Holley 4150 VS 4500 Throwdown of the 750 CFM CARBS Is the Dominator the King?

[@Robs-Garage-experiments]

Dang! ALLSTATE CARBURETOR! I used to live close to that shop. There very good at what they do.

[@UnityMotorSportsGarage]

Yes they are and great to work with I buy all of my Gaskets, Jets, Bleeds, plus they modify/build carbs.. Andy

[@mikes.1882]

The forty one fifties are gonna work better.I think they'll be less fuel Fall out between the carburetor and the head, With the 4150's. What springs on the pumps? Which boosters. Dog leg? I would. Cubic inches ÷ 2 carbs. Dog leg boosters

[@tedjones-ho2zk]

Your viewers will come out on top, with the knowlege that you provide from your channel.

[@UnityMotorSportsGarage]

Thanks for the kind words! Andy

[@rolandtamaccio3285]

When I was with Jenkins in '71 his tried and true setup was two 660's with the last lower inch of the main body opened up for 850 baseplates . Holley , Weiand , Bauman , Mopar and one or two Hemi teams had sorted the Dominators about a year and a half earlier , and they won 90 plus percent of the major Pro Stock races in '71 . So of course Holley wanted Dominators on the top Chevy , which was a 430 inch big block , and we worked very hard to comply . When we finally got the manifold and big carbs sorted , we stayed right where we were with the 660's , and didn't close the gap on the Hemis which was about a tenth of a second . Soooo, we built a small block Vega ,,, ! ,,, Btw , of course the little carbs had a much bigger plenum ,,, ! ,, ,,, I rated the 660's at a nominal 700 CFM ,,, and we initially used the 1050 CFM Dominators , but had the 1150's , and maybe used them first . It's only been 53 years .

[@UnityMotorSportsGarage]

Roland I'm so glad you posted.. can you please email your info again to [e-mail] I would love to talk with you and maybe have you on for a live chat Andy

[@twatdidusay304]

​@@UnityMotorSportsGaragehave you checked out the "carb cheater" that Thunderhead289 came up with? That might be something fun to play around with.

[@bigboreracing356]

@@twatdidusay304 Buy one and tell us how it works.

[@4speed3pedals]

When I get a new carb, it will be a 750 Edelbrock VRS. It has the bells and whistles that Holley does not, right out of the box. Annular venturi is the ticket.

[@UnityMotorSportsGarage]

The VRS carbs are a game changer! I can't wait to try them as well.. Stay Tuned Andy

[@bluecollarcook]

Edelbrock for the win!

[@UnityMotorSportsGarage]

😆

[@mikasantos3774]

Ive been using widebands for the last 12 years never will tune a car without them

[@UnityMotorSportsGarage]

I'm with you, although I will say it made plug reading easier because I could actually see and correlate the AFR to the color of the plug Andy

[@shacklifecustoms8430]

Good for you real men don’t need em never did

[@outlawbillionairez9780]

This will be interesting,Andy! I'm not familiar with the Dominators, so it's school time for me!

[@droppedf100]

I’d be curious to see a change in vacuum wot between the 2 sets of carbs.

[@UnityMotorSportsGarage]

Me too! That is going to be telling Andy

[@mikedeal8659]

“Why use a dominator? Because they look cool”. Best line ever. Great tech tip for the O2 sensors. Looking forward to the carb tuning !

[@TonysHotRodGarage]

Wideband is indeed a game changer when it comes to tuning. I'm slowly gaining on mine LOL. I'll be following this one closely that's for sure.

[@UnityMotorSportsGarage]

Tony, it sure is! Thanks for watching and the support brother! Andy

[@lukesimeon5756]

Great test can’t wait thanks

[@thebegrsshow]

Is there a reason why you haven't hooked up your crankcase breathers to your header collectors yet?

[@UnityMotorSportsGarage]

It doesn't work on the street! At the track I didn't notice a gain. Good question! I need to cover that in a video Andy

[@skymit5519]

Please do a video on this Andy! Love your work. This is what I’ve been waiting for. Carb stuff!

[@skymit5519]

And the crankcase breathers 😉

[@bobwhite4344]

looking forward to your upcoming vids.

[@UnityMotorSportsGarage]

Thanks Bob! Andy

[@v8packard]

I think the annular boosters in the Dominators will atomize more finely than the downleg boosters in the 4150, given the same signal. Because of that, response might be crisp with the Dominator. However, the finely atomized mixture will take more room, physically, in the intake tract. And that will result in slightly lower VE at wide open throttle for the Dominators compared to the 4150s. That could give the edge to the 4150s at the track and on the dyno, despite the Dominators having better drivability. Just a crazy thought, I could be totally wrong.

[@danbuchner1494]

Kool i cant wait till the next one i have a brand new 750 Dominator and have been reluctant to try it My 422 cube small block Mopar made 535 hp with a 750 xp i am going to try the Dominator after your videos

[@johnudon8537]

I'm going with the dominator's coming out on top!

[@UnityMotorSportsGarage]

I really don't know... I think the 4150's will drive better and launch harder in the first 60' but that is just a guess. Andy

[@RoyMiller-d8y]

I believe this is going to be a very revealing project. I'll be tuned in on it.

