to EFI, don't stop there! Sniper is an Ecosystem. This kit pair's seamlessly together with Holley's Sniper Hyperspark Ignition, Fuel System's, Air Cleaners, Throttle Body & Digital Dash to unlock the full potential of your build.

Features:

Dual Pattern bolt on carburetor replacement, designed to fit 4150 Flange & Spread Bore manifolds - (Spread Bore Sealing Plate Part #9006 is recommended)
Self-tuning ECU means you don’t have to be a computer/tuning wiz to have EFI!
Simple Calibration Wizard (Answer a few questions about your engine and it creates the base map, then starts tuning on its own!) - NO laptop required!
Only 4 Wiring Connections Required! (Battery +, Battery - , Switched Ignition & RPM)
Throttle body mounted ECU – no extra boxes to mount
Supports up to 650hp with Four 100 Lb/Hr Injectors!
Includes complete fuel system consisting of; 20ft of 3/8” Vapor Guard Fuel Hose, Fuel Pump, Filters, necessary hardware and bulkhead fitting to return fuel into the tank!
Internal fuel pressure regulator eliminates the hassle of plumbing an external fuel pressure regulator (Preset to 58.5 PSI)
Integrated ignition timing control & coil driver
High Resolution Full Color Touchscreen for Initial Setup, Tuning, and Gauge Displays.
The included Genuine Bosch LSU 4.9 Wideband Oxygen Sensor provides realtime Fuel Map Learn!
OEM Style TPS/IAC and Fuel Pressure regulator, for years of dependable service.
Included clamp-on oxygen sensor kit ensures a leak free oxygen sensor installation, with Stainless Steel T-Bolt clamps and a Stainless Steel (Weldable) oxygen sensor flange
Patent Pending

Bangshift.com: The Caddy Powered C10 Gets A Holley Sniper EFI

RacingJunk.com: Installing Holley's Sniper EFI System

FullSizeBronco.com: Holley Sniper EFI Install

HOT ROD Tests Holley’s Sniper EFI

Brand	Holley Sniper EFI
CFM	800
Emission Code	3
Finish	Shiny
Flange Style	4150
	Dual Bolt Pattern
Fuel Pressure	58.5 PSI
Fuel System Type	Return
Height	3.28"
Injector Size	100 lb/hr @ 58.5 PSI
Inlet / Outlet Size	9/16-18 Female O-Ring (AN 6)
MAP Sensor	2Bar
Max Horsepower Rating	650 Naturally Aspirated
Product Type	Sniper EFI 4150 Master Kit
Transmission	700R4/200R4
	TH350
UPC	090127739860
Part Number	550-510K

Holley EFI CAN to USB Dongle Communication Cable
Compatible w/ Holley EFI, Sniper EFI, and Terminator X Software
Part# 558-443
$71.70
Qty:
Holley EFI Oxygen Sensor
Replacement Sniper and Terminator X O2 Sensor
Part# 554-155
$143.95
Qty:
Earl's Fuel Pressure Gauge Adapter
Earls - 1/8" NPT in Hex -6AN Male to -6AN Female
Part# AT100199ERL
$19.61
Qty:
Earl's -6 AN Male to 9/16"-18 (AN6) O-ring Port
Earls -6 AN Male to 9/16"-18 (AN6) O-ring Port
Part# AT985006ERL
$11.33
Qty:
Earl's Pressure Gauge
Oil-Filled - 0-100 PSI - 1/8" NPT Male Thread
Part# 100187ERL
$46.52
Qty:
Holley EFI Replacement Regulator Kit
Replacement Regulator Kit for EFI Regulators and Sniper EFI throttle bodies.
Part# 12-878
$25.82
Qty:
Sniper EFI Coolant Temperature Sensor:
Service Replacement Coolant Temperature Sensor
Part# 543-120
$30.70
Qty:
Throttle Position Sensor
Replacement TPS for Terminator and Sniper EFI Throttle Bodies as well as a variety of other Holley EFI Throttle Bodies.
Part# 543-111
$71.70
Qty:
Sniper EFI to Holley EFI Dual Sync Distributor Adapter Harness
SNIPER EFI TO HOLLEY DUAL SYNC HARNESS
Part# 558-493
$40.95
Qty:
Sniper EFI 3.5" Handheld Controller
SNIPER EFI 3.5 TOUCH SCREEN LCD
Part# 553-115
$348.95
Qty:
Sniper EFI Installation Kit
Sniper EFI Installation Kit
Part# 520-1
$41.35
Qty:
Earl's AN Port Plug - Hex Head
-6 AN Port Plug w/ O-Ring Seal, Black Anodized Aluminum - 2 pieces
Part# AT581406ERL
$8.23
Qty:
Sniper EFI Input/Output Harness
Input/Output Harness for Sniper EFI Systems
Part# 558-491
$56.32
Qty:
Sniper EFI Coil Driver Module
COIL DRIVER MODULE
Part# 556-150
$143.95
Qty:
Sniper TBI Main Harness
Main Battery Harness with Fuse and Fuel Pump Relay
Part# 558-490
$143.95
Qty:
Hooker BlackHeart Oxygen Sensor O2 Bung 3.0" Clamp-On Style
Oxygen Sensor O2 Bung 3" Clamp-On Style for all vehicles that utilize an Oxygen sensor
Part# 71014301-RHKR
$43.00
Qty:
Hooker BlackHeart Oxygen Sensor O2 Bung 2.5" Clamp-On Style
Hooker Blackheart Oxygen Sensor O2 Bung 2.5" Clamp-On style
Part# 71014302-RHKR
$43.00
Qty:
Hooker BlackHeart Oxygen Sensor O2 Bung 2.25" Clamp-On Style
Hooker Blackheart Oxygen Sensor O2 Bung 2.25" Clamp-On style
Part# 71014303-RHKR
$43.00
Qty:

