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Holley 550-510K

Sniper EFI Master Kit with Shiny Finish

Holley 550-510K


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Holley 550-510K Sniper EFI Master Kit with Shiny Finish $1,249.95
Sniper EFI Master Kit
  • Sniper Self-Tuning Shiny Throttle Body
  • 3.5" Touch Screen
  • Fuel System Kit

  • Holley 550-510K Details

    EFI Self-Tuning Kits



    • Bolt on carburetor replacement (designed to fit single & dual carb manifolds)
    • Throttle body mounted ECU - no extra boxes to mount
    • Supports up to 650hp
    • 4 wire vehicle connection (Battery +, Battery - , Switched Ignition & RPM)
    • Includes complete fuel system consisting of; 20ft of 3/8" Vapor Guard Fuel Hose, 12-920 Fuel Pump, Filters, necessary hardware and bulkhead fitting to return fuel into the tank.
    • Integrated fuel pressure regulator
    • Integrated ignition timing control & coil driver
    • Color touchscreen for setup and gauge views
    • Calibration Wizard NO laptop required for this self-tuning ECU
    • The included Wideband Oxygen Sensor provides real-time fuel map learn.

    Note: If using a Holley Dual Sync distributor, adapter harness p/n 510-558-493 is required to connect to the Sniper EFI.


    Manufacturer's Part Number:

    The Holley Sniper EFI Self-Tuning Kits feature all the benefits of EFI, a perfect option for street cars, muscle cars and off road vehicles. Eliminate typical carburetor cold starting issues, hesitations, flooding and vapor lock. Sniper EFI four fuel injector kits can support up to 650HP. The Self-Tuning ECU makes it an easy, no hassle way to get the most performance out of your vehicle without a laptop computer. With available shiny, black ceramic, or classic bronze throttle body finishes, the Sniper EFI kit also brings style under the hood.

     JEGS Easy Kits are designed by JEGS high performance racing professionals to help you get all the performance parts you need for your race car, hot rod or truck.

    550-510K is rated 4.4 out of 5 by 5.
    Rated 5 out of 5 by from Great addition At the price point of these new systems, there's no reason not to switch to EFI these days. Driveability and throttle response has improved tenfold. A slight 'slurping' sound similar to the rear barrels opening on a vacuum actuated carb that is more prevalent than on the carb but I kinda think it's a cool sound (let's you know that its sucking that ait and powering up) and frankly its a small price to pay. I suspect it's the air drawing through the smaller venturi opening. Maybe Holley fixes it going forward, maybe they don't. I'd be fine either way. My worried about noise from the fuel pump were unfounded; can't hear a thing. Great, great product. So THAT'S what a 383 is supposed to feel like? Here I thought 'cranky V8 that can't run cooler than 180 degrees' was the best I could do. Nope - this thing feels like a modern performance engine now.
    Date published: 2017-06-30
    Rated 5 out of 5 by from Big performance increase to our 454! We did not think it would make that much of a difference to our 454 but the power increase is amazing! Starts so much easier also. Installation was a little involved as we were putting this on a 68 impala and had to run a return gas line to the tank. Other than that installation wasn't too bad. Holley will provide great help you if you call them also.
    Date published: 2017-05-29
    Rated 5 out of 5 by from Sniper Install I bought this unit and gas tank for my 67 Mustang. The car has a 428CI FE, 10.5-1 compression and has always been a bear to start when cold. It would just turn over, cough etc for several minutes. Just finished the install and the car fired right up away. Didn't even have to hit the gas pedal. After fighting with this for many years it was great to have it fire up right away. Wished I had done it earlier. But it is still winter here and have not had the chance to put some miles on it will have to wait until spring.
    Date published: 2017-02-14
    Rated 4 out of 5 by from Nice EFI Nice unit east to install except i was missing a couple fuel fittings. I called up Jegs and they made it right.
    Date published: 2018-04-18
    Rated 3 out of 5 by from Easy install and made a huge difference in driveability. It does have a flaw and I was very disappointed with Holleys answer. When accelerating, at the point the rear butterflys start to open and they stick. It takes extra throttle pressure then the engine surges. What is happening is vacuum is causing rear butterflys to stick requiring extra throttle pressure. I called Holley and was told they are aware of the problem, there is no fix and quite frankly had the attitude of "Oh Well" They said try different configurations with the throttle and that might help. There are blogs out there with this problem but this is a design flaw and quite frankly a safety concern. This is not Jeg's fault.
    Date published: 2018-04-08
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    Will this fit a Ford 312 engine?

    Asked by: fratchj
    These kits are made to fit almost any engine. As long as you have a 4150 carb flange this EFI unit can be configured to work for you.
    Answered by: Flanary
    Date published: 2018-05-17

    What is the filter neck height and can this system be used with capacitive discharge ignition 

    Asked by: Rob76400
    It is a standard carburetor size 5 1/8". this can be used with a CD ignition.
    Answered by: Rusty B
    Date published: 2018-02-28

    Parts needed to in a sniper efi on a stock 1977 ford f250 with a 460 automatic transmission.

    Asked by: Bo 2018
    This should work on your truck, you may need to re-use some of the linkage components from you carburetor for the transmission.
    Answered by: Rusty B
    Date published: 2018-02-26

    In one of the questions your answer says the EFI systems operates at approximately 58 psi. However, it appears that the fuel pump sold on Jegs operate at less than 58 psi and most are measured by a GPH unit. What fuel pump do you recommend?

    Asked by: clint01310
    Holley recommends the use of their 12-920 . These are the specs for the fuel pump; 80 gph @ 15 psi/67 gph @ 45 psi 480 pph @ 15 psi/402 pph @ 45 psi 5 amps @ 15 psi/8 amps @ 45 psi Supports TBI up to 800 HP
    Answered by: Rusty B
    Date published: 2018-03-08

    Can I run this with existing mechanical fuel pump, or do I have to use an electric fuel pump? Thanks.

    Asked by: RE from Miami
    The Sniper EFI systems are designed for an operating pressure of 58.5 PSI. An electric fuel pump is ideal and recommended to accomplish this. Carbureted engines with a mechanical fuel pump typically run between 5-7 psi.
    Answered by: Tech Support
    Date published: 2017-12-28

    Is this a blow Thur , is it capable of being used with a power adder, turbo, procharger ?

    Asked by: Duger
    This is not for use with power adder such as turbo or superchargers.
    Answered by: Jegs Tech
    Date published: 2017-10-18

    Can this system run e85?

    Asked by: krown
    the system can be run with e85 but it is said that due to injector efficiency it can reduce your power up to 30% Thanks
    Answered by: Troy Jr
    Date published: 2017-08-21
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    Items You Need
    Some parts are not legal for use in California or other states with similar laws / regulations