Parts Bin: Edelbrock Pro-Flo 4 Electronic Fuel Injection Systems

Most common types of electronic fuel injection (EFI) conversion kits rely on a single throttle body to deliver fuel into the intake manifold—very much like a traditional carburetor.

But a lot of modern engines use something called multi-port fuel injection (MPFI) in which multiple injectors are used, often placed further downstream in the manifold, directly ahead of the intake valve.

That’s because MPFI systems produce better fuel atomization and distribution than a conventional throttle body-injection system, resulting in improved performance and efficiency.

Which is why Edelbrock’s Pro-Flo 4 EFI Systems caught our attention.

The Pro-Flo 4 uses a carbureted-style intake manifold and throttle body like most aftermarket EFI systems do, but it’s actually an MPFI system—complete with fuel rails and eight injectors mounted on the manifold.

Fuel delivery is timed with the intake valve opening and delivered into the airflow stream right before it enters the combustion chamber. The throttle body is for air delivery only.


Instead of feeding the fuel into the throttle body, the Pro-Flo 4 system delivers it to individual injectors housed in the intake manifold. (Image/Summit Racing)

The Pro-Flo 4’s self-learning ECU features a faster processor and an upgraded Bluetooth chip that is faster, more reliable and will not drop connection.

It’s easy to use thanks to Edelbrock’s free E-Tuner app that connects to the ECU via Bluetooth. That allows you to adjust air-fuel ratios, ignition curve, idle speed, acceleration fuel, cooling fans, rev limiter, and other parameters using an Android-based smartphone or tablet.

The E-Tuner comes with dyno-tested baseline calibrations and an easy-to-use setup wizard to get you started.

You can get your Pro-Flo 4 system with or without a tablet with the E-Tuner app already installed.

The Edelbrock Pro-Flo 4 comes with these components:

• Fully assembled intake manifold with air valve, fuel rails, and injectors
• Fully assembled, OEM high-quality wiring harness with pre-terminated connectors and labeled connections
• Wideband oxygen sensor
• Distributor
• Gaskets and hardware

You also have a choice of Edelbrock fuel systems to feed your Pro-Flo 4:

• Return-style fuel systems are ideal for any vehicle where you can mount the fuel pump in a location lower than the fuel tank. They can handle higher-horsepower engines and come with a fuel pressure regulator so you can adjust fuel pressure for optimum performance.

• The sump-style fuel system doesn’t require running a return fuel line back to the tank. It works with your existing mechanical or electric fuel pump and can support up to 600 horsepower.

You can get Pro-Flow 4 systems for a lot of popular applications, including GM LS, small/big block Chevy, Ford Windsor, Ford 390-228 FE, Pontiac 326-455, and small/big block RB Chrysler.

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  1. Tom Jarrett says:

    I currently have a Pro flow 3500, first type from Edelbrock. I have had problems with this system and when I call tech support the answer is always the same. Can;t help you with your problem because your system is too old and no one here is familiar with it. They want to try to sell me a new system and I am not going for it. Can you tell me, will the newer systems use some of the same parts used on a 3500 systems so I am not buying the same parts over again. I have noticed quite a few pro flow systems on ebay, maybe that tells me this system is not the best.

    • OnAllCylinders Staff says:

      Hey Tom, we reached out to our contacts at Edelbrock and they told us that they’re working on an upgrade kit for some of the older systems.
      At this point in the development, they couldn’t share exact details on which systems the upgrade kit will be compatible with. If we hear any more news, we’ll be sure to share it here.

      • OnAllCylinders Staff says:

        Got another update for you Tom, straight from Edelbrock:

        “We are finalizing a kit which will allow All legacy Pro-Flo kits to be upgraded to the new Pro Flo 4 self-learning system.
        It will require some new hard parts and sensors along with new ECU and full wiring harness, the cost of this upgrade is being finalized.
        All needed components will be included in the upgrade kit.
        Doing the upgrade the customer will retain their current manifold, injectors, fuel rails, and most sensors. The upgrade will include a distributor, wide band O2, upgraded IAC & adaptor, Upgraded ECU (Pro-Flo 4), Complete wiring harness, Android Tablet, and any associated parts/hardware needed to make this conversion.
        After which the customer will have a fully self-learning sequential multi port system just like the new Pro-Flo 4.”

  2. MASTERMECH48 says:

    I would look at the interchangeability of the electronics from OTHER systems.

  3. rick wallace says:

    Wow Vic , its nice to see you have such an expanded applications available including 30 to 40 different small Chevy 20 or so big bow ties and LOTs or Ford small block and even 2 for my ole boat anchor FE (one with and one without a tablet for $100 diff) ( Vic probably gets `em for $12.95 each from china and pays some kid 5 buck to program it. But, again I say BUT, none for the stump pulling Chevy eating 385 series Fords!! ( 429/460 for you none Ford blue bloods ) None I say , Why? That motor is far more popular today than an old 390 or 428!!! Why do you not make available to use die hard blue bloods? Give us a way to have all our holes running the same A/F ratio with your multi-port design. Is because it isn`t branded 18436572? Or is it because you cant get enough fuel stuffed in her that she wants to make 900 ponies. Please let us know when and if your gonna , and quit serving those dead horse BOP folks. ( why would you put this kind of money into olds or poncho. did they ever get 500 hp out of one of those things and not create an oil slick right at the 499 point?

  4. Dennis Harris says:

    500 miles on my 440 Mopar with Pro Flo 4. Amazing transformation. Car is easy to drive, performs well. Cold, warm, and full op temperature starts and restarts perfect. Best upgrade ever.

    • Benedict Grimm says:

      Did it Increase your MPG? Because here in Germany we pay like 6€ per Gallon… Love my procharged 2003 Silverado but thinking about something older

  5. francine rodino says:

    Please if you can I am in need of your email address. I am a member of the daytona beach street rods car club. I would like to send a message about our turkey rod run.

  6. Benjamin West says:

    What fuel psi does this system require?

  7. Benjamin West says:

    What fuel psi is required?

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