This part is legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles.

The following vehicles are considered Uncontrolled (Non-Emissions Controlled) Vehicles:

1965 and older U.S. manufactured California Certified vehicles
1967 and older U.S. manufactured Federally Certified vehicles
1967 and older Foreign manufactured vehicle

WARNING: It is against the law to install this part on an Emissions Controlled Vehicle

The following vehicles are considered Emissions Controlled Vehicles:

1966 and newer U.S. manufactured California Certified vehicles
1968 and newer U.S. manufactured Federally Certified vehicles
1968 and newer Foreign manufactured vehicle

Quickstart Guide
Quickstart Guide

Instructions for Part# 550-510K
Instructions for Part# 550-510K

Holley EFI Dealers
Do you need a custom kit built for your application? Do you need a system installed and tuned? Click here to find the Holley EFI dealer in your area!

Sniper EFI SD Card Contents
Sniper EFI SD Card Contents

Instructions for Part# 550-510K

Quickstart Guide for Part# 550-510K

Wiring Instructions for Part# 550-510K

Troubleshooting Guide for Part#550-510K

Pump Instructions

Have a question about this product?

Question
When installing the Sniper EFI, does it matter as to which exhaust port that the O2 sensor goes into? Also, does the system have the ability to read from both sides at the same time?
By Robert P. on December 19, 2019
Answer
The ECU only has 1 oxygen sensor controller, so it can only detect one bank at a time. That being said, no it does not matter which side you place the sensor on. We recommend swapping the sensor from bank to bank during the initial startup/driving process, just to ensure both banks are consistent.
Helpful?
Question
will the holley sniper EFI work with a standard HEI distributor with a vacuum advance?
By Jason W. on July 15, 2019
Answer
Yes sir!
Helpful?

Reviews

4.8 out of 5 stars

5 star
88%
4 star
10%
3 star
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2 star
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Easy job!

By Brent P on February 13, 2018 | Verified Owner

Finished installing. I read the directions several times before I began. Very simple installation if you follow the directions. Unfortunately the throttle body is slightly taller than the Holley carb it replaced. This puts the air cleaner a little too close to the hood so I am waiting for a 1" drop base for the air cleaner. I did go through the programming and have run the car. I noticed that the throttle response is much quicker than with the carb. The base I ordered is supposed to be in tomorrow so I can get it on the road and complete the programming. I will leave a follow up review afterwards.

Sniper EFI Kit

By Jay M on February 13, 2018 | Verified Owner

Fantastic product! Installed the Kit in my restored 1977 Chevy C10 Suburban with a 454. Watched the video several times, read the instructions and BAM! I was amazed at the how easy the installation was. The install would have been about 5 hours (quicker next time), but had an overnight delay due to a visit to Summit Racing for a 1" Holley spacer and the optional in-line fuel pressure gauge. I couldn't believe how the engine started on the first crank and the digital monitor and sensors all came to life as designed...not a single glitch. Idle was smooth and consistent; throttle control was more responsive than my old QJ. I could not have asked for anything more (unless Holley wants to include the spacer in the kit). I highly recommend the Sniper EFI Kit.

