Custom carburetion: going beyond
the basic four barrel

Supercharger carburetion

This is a dual inline IDF downdraft system, and it typically comes standard with the same velocity stacks shown on the carburetors below, on the 4-71 setup.

The adapter on all units is supplied in the standard "milled" finish, and can be polished as shown. Standard carburetor finish is the natural cast finish. Shown here are chromed carburetors, which is an available option.

This setup will fit on any large-size blower, from a 6-71 and up.

IDF, Downdraft, 48IDA Downdraft, and DCOE Sidedraft Systems

Same setup as above, with an optional Hilborn-style scoop. Each unit is built on a custom-machined adapter plate; just specify the blower you have.

These units come to you completely assembled as you see here, ready for startup, and they are available with an unlimited choice of custom finishing options.

Shown here is an optional satin black finish with chrome hardware package.

With this system, both carburetors are linked together, and all four barrels operate at the same time.

This is another twin IDF blower system, but with the carburetors turned 90 degrees to face forward on a smaller 4-71 GMC supercharger.

Braided stainless fuel lines, stainless case liquid filled pressure gauge, and regulator with fittings (not shown) are included with all carburetor packages.

This one is shown in the basic plain finish, with an optional cable bracket in brushed stainless steel.

This style also features progressive linkage. The rear carburetor is the primary two-barrel; the secondaries come in with the front carburetor.

Height with the 2-3/4" stacks, as shown, is 8-1/4" above the blower.

Built for Ron Sturgis in VA, for a 4-71 on his flathead.

Dual Inline IDF Downdraft with carburetors shown in optional satin black finish.

All supercharger carburetion systems come fully assembled and ready to run and are individually tailored to match your engine and its intended use. All carburetors are genuine Weber.

Custom finishes are optional. Each unit includes linkage, low-pressure fuel regulator and fuel fittings, braidess s.s. fuel line, liquid-filled stainless-housing fuel pressure gauge, and a supercharger base gasket. Instructions are included for adjustment and to familiarize you with all parts of these carburetors, along with exploded views to help you identify the carburetor components.

These carburetors are extremely easy to adjust, and once they're dialed-in, will require virtually ZERO maintenance.

Ordering :

Please call to place your order by telephone. At that time, a 50% deposit is taken on the major credit card of your choice. The balance will be automatically charged to the same credit card (unless you specify otherwise) when the unit assembeld for you. PLEASE NOTE THAT NO CHECKS ARE ACCEPTED. Credit card, money orders, or money wires only.

(Click on any of the images for blowups)

Dual Inline IDF Downdraft with optional chrome plated carburetors.

Front-facing IDF's
for 4-71 supercharger

8-pack for blowers:

If your supercharger is a larger type, you have room for a 4-carb unit like this one. This is (4) 40 IDF's, and it operates on eight barrels, which can be progressive or all direct...your choice. Either way, they work great.


Shown in the basic plain finish, with all chrome hardware and Russell Endura fuel fittings.

This one is going on a mid-60's Corvette. Owner is Brian Hedgerton of New York.

Brian will be the first to tell anybody he's thrilled with the performance of this 4 carb unit. It makes amazing power.

Quad IDF Downdraft for large blower

The twin DCOE's are right at home on either a 4-barrel intake or a supercharger, as you see here.

This is a specially built unit in blue basecoat / clearcoat with all chrome hardware and Russell Endura fittings.

Progressive lingage can be seen in the front.

The twin DCOE system is a very exciting way to get beyond 4-barrel boredom.

You will have lots of people asking you about it, so if you don't like talking to people, don't order this.


Built for Perry Adams, New York.

Twin DCOE on a
4-71 Supercharger

For those who appreciate the Weber 48IDA for its size and massive appearance, this twin downdraft unit is extremely impressive and can be made to have a very vertical look.

The 48IDA is the "Big Daddy" of Weber carburetion, and you will not see them set up like this very often. I offer this layout with two types of adapters.

This package can be ordered with the 6-1/2" velocity stacks seen here, and can also include a set of polished risers to give it even more height, also shown, if height is what you're after.

This unit is typically supplied on the adapter seen on the preceding page (Four Barrel Replacements page). The one you see here is build on a special billet adapter to the customer's order.

This is a design that's perfect for getting the carburetors way up over the cowl when maximum height and visual impact are the goals.

On the other style adapter, which mounts this unit to any four-barrel intake manifold or supercharger, the cost runs about $3000 for one built like this.

Twin 48IDA Downdraft for supercharger

Here are four 48IDA's built for a large supercharger, with 6-1/2" stacks, on risers, with a tall, polished billet adpater. A unit like this will add about $5800 to the cost of your project, but you don't see engines like this showing up at every car event either. Built for Jim Savalle, Connecticut.

4x48IDA Downdraft for supercharger

The 48IDA's