W9 Best 4150 size carb?

For a 440ci W9 small block that revs to around 7800, what size carb? I can tell you, its bigger than 950, but curious what others have run.

Time for you to find out Enjoy

I don't think i would run anything smaller than a dominator.

My little 408 loves it’s 1000cfm carb but I only shift at 6700 rpm.

I use to run a 1050, turning 7000. Worked perfectly.

Do you know how much power it makes? If you know how much power then you can do a rough conversion to CFM.

The power is deceiving as its all over the map right now....Tough to get a good idea of what its going to do.

On my 434 I run a BLP BX4 1.59" venturi 4150 main body that I sent to Dom, He added all BLP parts to it, according to BLP its 1050-1100 cfm. I'm only running Indy heads, no W9's.

Bigger the better.
Have yet to put a bigger carb on any smallblock I have ever had, and not picked up.

Dominator from your favorite manufacture

We run a carb with a 2.45" throttle plate on the Vette with is a good amount smaller than your engine is. Bigger for all out race stuff is usually the better option. As for how big that depends on the combo and power. If I were "stuck"on a 4150 type carb I would look at the BLP stuff or get Em Garage twin blades. I run a twin blade on the B1

So it might not be too outlandish to try my 1250 Dominator on it....Maybe knock some of the squirterr out of it.

Does your intake have a dominator flange?

No, his intake is 4150....I have a 2" and 1" tall 4500 adapters....

When I built my 434 Brett told me that I needed a dominator, but my intake has a 4150 flange. He told me to run the 4150 and not a Dominator on an adapter.

Here's a formula if you care to try the mathmatical way...

The formula for calculating how much CFM (cubic feet per minute) your engine requires is: CFM = Cubic Inches x RPM x Volumetric Efficiency ÷ 3456


OR

I've had several 4150 intakes changed over to 4500 bolt patterns to use Dominator carbs on

The N/A CFM calculator is accurate for a V8* (assuming a single plane manifold) in that it gives the result of the formula.
So, of course, that's true whether the manifold is "hood clearance" height, or tunnel ram, since no correction is made for plenum volume.
* For 1, 2, 3, 4, 5 or 6 cylinder engines the demand is slightly higher.

It also assumes that the 4 bbl. carburetor is designed to operate accurately with a working vacuum of 1.5 Hg" (1 & 2 bbl. are rated at 3.0 Hg"). A carburetor’s CFM rating is only accurate if your individual engine produces the rated vacuum with that carburetor. If not, the carburetor flows a different volume, and is therefore somewhat self-adjusting.
An engine will draw more CFM that its rating from a carburetor smaller than the traditional calculations (viz., a 440" V8 with a 500 AFB will not completely “run out of steam”), and less CFM than its rating from a carburetor larger than the traditional calculations (viz., a 1050 Holley on a 300" V8 will flow less than 1050 CFM).
If the carburetor's vacuum in service falls below 1.5 Hg. the booster and venturi system timing is disturbed, and the emulsion function (A:F curve with rising RPM) will change, generally becoming leaner.

Dominator.....

When I seen W9 and 4150 I was like, nope.

I’d try this…..

My 405 incher loved a 1050 dominator , and is fairly tame at 12.85:1 and 665 lift.
All in by 7000 , but more carb always picked it up in two days on the pump.

I would second that motion...

I agree 100% with Jay on the intake...

I think that is the intake they have or very similar, but with a 4150 flange....I gave him an adapter for a 4500 he might try a 1050 on it next week.

That intake is made by Brett Miller and only comes as a 4500....