Buyer's Guides / Parts

Edelbrock 1406 vs. 1906 Carb Comparo

It’s the Edelbrock 1406 Performer carburetor versus the Edelbrock 1906 AVS carburetor.

We’re not pitting these two carbs against each other because they’re mortal enemies (they’re from the same family, for goodness sake), but because they are two very good and very popular options among classic auto owners.

But which is right for your ride? And how do they stack up head-to-head?

Let’s find out:

Edelbrock 1406

Along with some of the Holley offerings, the Edelbrock 1406 is the quintessential 4-barrel carburetor for street performance.

The 600 cfm 1406 is designed to handle the rigors of day-to-day driving while delivering consistent, reliable street performance. They’re hand-built and precisely tuned — and they’re designed to hold that tune. The venturi booster uses a bottom-feed design for smoother acceleration and better drivability. The overall calibration of the carb will stay consistent and unchanged, so you can always expect optimum performance on the street.

Let’s look at some of the important features, starting with the metering rods. Edelbrock utilizes these metering rods to transition between circuits, which means the carburetor is unaffected by engine backfires. There are no power valves to blow out, and the rods can be changed in seconds without removing the carb from the engine or draining the fuel.

Other features of the 1406 include a lightweight, all-aluminum body with a two-piece body that resists warping. It uses simple tub-type bowls and rear-pivot floats, which make the carburetor reliable and user-friendly. It also has an electric choke, mechanical secondaries, and a square bore flange.

It’s also worth noting that the 1406 is extremely reliable and maintenance-free. There are no gaskets below the fuel bowl level for fewer leaks, and no plastic parts or power valves to blow out.

Edelbrock 1906

Edelbrock took its years of carburetor research, development, and tuning experience — including what it’s learned from the 1406 — and used it to create the 1906, also known as the AVS2 Series carburetor.

This means the 1906 offers improved calibration that’s designed for optimum street performance in a wide variety of small cubic-inch, as well as some big block engines! This calibration is achieved through annular flow boosters, which deliver improved off-idle and cruising performance. These boosters incorporate eight, equally spaced orifices to improve fuel metering from idle to the main circuit. It also provides better fuel atomization to eliminate flat spots which may occur when transitioning from idle to full throttle.

Other features of this 650 cfm carburetor include an electric choke, mechanical secondaries, adjustable secondary air valves, and dual fuel inlets. 

1406 vs. 1906 Head to Head

If you’re still having a hard time understanding the differences, here is a head-to-head comparison of features:

Booster Type-Annular
Height3.250 in.3.250 in.
Fuel InletSingleDual
Primary Jet Size-101
Secondary Jet Size-98
Secondary TypeMechanicalMechanical
Throttle LinkageUniversalUniversal
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  1. I have a 1957 chevy truck that I have put
    A 327 with old school 300 horse heads on.
    Has small cam just to give it a good sound.
    No headers and no alum. Intake. I just
    Pleasure drive and take to shows. That has the 1406. Runs out good does super for me.
    Starts good when cold. Not sure I could find anything that would work as well or better for me.
    1406 you got my vote.

  2. Karilynn Yarbrough says:

    Hi, I have a 1987 Ford E350 chassis motorhome, it has the 460 v8 with c6 tranny. Ive been doing some basic troubleshooting for an extreme loss of power with backfiring under the hood, always on big hills but also seemingly random occurrences during flat city type driving. Oh yeah, I also only get 3mpg!! I started basic with an oil change, replaced plugs & wires and a couple of perforated hoses but was waiting on my air filter to get here to spray the carb with some cleaner. I finally got it, removed the air cleaner & got the surprise of my life! I had been operating on the assumption that I had the Holley 4bbl, but where that should have been was instead a beautiful, (mostly) shiny Edelbrock! Unfortunately though, I’m not sure which one it is. I think it’s either the 1406 or 1906 but I can only look at it from the front where the hoses are attached. Is there any way for me to determine which one it is from that side? I really appreciate your help!!

  3. Can I put an avs2 Annular boosters into a 1406 carb? I’m uninterested in upgrading from the single fuel inlet in the stock 1406 booster venturies.

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