Awesome EFI

By John H on February 13, 2018 | Verified Owner

I installed it on my 1986 Dodge Ram 360. It was easy to install didn't take any time at all to do. Runs better than the more expensive brands like MSD that friends of mine bought. Have told everyone I know to look in to buying one and showed them in my truck the performance is incredible. Thanks again Holley.

Even I can do it!

By Ron C on February 14, 2018 | Verified Owner

Installed, by myself, on my old Jeep truck in an afternoon, while enjoying a few beverages. Fired right up the first time. Not only does my engine run smoother and cleaner but, my mileage is nearly double what it used to be. (oversize carb installed by a previous owner) I will be installing another one on my crawler project truck, also.

Carburetor to EFI

By christopher l on February 14, 2018 | Verified Owner

It was time to up grade my 72 Chevy Blazer after stalling out climbing hills when off roading. The Holley Sniper EFI was a fairy easy install following the included instructions and online videos. The Blazer starts in seconds and no more raw fuel burning the eyes. It’s been all smiles driving the Blazer now.

Sniper with dual sync distributor

By Troy G on February 14, 2018

Put my sniper on a Chevy 350 and so far nothing but smooth sailing. The timing control is also pretty painless. The only con I can think of is that your dual sync + sniper setup has a lot of extra wires and they aren't arranged in a way that lends itself to a clean installation. Holley should redesign some of the harnesses and modules needed for my type of setup and make it more streamlined. The shop did a good job, the setup is just too ugly to make look good without going out and buying extra stuff to dress and cover the wires. The sniper may be plug and play the distributor is NOT.

Sniper EFI kit 550-551k

By Justin K on February 14, 2018 | Verified Owner

Installation of the kit itself was pretty easy. Initial set up and programming was a breeze. Setting the throttle position and response was a little difficult for me and the instructions didn't seem very clear, but that could just be my fault. The install video was much more helpful to me than the written instructions. If this works as well as I hope it does, I look forward to purchasing another for my 65 malibu.

69 C10 388 Small Block

By Auston A on February 15, 2018 | Verified Owner

Ditch the Carb

By steven v on February 15, 2018 | Verified Owner

This complete kit was very easy to install and tune. Throttle response is amazing and it made my ZZ4 come to life. I would recommend this kit to anyone!

Maintenance Manager

By David R on February 15, 2018 | Verified Owner

By David R. on February 15 2018 Verified Owner I installed my holly sniper kit on my 77 ford F150 with 460 engine. It has never run as good.Everything was complete and simple to install. I get better fuel mileage and more power.

Sniper kit

By derek o on February 15, 2018 | Verified Owner

Opened the box and found this kit is awesome it has everything and looks great. Instructions are super easy to follow and complete for all set-ups. Great product for the money car runs great after install.

Beautiful Kit!

By TJ L on February 15, 2018 | Verified Owner

Easy install! Does everything I need it to do on a SBC. Great response!

!967 Camaro SS 350 Awesome EFI

By John S on February 15, 2018 | Verified Owner

Excellent fit and finish. Instructions were pretty thorough and tech support on the product was awesome. Would definitely purchase again. Huge increase in throttle response and hesitations and vapor locks my Edlebrock 750 had. Its just like driving a different car now. I also investigated a Fast EFI System & I found that the Holley had more to offer for the price comparison. I do not know why I did not change out my contributor for a this Holley EFI system a long time ago. If any one is looking into a EFI system for their classic car, you do not have to look any further than the Holley System. So easy to program form the start. John Stormshak

Sniper EFI master kit

By Mayfield M on February 16, 2018

It took months to receive my master kit, but seems well worth the wait so far. I installed the Sniper system on my 72 Plymouth with a 400 big block. Installation went fairly smooth and didn't need to purchase a whole lot more that wasn't included in the kit. The car started up the very first try after installation was complete. Runs much better so far. Throttle response is much better, and also seem to get better mpg! I would definitely consider using this system again on another car.

