MSD Ignition MSD 2900 Atomic EFI Master Kit (525HP Max)
121-2900
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Items You Need
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Atomic EFI Fuel Injection Kits
The master kit includes every component you need to complete an EFI conversion.CARB E.O Number D-722Includes: Throttle body Power module Wide band 02 sensor Handheld programmer Fuel pump kit which includes: Fuel pump (good to 525 hp) Filters Brackets High pressure hose and clamps
Specifications:
Part Type
Engine Make/Size
Universal V8
Engine Make/Size
Universal V6
Engine Make/Size
Universal V4
Cylinder Head Type
Standard
Quantity
Sold as a kit
Calibration Module Included
Yes
Distributor Included
No
ECM Included
Yes
EGR
Without EGR
Fuel Pressure Regulator Included
No
Fuel Pump Included
Yes
Fuel Rails Included
Yes
Injection Style
Throttle body
Injectors Included
Yes
Intake Manifold Included
No
IAC Motor Included
Yes
IAT Sensor Included
Yes
MAP Sensor Included
Yes
Oxygen Sensor Included
Yes
Throttle Body Included
Yes
TPS Sensor Included
Yes
Wiring Harness Included
Yes
Metering Style
Speed density
Injector Size (lbs./hr.)
80
Throttle Body Mounting Flange
4-barrel square bore
CARB EO Number
D-722 (pdf)
Manufacturer's Part Number:
2900
Shipping Weight:
16.35
Package Height:
8.8
Package Depth:
10.2
Package Width:
21.2
Part Category:
Performance Parts
Part Fitment:
Semi Universal
2900 - MSD Atomic EFI is rated
out of
5 by
13.
Rated 5 out of
5
by
Mike8 from
Great power adder
This kit is nothing short of amazing. It came with everything needed to convert my 1970 pickup into an EFI truck. It’s never ran better or sounded better.
Date published: 2021-10-27
Rated 5 out of
5
by
Wrenchman from
Car seams to run better
I installed this 2 weeks ago , only have a little over 100 miles it's still learning and so am I . I added the fuel damper , now just need to get the idle down a bit . It has gone crazy fast to insanely fast .
Date published: 2019-04-28
Rated 5 out of
5
by
Snickelfritz80 from
Couldn't be happier
I bought this to replace a carburetor on a 77 Thunderbird (400 engine) that i didn't want to mess with anymore, and it was the best choice I could have made, (over a new carburetor). It starts on hot days, and cold days and idles perfectly. There was a massive power increase that I never got with a carburetor. I have been using this car daily for work for almost a year now and has yet to let me down. All questions I had, the instructions answered. I have it set up as advertised, (non return style) and have had no issues other than it needs 92 octane or above or it doesn't run very well. I will be buying more of the atomic EFI setups for my other project cars. Even convinced my dad to get one he liked it so much!!
Date published: 2018-10-20
Rated 5 out of
5
by
ThermoBear from
So good I'm going to buy it twice
I recently installed this unit on my 1962 GMC pickup with the original 305ci V6 engine. The kit installed so easily it was like it wanted to be there. After tinkering with the A/F Ratio settings and other parameters, my truck is running better than I thought it could. That old engine used to run out of steam around 60mph (probably because I could never get it tuned right with a carburetor) and now it cruises right up to 100mph before I even realize it. The kit is so good, I'm going to buy one for my 1968 Impala.
Date published: 2015-09-18
Rated 5 out of
5
by
Maresd from
Excellent system
The atomic EFI system is excellent and I am very pleased at how easy it was to install.I just finished installing the system and it runs great.All I have left is to drive it and a few detailing items.I think I will be very happy once I am totally finished.I am already happy with the way it starts in cold weather.With a carburetor I had starting problems and I was not happy with it.Can't say enough about this system.Thanks.
Date published: 2015-02-15
Rated 4 out of
5
by
Ken Cox from
Not quite finished, but soon!
The only reason I don't give this a 5-star is because the information available when I was researching it differs somewhat from the details in the instructions. It wasn't until I started to do the installation that I found out the system needs either a return line, or an in-tank mounted fuel pump. I'm not doing either, and am hoping for the best. Engine is a basically stock Ford 390, so the demand is low. We'll see how it runs once the install is complete.
Date published: 2022-05-10
Rated 4 out of
5
by
Kikazz from
Atomic
Replaced carb with the MSD Atomic ego. 350 engine runs really good now. 8 out of 10. Nice unit.
Date published: 2019-10-05
Rated 4 out of
5
by
rrobins from
Good product but pricey
First let me say this is a well-made product easy setup plug and play system. That being said the major reason for buying this over the other competitor’s EFI systems is purely compatibility with the other MSD items I have on my truck. My 383 is street able @ a little over 500hp but if you’re thinking of building up from 650hp and over forget it. MSD will not handle it now but wait with technology changing they’ll build something to keep up. Again good made product but to pricey for the HP. Shop for the EFI that meets your needs there are less expensive ones. And I bought this from Jegs because SUM&^# customer service stinks.
Date published: 2016-01-09
Is this system compatible with a 150hp Nitrous Express Mainline nitrous system?
The MSD 121-2900 TBI kit is compatible with wet nitrous kits.
Date published: 2022-12-24
I have an MSD 8529 ready to run distributor with a vacuum do I need to change that out to Sintra fickle advance distributor or is there something I can do with my distributor to use it. Also can I use the MSD 6A on the system.
This distributor will work with the Atomic kit.
Date published: 2018-07-20
Does this Kit plug into my 6AL box and Distributer
This kit will connect with the wiring from your distributor.
Date published: 2018-06-13
I have an 82 K5 Blazer with full smog appliances (Cali Car). With this being a CARB legal kit, what can I eliminate off the manifold? Lots of vacuum hoses to the carb, EGR valve etc.
If you want to remain California legal you would need to retain all those items
Date published: 2017-12-29
Im building a 355 sbc and im gonna be right at about 12-1 compression and id like to be anle to run 91 octane but to do so i have to reduce the timimg will i be able to use this product as well as the MSD 6AL-2 ignition box to do that with out issues?
Yes, this unit will allow you to control the timing and the fuel injection pulse width.
Date published: 2017-12-22
Will this kit work on a 1979 Ford F-250 6.6Lt 400cid? The engine has an Edelbrock performer intake, mild street/strip cam, MSD 6AL controller and MSD distributor w/o vacuum advance.
Yes the MSD Atomic system will work on your motor.
Date published: 2017-12-13
Plan on building a 5.3l ls engine and running the carb intake with msd controller box. I will have a 700r4 trans behind it and more than likely put it in a 92 chevy c 1500. I like the simple wiring and did not want to cut and splice wires all day.
Hello,
If you are asking if this will work with that app, yes it will work with that 5.3.
Date published: 2019-12-06
Will this system work with a 1977 Chevy stock 454? And which MSD distributor is recommended to work with this system and my engine?
This system would be compatible with your vehicle. An MSD 8360 distributor would also be needed.
Date published: 2017-11-09
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.