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Atomic EFI Throttle Body Injection, Basic Kit
Atomic EFI Throttle Body Injection, Basic Kit

Atomic EFI Throttle Body Injection, Basic Kit

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Atomic EFI Throttle Body Injection, Basic Kit
Atomic EFI Throttle Body Injection, Basic Kit
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Part # 5472910
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HolleyDAYS are here again! SAVE up to 20% on this part and hundreds of other Holley brands during the 2018 HolleyDAYS sale 11/15/18-12/31/18.

Install Saturday Morning, Make the Cruise Saturday Night with the Atomic Basic kit. The Atomic EFI outshines the competition in ease of installation and performance! The MSD annular ring injection design produces an air/fuel charge with much better mixture as well as an even distribution among the cylinders that the competition cannot match. Better AFRs equal better idle quality, better starting, and better overall drivability throughout the rpm range. You and your engine will be glad when you Go Atomic.

If your vehicle already has an electric fuel pump with a return line in place, you might not need to replace it. If this situation fits your car, you may want to consider this Basic Throttle Body Kit which comes with the Throttle Body, Power Module (with Wide Band O2 sensor), and Handheld Controller.

  • Bolts to standard 4 barrel intake manifold
  • 8 wire connection installation
  • Replaces standard square bore carburetor
  • Controls ignition timing
  • Integrated ECU and sensors
  • Single fuel line
  • Self-Tuning
  • No Laptop required
  • 5472910 Atomic EFI TBI Instructions (PDF)


The Atomic EFI was designed to bolt on to any square bore, 4-barrel intake. This includes common 4150 and 4160 designs. These intakes can be found on countless engines for muscle cars and hot rods including small and big blocks by Ford, Chevy, and Mopar. There are even aftermarket intake manifolds to convert LS engines.


Note:  For an existing fuel system to work with the Atomic, we recommend the system be able to maintain 42psi constant and use 3/8th or “Dash 6” fuel line rated for EFI. The Atomic can support a return fuel line if needed for your application.

The Atomic EFI throttle body is actually so much more than a throttle body! Check out all the callouts on the graphic Atomic EFI Features to see how this throttle body is easier to use.

Compare Atomic EFI to the other popular EFI conversions EFI Systems Comparison.

Atomic EFI Quick Start Guide (Link)

See how to install the Atomic EFI on an inline 6 cylinder by reading "4WD Mechanix Magazine's" tech article MSD Atomic EFI: Jeep 4.2L Inline Six 'How-to' Retrofit! 

Still have questions about the Atomic EFI Conversion? See Frequently Asked Questions for the Atomic EFI System.

Some parts are not legal for use in California or other states with similar laws/regulations

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    The Toolbox is Speedway Motors' hub for professionally written articles.

  • Now that Project Chevelle is making some real power, we've decided to ditch the old tank, lines, and pump in favor of a new tank and pump from Tanks Inc.

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