Sniper efi

By Craig M on February 16, 2018 | Verified Owner

Couldn't be happier very easy to install program and drive. Starts right up idels great.

sniper master kit

By Brandon S on February 16, 2018 | Verified Owner

recently purchased the 550,511k kit from holley. Thought it was going to be a huge hassle to install, but thanks to holley detailed install instructions it turned out to be pretty easy to install. The hardest part of the install was the fact that my mustang did not come with a return line for the fuel. The second great thng about this system is how well the self tuning works, my car started up on the first time after the install. I would highly recommend this product, is simple to advanced tuning ability makes it great for everybody from someone just trying to get ride of a carb to someone doing advanced tuning for a street/strip car.

Love the product

By Jason B on February 16, 2018 | Verified Owner

I absolutely love it. The kit is great had all the parts that I needed for a quick and simple install of the system. I will be upgrading some of my other trucks with the sniper here in the next couple of months. The system works great at -40°F started every time!

Holley Sniper 408w

By Celedonio R on February 16, 2018 | Verified Owner

Purchase the master kit for Windsor 408. Everything needed was supplied I only had to purchase one fitting for my temperature sensor but other than that everything was there. I was impressed with the quality and how easy it was to install. Took about one day from start to finish with looks of breaks in. Between. Easy to set up would buy again.

1990 454SS

By Steven L on February 16, 2018 | Verified Owner

I installed this on my 1990 454SS silverado and it performs flawlessly. Great product with great instructions.

Sniper on 69 Olds 350

By Mark J on February 16, 2018 | Verified Owner

Used the Sniper Master Kit on my 69 Olds Cutlass 350. Worked out great, easy instructions everything I needed was in the kit. Only thing I did different from the kit was I ran steal fuel lines instead of just using the fuel hose provided in the kit. Car runs fantastic, no cold starting issues, notably more power and response. Have recommended it to several other car enthusiasts. Very fair price and would purchase again.

89 JAG XJS CONV

By carl b on February 17, 2018

Converted v12 to a BLUEPRINT 355 V8 carbureted. dyno at 450+ hp, 440 torque. Had major problems starting and running. Converted to the SNIPER EFI. End of problems, runs great,looks great plus more ????hp.

550-510K

By John J on February 19, 2018 | Verified Owner

I purchased a 550-510K Sniper for my CJ-7 350 Chevy short block. I’ve tried the old Projection 2 and various carbs, all with bad results. With my Sniper It runs great at any altitude, I live in Alpine Az. Which is at 8050 ft. Altitude. Even with 3.31 gears it runs strong. This is the best upgrade I have ever purchased. I would recommend the Sniper to anyone wishing to upgrade their fuel system. Also very easy to install . JJ Size Medium John M Jones PO box 514 Alpine AZ. 85920

Sniper kit

By Jack P on February 21, 2018 | Verified Owner

With the help of some youtube videos for fine tune (iac for idle), this setup works good. I installed it on my 66 FE390 Fairlane GT and have a hundred miles on it now. The engine runs smoother and has quick throttle response. My garage doesn't have the rich exhaust smell, nor the gas smell when I park my car in it.I did not use the MSD distributor features yet. I'll be upgrading the alternator from 1g to 3g soon to eliminate some voltage issues. It took a few days to complete the install, linkage mod, and tank mods, but it was well worth it so far.

Sniper on ‘78 F150

By Chris T on February 25, 2018 | Verified Owner

I have used OEM EFI on motors, and competitors after market EFI systems; but nothing can compare to the ease of installation of the Sniper system. I am very impressed with how complete the kit is and how close the wire and hose lengths were to what I needed. After installation I had very little waste. Only small issues with installation were that I had to convert the C6 transmission kick down to a Lokar cable and the 351M/C motors use a unique fuel pump mounting so I had to order a different block off plate. For those of us used to working on Fords this is normal. System went on quickly and fired right up and idled after the short setup. Truck runs better than it ever has and starts cold like a new car. Idle adjusts automatically for cold start and AC compressor. I love the new “Carburator Gold” color to keep a little of the nostalgic look! All in all very happy and will use on other projects. This changes the game and takes the worry and planning out of EFI on older vehicles or motor swaps on a budget. Have recommended to others in my club.

Holley EFI

By Ernesto P on March 7, 2018 | Verified Owner

Great product extremely pleased with the shipping speed and most importantly the product itself. Instructions are clear and easy to fallow. After install truck ran so much smoother and now I'm saving on gas as well!!!

