I decided to run a 4150 carb on my combo for more street ability. Has anybody ran one of the 1050/4150 carbs against a smaller carb or a dominator? Do they make good power? I'm sure a dommy would make more top end hp but how much am I leaving on the table?

Running huge carbs seems to be all the rage these days, so I won't even try and talk you out of it.

I'll just say that my one experience with one...... A qft-q1050......On a roller cammed, Indy headed 572....... was good.
It made a few more hp than a Mighty Demon 850.

Did a 1050 annular for a friend and his SB Chevy made 620 peak w/the annular and only 6 more peak w/Pettis's house 1050 dommy FWIW but I think it is a 3-circuit and a 2 would be better on this combo and most for that matter.........

I have a nice QF 1050-AN carb that makes good power. It gives up a little bit to the Dominator but some of that could be due to the intake manifold. Are you going to run an adapter on your M1 4500 or are you going to switch intake manifolds?

Have you run the Dominator yet? That was a three circuit correct? It will be a lot more streetable if you just plug the intermediate circuit and run it as a two circuit. The intermediate circuit doesn't work on a street car since it goes super rich at part throttle.

If you plug the intermediate circuit and get the Dominator jetted correctly it will run on the street. Use a power valve and lean out the main jets. You'll also want to run plenty of ignition advance. If you do that the Dominator should work okay.

I ran a 1050 AN on my 511 on a tm6. Pretty much mirrored the performance of my six pack using a 4412 center. I was able to dial the 1050 in to run really great at cruise and actually get better mileage than the six pack. Both setups ran 10.90's through mufflers at 4000# race weight. I really like my 1050.

Andy I'm currently running the m1 4500 that I got from you but it's up for sale. I am running a 750 Holley with adapter until the new carb shows up.

Fwiw, whenever I dynoed anything with the 4150/4500 adapter "upside down", the results were never great.

Fast68,
That is good to know thank you. I was curious about that. I plan to get a victor or trick flow Intake, but have a old tm6 that would work for now as well.

I had a Prosystems 1000 with the metering blocks and squirters setup like a 1050, and it was awesome. And against a 1050 4500 Thumper carb, it was .08 slower in ET and almost 2mph slower overall. I would highly recommend the newer 1050 model he has and a Thumper tune or I can give you mine. Do not do annular 1050 4150.

I ordered the pro form 67305 which is down leg boosters 1050. I don't know what the actual cfm is. I hope it's close ootb like my last pro form carburetor.

Unless its a blowthrough.

My CNC Edelbrock Victor MW headed 511 low deck made 750hp with a 4150 QuickFuel 1050AN. I didn't test it with a Dominator or our tunnel ram because we were focused on the nitrous stuff.

I'm very curious to see what it does with t-ram and two 1050AN's. The solid roller that Mr. Jones specced was for heavy, small tire stick street/strip ala Dragweek car with the t-ram. It wasn't optimized for nitrous however we did use hellfire rings.

To be honest I was kin d of disappointed, the 511 sounds like a 509 cammed 440 lol.

I'm with ya there although I never tested it personally, I've seen some guys say it works but my logic sez how could it.........These were NOS guys but still, a clean n/a signal and tune equates to a clean NOS pass all things being equal...........

I run a 4150 style carb since I don't have intake gaskets for my 4500 intake.... and I don't want to ruin the ones that are presently on it. Have plenty of fun going 9.4's 9.5's....

A few like 3 or 30?

While I don't have experience with 4500 carbs, I recently went from a downleg 830 to an annular 1000 HP 4150. Right out of the box with only jetting and idle mixture adjustments, my 451 ran noticably crisper on the street with better throttle response and gained 2 tenths at the track.

It's notable that I changed the fuel delivery system at the same time, going from 5/16 to 1/2 line, and adding an auxiliary electric pump.

CLASSIC Jay

I run a 4150 with a BLP BX4 main body on 434, BLP said it was 1050-1100 cfm.

It was about 5hp.

.028" in Venturi diameter is only going to get you so much.

BLP has an "interesting" way of flow-testing their carburetors: "Carburetors are Dry Air Flow tested at 20.4” on a SuperFlow SF-1200 FlowCom flow bench using a 2” open hole spacer."

Ever look at their flow ratings for significantly different carb sizes? Straight from their web site:
- "750" 4150 w/ 1.405" Venturi 1.688" = 1030 CFM
- "850" 4150 w/ 1.590" Venturi 1.750" = 1060 CFM
- "950" 4150 w/ 1.405" Venturi 1.750" = 1060 CFM

I suspect when you flow test carbs on a 2" open spacer that you're going to see less sensitivity to venturi & throttle size changes. If they were tested where the actual flow exiting the carburetor was isolated & measured (i.e., not dumped into a 2"-tall plenum first), the differences would be more apparent, and the max flow #s wouldn't be as high, either.