I am curious as to what is the biggest 4150 based carb available in true CFM not inflated or misleading hype.

When I was looking the QF 1050 and this Holley had the venturi size, I went with the Holley. Great carb!
https://www.summitracing.com/parts/hly-0-80805hbx/overview/

Thats what provoked my question and what started it all was several years ago when it came out that the Holley HP 950 was closer to 850 cfm. I see carbs rated at 1050 but wonder how many of them really are and that includes Holley.

Biggest single carb is made by Pto Systems,the SV1 can flow over 2500 CFM.

http://www.prosystemsracing.com/svseries.html

The original Holley # 80496 950 CFM rated didn't flow close to that number, I had several of them flowed, they all flow under 900 CFM
I haven't had any of the newer Holley HP flowed but I believe when Quicf Fuel came out with their version of the HP type carbs that did flow as advertised Holley had to keep up
The early HP carbs., including the HP950, worked great out of the box, including the replacement HP Dominator carbs. with the smooth tops
Not all the Holley race carbs. work great out of the box, same as other brands like Barry Grant, Carters and Edlebrocks

interesting in the linked ad for the Holley there is no mention of venturi or throttle plate size. I would think that would make a difference in how much air it would allow to flow. Braswell B-4825 Series carburetor is offered with venturi sizes from 1.40" up through 1.68", and throttle bores of 1.688", 1.750", or 1.790. Mine happens to have a 1.48 venturi/1.79 throttle bore. I don't have a 4500 intake fitted to my W8 so I bought a 4825 to play with in the mean time.

The “linked ad” is just the summit page. Go to Holleys website. It’s got all the specs.

The Quick fuel P series... P1050 flowed 1050
link to picture
https://imgur.com/a/VcnLb

I agree, I was just showing you what worked for me. Bit like said its super carb, ran it on the dyno first and only had to set the floats and adjust the idle.......👍

One more thing, my cam has 274/285 @ 050 duration and with this carb I got a clean idle @ 900 rpm and that's something my 850 could not do.

Wow , that makes you wonder whether like you one of these may be an easier option than a 4500 carb . Save over adapters or more intakes .
What is the ball park $

Tex

I ran a 1000cfm AED on the Arrow for years. Last year I had some issues with it and put my old Ray Murray 850 back on....saw no changes other than I was going rounds again lol

not sure new.... I picked mine up of Racingjunk. Like I said, I was just looking for something to use as all I had was my BG 750. I should throw that on again one day and see how it runs compared. I only did that once when the combo was brand new. I did put an adapter on it and ran our 4500 1050 on once occasion. Didn't 60 as hard and ran a bit slower due to that. Was an 1/8th mile track though. Maybe top end on a 1/4 track would have shown some improvement. Of course every combo is different. Mines limited by a rather mild camshaft.

If you look at the venturi and throttle bore diameter for both a 4500 and 4150 "1050" it will be readily apparent they aren't going to flow the same.

Not a 4150..........The BLP billet 1.610 bore 4150's flow 1040+ and the oval blade stuff I hear flows gobs more but never messed w/one yet. When in doubt go Dominator.............

Yep. Mr. Smoke meet Mr. Mirrors... they can't BOTH flow 1050 CFM at the same test pressure.

At least one big-name racing carburetor builder doesn't even give a CFM rating the last I heard: Braswell. It's all about venturi size, throttle plate size, and booster style.

Here's a question for you: Which of the following flows the most? They're ALL 4150 carbs with 1.75" throttle plates.

1. BG Demon RS 1.425 venturi & downleg boosters

2. BG Gold Claw 1.500 venturi & downleg boosters

3. QFT/Proform 1.45 venturi & downleg boosters

4. QFT/Proform 1.52 venturi & downleg boosters

5. QFT/Proform 1.59 venturi & annular boosters

6. Holley Ultra 1.58 venturi & downleg boosters

7. Holley Ultra 1.60 venturi & annular boosters


The answer: It doesn't matter.

What does matter is which carb works the best on the track with a particular combination... at least, IMO.

^ i'd guess the 1.58 venturi with downleg booster would flow the most.

but for any motor i'd build i'd probably want 1.45 or 1.52 venturi with annular booster...

Get that flow bench put back together and you can answer that question

Annulars shouldn't be necessary on a carb with venturi that small.

Annular boosters are a bigger obstruction to air flow, which is why most successful applications using annulars that I've seen have been on 1.56" & larger venturi. All those small(er)-venturi annular carbs that Quick Fuel offers make no sense to me...

Better than I get the MoPig back together so that I can answer the more important question: How many of my seven (7) carburetors can I sell once I figure out which one(s) work the best ON THE CAR?

I got waaaaayyyy too much $$$ tied up in those things.

Well, the answer to how many is easy....... 5 or 6........depending if you can get the quickest one to be adequately street friendly or not.

The harder question to answer will be....... Which one or two to keep?