Holley Sniper EFI Master Kit

By Dale J on March 8, 2018 | Verified Owner

We put this on our 1966 Mustang with the 289.So far so good. Very easy to install and it looks great.Holley should be proud of this one

Sniper on carburetored Ls 2 motor!!!!!!!!

By Dan E on March 23, 2018 | Verified Owner

I'm running a Ls2 carburetored motor with Brian Tooley stage 4 cam, ported and polished heads and intake by Kimm Barr in Garland, Texas. The head flow right at 300. Motor was a beast with a 950hp carb. I was concerned with the performance of the Sniper to run this motor. Surprise, way smoother idle,cruise, and rediculous throttle response. The only issue was getting the info to hook it up to the Ls based 6LS msd box. After I did my research, because holley kept saying the grey wire, I figured out it is the yellow wire out of the MSD 6LS box to trigger the tach iutput. Figured that out and bang, off and running. Very happy so far. Crazy but the idle sounds in no way as radical or, weird enough,loud. Much more quite ride. Got more to learn but a bad ass kit.

Dose not come with O2 sensor

By Richard Z on April 10, 2018

This kit dose come with O2 sensor you need to use ..for 1250.you think they would tell you ... And it's on back order 3 weeks out holly.com dose not state you need to buy sensor when calling Tec service. Also very bad customer service on hold for 20 mins transfers 3 times then back to teck service I hope the product works as advertised Rick

This kit is awesome!

By Spike S on June 7, 2018

Very easy to install, everything you need in the box, great instructions and the video is even better. Made my 455 Buick motor come to life. Great kit and great price

pump is 125 psi and the hose SAE 30R14 is maximum 50psi

By Robert E on September 30, 2018

first it looks perfect and compete the working we wil do it after the last event pump is 125 psi and the hose SAE 30R14 is maximum 50psi when the pump is max en the carb is blokking we think we need a other hose the r9 i like to no before we starting the rebuld from ouder 520hp ac cobra ok everything is ok now after some emails

Sniper EFI on brand new 383 in 1965 Satellite

By Paul P on October 2, 2018 | Verified Owner

I have had this car since 1972. It was a Chrysler Engineer car and upgraded with Road Runner suspension and factory traction bars. It is a console 4 speed car with a Richmond 430 posi in the rear. All is original except the trans. It is a slip yoke from a Road Runner. I saw the demo of the Sniper into a 67 Camaro and saw it was a 4 speed also. I decided to get away from dual quads and choke problems in different climates or seasons. Since everything is brand new on my car, I dropped the tank and installed a stainless return line. The installation was very simple, 4 wires. One each to battery pos and neg, one to the switched ignition and one to neg of coil. I am happy to say that even though I have a large cam and Pro Form electronic distributor, Yesterday, I turned the key and the car fired immediately. It idled and started to learn. Now to break it all in. Well worth the money considering the cost of multiple carbs and tuning them. Paul aka DOCMOPAR

Sniper Master Kit

By Shaun M on March 25, 2019

The core of this kit is great, the install is not as intimidating as it might seem; however the videos created by Holley and uploaded on this site misrepresent what is actually in the kit, be aware that you will not receive any throttle linkage components or connectors as stated. I am not sure at what point they stopped providing these parts in the kit it was just something I did not expect to chase down after getting into the install (Holley you should put some notes on your install videos indicating that the linkage parts / brackets and electrical connectors are no longer provided). Also depending on the vehicle you are installing my my case a 1972 Camaro; you will also need to source a cover plate and gasket for your old mechanical fuel pump removal and also a fuel return line; these things I was aware of going into the install. Also pre plan how you will mount the fuel pump and filters, these need to be mounted close to the fuel tank a lowest level and Holley can't solve that for you as every car is different; this was expected on my end just a heads up.

Brought my 460 back to life

By Cody K on May 26, 2019

Overall very happy with this kit, super easy to install. I does not come with any linkage for the throttle cable or trans kick down rod, also no fuel pump block off plate or electrical connectors that were mentioned in the install video. Once installed set up with the tuner was super easy and truck fired up on the first try. No issues with it at all yet.

