Holley 550-510 Sniper EFI Self-Tuning Kit with Shiny Finish
510-550-510
Product Q&A
View Now
Click image to zoom
Items You Need
JEGS 50022 - Air Cleaner with Logo 14 in. x 3 in. [Chrome-Plated]
$37.34
MSD Ignition 6415 - 6EFI Ignition Control Universal
$259.95
Holley 120-510 - 120-510 Sniper EFI Air Cleaner Drop Base
$36.17
Holley 120-511 - 120-511 Sniper EFI Air Cleaner Drop Base
$27.30
Holley 20-2 - Throttle Linkage Ball Studs Kit Contains The Following: 1/4", 5/16", 7/32" & 3/8" Studs
$19.61
| Ratings |
|---|
| Price |
| Brand |
EFI Self-Tuning Kits
Holley 550-510 Sniper EFI Self-Tuning Kit with Shiny Finish Features:
Note: If using a Holley Dual Sync distributor, adapter harness p/n 510-558-493 is required to connect to the Sniper EFI.
- For Troubleshooting Tips setting up your New Holley Sniper EFI System, please see this helpful video from Holley Performance.
Specifications:
Part Type
Product Line
Package Depth
9.30
Package Height
12.40
Package Width
14.40
Part Category
Performance Parts
Part Fitment
Semi Universal
Power Adder Compatible
No
Self Tuning
No
Shipping Weight
12.10
Timing Control Compatible
No
User Tunable
No
Vendor Part Number
550-510
550-510 is rated
out of
5 by
13.
Rated 5 out of
5
by
Kris from
Installed and fired and learned on the first try
I wanted to write a review, I had absolutely no problems, install was a breeze if you have electrical experience you won’t have any problems. If I had to do it again I would keep my mechanical pump and then run the high pressure sump in the engine compartment. This is the easiest way as you can run fuel line and return line to the sump and not the tank. Research your choices, I did a single plane, the Holley ignition stuff so the efi can have more control. It works perfectly
Date published: 2022-07-21
Rated 4 out of
5
by
Rich from
Runs great and leaked right out the box
Runs great after fixing the bad oring on the drivers rear injector.
Date published: 2023-02-05
Rated 2 out of
5
by
SR66 from
Affordable EFI - Could be better
One would think the Holley Sniper is a perfect upgrade to a carburetor. It maybe depending on what your expectations are. I received 2 defective units that would never sync up to the ECU and my final 3rd Sniper finally did work.
My experience with the Holley Sniper -
PROS
- Fairly simple straight forward installation and decent instruction manual.
- Setup includes just about everything needed to get it up and working.
- Solid build quality and appearance.
CONS
- Unit is noisy. During operation it emits a rather noticeable loud clacking / clicking racket. Apparently this is the injectors and or regulator. Unfortunately I could still hear it inside the car.
- Before starting the car you must wait 2.5 seconds for the pump to prime the Sniper in the ON position. Then you can turn the key to RUN. If you don't do this the car won't start and then it usually floods which takes awhile to recover. The 2.5 sec wait may sound like a short time but actually it seems like forever. If you are used to jumping in and starting right up you will not like this inconvenience.
- 2 fuel lines and pump. If you are upgrading to an EFI system you already know you need a send and return line as well as a higher output pump. Beware of your pump selection. I went with an intank Walbro pump and it was obnoxiously loud. Combine that with the clicking Sniper and it was unbearable.
CONCLUSION
As I stated before depending on your expectations the Holley Sniper may work for your situation. Performance wise throttle response was a bit sharper but overall the Sniper did not run any better than a well tuned carburetor. For me it was a disappointment and letdown in what I thought I was getting. I was used to my quiet running carburetor and inline electric pump. The Holley Sniper was too noisy and inconvenient for me. Add the ridiculously loud pump to the mix and it was a deal breaker. I went back to my carburetor and couldn't be happier. Others maybe be able to overlook these issues with the Sniper as well as find a quieter pump to work with it. Hopefully this review will give an informed decision before attempting the EFI upgrade.
Date published: 2017-03-06
Rated 1 out of
5
by
Cudanick from
Holley Garbage!
Right out of the box this unit didn’t work properly! Could not get unit to idle down to 800rpm. Finally when I got it to idle properly I drove my car 5 miles and while sitting at a stoplight the idle would jump to 1100rpm. Called Holley tech at least 6 times and even they were perplexed and couldn’t figure out the problem. I asked for another sniper unit and they refused. I eventually gave up and removed the sniper and installed a carburetor. Engine is now a happy camper. $1,000 dollars out the window! Thanks Holley! Bottom line? Technology is not as good as one would think. It’s great when it works but when it breaks down it is a total pain to troubleshoot and fix!!!
Date published: 2020-06-20
Rated 1 out of
5
by
c10guy from
1964 c10 with 454
I had this prof installed and it been a problem ever since...replaced the throttle body once under warranty and the ECM too..
I want to throw it in the trash and go back to my edelbrock 750 carb..
Date published: 2017-12-10
Rated 1 out of
5
by
Timber from
Ecu problems
Ecu would never connect. Kept saying searching for Ecu. Sent it back two times to Holley and they said there is nothing wrong with the unit. All connects were solid and wires tested a positive connection on my end. This turned into a three month ordeal with no luck. I am done with Holley. I will try the msd atomic next.
Date published: 2017-09-18
I want to run a regulator near the tank instead of a fuel return line from the throttle body. Can you plug the return on this unit and not use the internal regulator?
The Holley 510-550-510 tbi must be used with its existing regulator.
Date published: 2023-10-15
My engine will be sitting at 620hp with no power adders. Can I add nitrous (250 shot) on to this system? Is the system compatible with "stacked power"?
This should work in your application. The additional power is coming from the nitrous so you don't need to flow more air to make power.
Date published: 2023-01-12
Can this system be used with the stock 98 Chevy 1500 fuel pump?
This will depend on your fuel system, this will work with most high pressure EFI fuel pumps.
Date published: 2023-07-08
Can I keep my Holley Blue fuel pump with this set up?
The blue pump is not compatible with the Sniper set up.
Date published: 2018-07-05
Do they have larger CFM models like 850 CFM or 1050 CFM? Do they have marine applications. Can these be used with 871 blower?
These can be used with a blower, these are the only sizes currently available from Holley.
Date published: 2018-01-22
Is this CA smog legal?
The only company that makes retrofit EFI with CARB legality is the MSD with their Atomic EFI.
Date published: 2024-04-03
I have a tci ecu ez trans controller ... will the tps sensor be capable??
Some parts are not legal for use in California or other states with similar laws / regulations
Motor Vehicles
WARNING: Motor vehicles contain fuel, oils and fluids, battery posts, terminals and related accessories which contain lead and lead compounds and other chemicals known to the State of California to cause cancer, birth defects and other reproductive harm. These chemicals are found in vehicles, vehicle parts and accessories, both new and as replacements. When being serviced, these vehicles generate used oil, waste fluids, grease, fumes and particulates, all known to the State of California to cause cancer, birth defects, and reproductive harm.
Tools:
WARNING: Some dust created by power sanding, sawing, grinding, drilling, and other construction activities contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Some examples of these chemicals are: lead from lead-based paints, crystalline silica from bricks and cement and other masonry products, and arsenic and chromium from chemically treated lumber. Your risk from exposure to these chemicals varies, depending on how often you do this type of work. To reduce your exposure, work in a well-ventilated area and with approved safety equipment, such as dust masks that are specially designed to filter out microscopic particles.
Electrical Cords
WARNING: The wires of these products contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling.