Carburetors: Biggest, Baddest & Best Part 4

 

Dom 1

In the last three segments of our series, we took a detailed look at Holley’s Gen 3 Dominator. They’re an impressive carburetor, but we’re not quite done yet. Check out the following:

Not mentioned elsewhere is the surface finish on the Gen 3 Dominator carbs. They’re available in what Holley calls, “Hardcore Gray”. This isn’t just a surface finish on the main body and bowls to sell parts. Instead, it’s a hard coat anodizing. The idea here is to keep the carburetor looking good for an extended period of time. It is cool though in that it contrasts nicely with the black anodized metering blocks. By the way, the big carburetors are also available with a polished body with your choice of a red or black anodized aluminum components (metering blocks, boosters, bowl fuel fittings, etc.). Each of the finishes is covered by a separate part number.

 Note the big “windows” in the bowls.  The days of unscrewing a gasketed sight plug are over -- now you can peer right into the bowl to set the fuel level.  By the way, each side of the bowl is equipped with a sight plug.
Note the big “windows” in the bowls. The days of unscrewing a gasketed sight plug are over — now you can peer right into the bowl to set the fuel level. By the way, each side of the bowl is equipped with a sight plug.

 

When it comes to the bowls, the actual fuel capacity has been increased by 20%. Obviously, the extra volume reduces the chance of fuel starvation. When you take a closer look at the bowls (see the accompanying images) you can see a unique “shelf” situated below the needle and seat. What this does is to minimize fuel aeration. Additionally, a special trough has been built into the bowl. The purpose is to direct fuel to the jets. Certainly, this trough keeps the jets covered, but it what it does is to stabilize the air fuel ratios. The bowls are also baffled internally. The idea here is to keep fuel slosh to a minimum when you get on the throttle. Also included is a set of new secondary jet extensions. Unlike earlier screw-in versions, these new extensions are brass sleeves that simply slip over the jet.

The fuel bowl inlet fittings are now -8 to -6 in size (-8 at the bowl, -6 at the male fitting).  This eliminates the special Holley thread once used on bowl fittings.  And by the way, the fuel lines can be plumbed from either side of the carburetor (the same as Dominators of old).
The fuel bowl inlet fittings are now -8 to -6 in size (-8 at the bowl, -6 at the male fitting). This eliminates the special Holley thread once used on bowl fittings. And by the way, the fuel lines can be plumbed from either side of the carburetor (the same as Dominators of old).

 

Externally, the bowls are equipped with huge see-through windows that make for easy float settings. Bowl inlets are machined in 8AN (o-ringed). This makes plumbing easy, and like earlier examples, the bowls are threaded and tapped on either side. Holley includes AN plugs on one end of each bowl along a -6 AN to -8AN fitting on the opposite end. One incredibly good feature is a new, easy-to-access drain port on each bowl (it’s obvious here the folks from Holley were paying attention to racers).

 This is a simple but brilliant idea.  Holley designed a simple, easy to use bowl drain on each of the fuel bowls.
This is a simple but brilliant idea. Holley designed a simple, easy to use bowl drain on each of the fuel bowls.

 

Big CFM Dominators include dual 50cc accelerator pumps. Like all earlier 50cc setups, the accelerator pump cams are replaceable and tunable. You’ll too that the pump shooters have a new screw (to fasten them in place). Holley even took the time to think about the screw and how it can affect airflow across the carb. Because of that, the newest Dominators incorporate a smooth profile button head shooter screw.

Upstairs, Holley even spent time working with airflow around the shooter screws. Given the careful airflow management, the shooter screws are now smooth profile button head jobs.
Upstairs, Holley even spent time working with airflow around the shooter screws. Given the careful airflow management, the shooter screws are now smooth profile button head jobs.

There’s more too: In order to keep up with today’s electronics (data acquisition, throttle stops, etc.), a throttle position sensor mount is featured on every main body. FYI, Holley also notes that the TPS setup can also be used for a computer controlled transmission (for example, any of the electronic late model Turbo Hydramatic overdrives). Holley offers a throttle position sensor separately — P/N 534-214. With this setup, the TPS simply attaches to the body of the Dominator by way of a couple of screws. There are three wires to hook up:

• Blue = Output Wire
• Black = Ground
• Grey = +5 Volt Reference

As you can easily see, the latest Gen 3 Dominators are totally modern. They offer huge advances over earlier models and it’s clear they offer massive amounts of tuning capability. To make it sweeter, the new big Holley’s are simple to tune too. “Biggest, Baddest & Best”? No question. See the accompanying pix for details.

Source: “BIGGEST, BADDEST & BEST!”

Holley Performance Products
1801 Russellville Road
P.O. Box 10360
Bowling Green, KY 42101-7360
Website: www.holley.com
PH# 270-782-2900

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