Holley Sniper twin marine application

By nicholas h on May 27, 2019

So i was looking for a way to gain some range on my 33' Aquasport offshore fishing boat. I have a twin 350 mercruiser setup in my boat. I had a hard time getting them started cold and i only had a range of 75 miles and that was a big limitation. After this installation she starts like a car with better performance and I have increased my range by 25%-30%. the install was relatively easy other then a few issues with it being a marine application. The first and largest was the O2 sensor. I tried to install the bung in the topside of the pipe but this didn't work do to the exhaust pipe being to large i couldn't get enough flow fast enough at idle for a good reading. I was able to make a fitting to put the sensor in the manifold and this and slowing the closed loop reaction down solved the issues there. The other was to be sure the pump is mounted to the bottom of the tank for best performance. If you have any issues the first question techs will ask you is whats you fuel press? I mounted a holley mech. gauge on the inlet of the TB so I had a solid reading. I had one of the kits had the IAC motor fail but they sent me a new motor with no problems. The main challenge is getting it learned but once she has learned the table this is a awesome kit.

Fantastic kit but be prepared

By TJ B on July 25, 2019 | Verified Owner

I just finished installing this on my 84 bronco. I am by no means a mechanic, however I can turn a wrench. Took me two full days between trips to the parts store and trips to gather little things I needed. This is worth every penny. You will struggle. You will think of giving up but in the end this is fantastic could not give it any more praise. Great job Holley.

Impressive

By White R on January 31, 2020

I have installed the Fitech on a 49 Ford with a 302 and fought for a month to get it to run. The 2nd Fitech I installed was the 2X4 set up on a 29 Ford with a 454 and A blower. After many calls to fitech and 2 months of tuning I finally got it. Would NOT recommend Fitech. So I just installed the Holley sniper for the first time on a 29 Ford roadster truck with a 1956 Oldsmobile Rocket 324 engine. It was much easier to set up. Cycled the system till I got the fuel primed. Bumped the key and it fired right up. Super impressed and will be recommending these to all of our clients.

Jeep 4.6 stroker, now with Sniper EFI

By David S on July 25, 2020

I've had mine installed on my 1984 CJ7 with a 4.6 Newcomer Racing engine for about a year now. It runs so much better, and stronger than it did with the 390 carburetor that I took off it. I just purchased a Holley Hyperspark Distributor, CD box, and coil. This will be awesome!

Sniper EFI

By Don S on June 4, 2021 | Verified Owner

I bought this kit for my 65 Vette & was waiting for my new TKX 5 speed trans & my newly built 350 motor and my Flaming River rack & pinion set up, now that everything has arrived, I am about to install it all this week. I have a small (1 man) resto shop here in the Carolina's & wanted to have a demo car for my customers to drive to promote my shop. I have no doubt that the Holley kit was the way to go, it is complete & an easy install from all that I've read here & on other sites, thanks for the opportunity to express my opinion.

Best Decision Made

By Var G on June 4, 2021 | Verified Owner

I installed this kit on my 72 Chevelle w/ a 383 Stroker. The kit was easy to install. Instructions were easy to follow. I am running a 200-4r transmission, so I needed a new throttle & TV cable bracket (Demon Carb Bracket). The only other major extra purchase was some extra fuel line for my return. I could have used the extra provided, but the way I chose to route it I did not have enough. After completing the installation the car fired right up and idled perfectly. A few days later it was 13 degrees outside. Turned the key and it fired right up. Great product.

1984 K10 sniper

By Micheal C on June 4, 2021 | Verified Owner

I got the master kit and was very easy to install. I’m still dialing in the sniper. I wish it came with fuel pressure gauge and a tune for higher altitude as I live 7000 above sea level. I only have a 100 miles on it but has been good so far as this is my daily driver. I highly recommend this setup as it has almost everything you need.

Sniper 550-511K master kit with Hyperspark on a Buick 350

By Spencer R on June 5, 2021 | Verified Owner

Complete kit. The only things you will need to source is a new throttle cable, and modify your existing bracket or purchase a FITECH GM throttle cable adapter. You will also need a throttle return spring. Install was straightforward. Follow the quick-guide installation instructions. Use solder heat shrink connections only. Started up and ran great on first crank. Self tune works great, especially if you follow the Holley videos on TPS and IAC idle settings. I found that the EFIPRO throttle lever extender and progressive linkage together made the sniper much more streetable. It starts snd runs like a dream. Note: handheld is a little finicky. I strongly recommend downloading the sniper tuning program, and using the Holley software to tune your fuel and ignition curves.

Sniper efi 2 thumbs up

By Bill P on June 6, 2021 | Verified Owner

Installed this on my chevy 355 in my jeep and the throttle response is amazing!! After buying this I don't know that I'll ever buy another carburetor again! Love it!!

modified 360 mopar

By Brad W on June 8, 2021 | Verified Owner

Purchased master kit. Easy to install. Started first time. Easy to setup. Imprved idle and much better throttle response.

Better than the others

By James T on June 29, 2021

I have installed 3 EFI systems from another company F*t**h. They all had issues even on stock to mild engines and a pain to tune using there supplied handheld. Let me say the Sniper was similar in install for wiring and such so follow instruction with routing wires. Started 1971 Blazer up and only adjusted AFR and runs amazing. Pay the couple hundred more bucks and buy a product that works out of the box with out spending hours to days tuning. Two thumbs up Holley.

installed on 1983 camaro

By Jason H on July 29, 2021

installed the master kit on my camaro .. went pretty smooth .. just over 5 hours start to finish .. works great . engine didnt even rotate over 1 time before it fired..

Almost has everything

By James M on August 10, 2021

I like all the information the display provides, I like all the tuning options available. I like there are bolt holes for square bore and spread bore intakes. The only things that are missing from this system is a place to connect the Cruise control cable and a way to control the negative wires for overdrive solenoid.

Sniper EFI 1978 Chevy C10

By Victor S on December 10, 2021 | Verified Owner

This is one of the best purchases I could have made. Sniper is very easy to install and Holley provides detailed instructions on how to install it. My truck start every time I go to start it. I am hoping to install this on my 1973 Ford Mustang Mach 1 as well.

Sniper on Buick 350 is awesome

By Doug M on December 22, 2021

Installation was easy. Had a little more to do since I had to replace a leaky fuel tank. I took that opportunity to get one one with an in tank pump for EFI and ran new stainless steel fuel lines instead of using the supplied hose. The hardest part of the Sniper install was neatly bundling the wires. The quick install instructions are easy to follow and the setup for the engine was amazingly simple. After programming and cycling the ignition the engine started on the first revolution. The only adjustment I had to make was for idle as the mechanical stop had the throttle open to about 1600 rpm. Once adjusted for proper IAC engine dropped into a perfect idle. Since I replaced a 2bbl Rochester with the 4bbl Sniper and a stage 1 intake manifold from TA Performance, I expected not only the EFI convenience and reliability, I expected a slight increase in performance. I was wrong. I got a LOT of increase in performance. Suddenly there was a beast under the hood. I am having a hard time not mashing the skinny pedal and keeping that silly grin off my face. At present I have just been letting the Sniper auto-tune itself and it seems to be doing fine as fuel mileage has been increasing, temperatures are stable and it just feels smoother and smoother.

The EFI is great buttttt....

By Cody B on April 23, 2022 | Verified Owner

I purchased my Sniper EFI kit not too long ago and just recently had it professionally installed. The product is fantastic and the engine fires right up, however the electric fuel pump is ungodly loud. It was installed properly and on the rubber grommets but it didn't help. You can hear the pump from down the street (yes down the street). YouTube some videos on the noise it makes before purchasing and make sure you're okay with the sound. I promise it isn't something you can just drown out. Other than that the product works great!

Sniper Kit

By Jacob M on September 21, 2022 | Verified Owner

Ok, so if you are wondering is it worth the money, YES, will it work like they say, YES. Will the stand behind it if it has problems 1000% yes. I own 4 sets of these, and out of the 4 one of them one has had an issue 2 different times. The first time Holley took it back and worked on it and sent it to me, and about 6 months later started having a problem again, now keep in mind this is like 2 plus years after I bought it. After I sent it back the 2nd time they ran test and said that they were just going to send me a new replacement, WAIT WHAT! Sure enough, they did, I WILL ONLY BUY HOLLEY PARTS FROM HERE ON OUT. If they are going to stand behind their stuff like that, WHOA I am in. Even before this, I would go to car shows and tell people to buy and they would love it, I love it, hit the key and it fires right up and runs amazing. I am also that guy that read reviews to see if it is worth but never seem to write one, but I have to make sure people know that this is one great product and that Holley stands behind it a 1000%.

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