[@UnityMotorSportsGarage]

Thanks Roy! I believe it will be interesting to see the results Andy

[@servediocylinderheads]

We need to use them on Mission Impossible! Tunnel Ram Mafia!!!! With 675's! Yes!

[@bigboreracing356]

I currently have a Street Tunnel Ram on MISSION IMPOSSIBLE FOXBODY Got leaking head gaskets tho so no test hits as of now.

[@servediocylinderheads]

@bigboreracing356 I had alot of issues holding head gaskets in a hot 5.0l. Finish was mill heads, deck block, HD head gaskets, torque to yield head bolts.

[@bigboreracing356]

@@servediocylinderheads My issue is a F2 ProCharger/Nitrous if needed on a GM 502 Marine block. Quicker cars force me to turn up the wick to keep from getting gapped. Got a o ringed Big M Block and copper gaskets to seal better. I apologize for what I said yesterday. I have very low SI Why did you use torque to yeild bolts on a race engine? Did ARP not have anything available?

[@kraschsclassics]

I'd have to go with the Dominator. The annular boosters allow leaner mixtures for street driving. I'm going to guess not much HP difference due to the intake limiting total flow.

[@UnityMotorSportsGarage]

And that is why we test... What if it was the carbs all along? Andy

[@maxhorner2409]

Use of o2 sensors will definitely help dial in fuel to air ratio. Most shops used to have a machine they could hook to car all analog with o2 sensor at tailpipe dwell meter Anda few other things fer routine tune up

[@broz1969]

Agree 100%. 02 sensors are the only way to really tune a carb. You can get close with the seat of the pants evaluations, but the sensors really let you know where you should lean out or richen up the individual the circuits. I'm interested to see the results. My guess, they will be within about 10hp. But the dominator will get the edge.

[@christopherc3017]

I can’t wait. I’m decent at rebuilding and turning quadrajets and Holley. Can’t wait for you to help me level up my carb skills. I can only learn so much from reading it helps to have advice on it. Saying things like I’m using a vacuum gauge to tune my carb sounds like crazy talk at local parts house.

[@jcnewbee8124]

I have a wide band on my car and only use it on the street, on the track the carb is completely set up different. I would like to see a single 850 on that.

[@UnityMotorSportsGarage]

JC how come you don't use it down track? Curious Andy

[@jcnewbee8124]

@@UnityMotorSportsGarage I tune everything on the car to the 330 clocks...if its fast there its fast everywhere.

[@thedobermangang3503]

You do some pretty good videos my brother.. I learn a lot from you let me say this I've been through about 6 carburetors to run right. So I went with a fitech efi my engine is running better but I am still in the process of still tuning it.

[@codywallace9322]

Great video! I just got my 395 sbf from the machine shop where it made a little over 600 hp. I accidentally got a dominator intake manifold. Can a dominator work on a drag/drive foxbody? This is my first carbureted set up

[@davelewis2174]

The cfm being the same the differance in boosters annular vs steped down leg is a coin toss

[@UnityMotorSportsGarage]

It will be very interesting as I have NEVER seen this test done, I'm probably the only one crazy enough to do it. 😆 Andy

[@TaekwondoFitForLife]

Very cool, one of the “Wizards Of Tunnel Ram Flow Technology.” Love this, because you and David Visard, are guru’s of the velocities needed for proper fuel throttling and idle for The Tunnel Ram Intake. So cool and absolutely when to use oxygen sensors? When you are so dam good that it gets down to that kind-of fine tuning. And absolutely yes on carburetors. So cool, I watch youAndy and UTG David Visard and a few others. You guys are so cool😊

[@gregh6794]

Really looking forward to seeing this Andy. Will be interesting. Overall power I think the Dominators will be on top :) I love my Dominators , I found the 2 circuit 1050 best for street

[@GMCOldsRichmond]

I’m mostly a GM guy, but love your truck dude.

[@UnityMotorSportsGarage]

Thanks so much that means alot! Andy

[@rotaxtwin]

I agree with your thinking, without a wide band O2 sensor you are working blind. Very difficult to set up a carb for optimum results by seat of the pants testing. Those nw HP 4150s are dead sexy BTW... very nice. Looking forward to it.

[@davidreed6070]

I don't mean to be smart or anything, but I think your intake is costing you a consideral power loss.look at the Gain the gasket mismatch did. Thats telling me the air is hauling but in the intake.

[@UnityMotorSportsGarage]

That is being addressed later as well.I already have the other intake ready to party one step at a time lol Andy

[@marksarkaquariums9056]

Awesome idea Andy.I'm betting that the 750's will perform better at the track.They may or may not make the most HP on the dyno.The venturi made for 750 cfm will respond better to real world situations imo.I can't wait to see the tests.

[@dalewarriorofthesea3998]

Dominator on the dyno 4150's on the track

[@UnityMotorSportsGarage]

That could very well happen! Andy

[@realazliving]

Thanks, Andy. Always good info. Dominators, of course. 😅

[@patrickmoore1017]

Dominators for the win!

[@thedobermangang3503]

When it come to power do you think the carburetors better than the EFI

[@josephdavis6198]

Knowing that Allstate build some of the best carbs out there, and you got couple custom carbs there, I am going with there 750s. But I do think for all out HP on the dyno it might be the Dominators. This should be good. I think I need to call Allstate after seeing those Beauties coming out of the box . They will look Awesome on Mixed Up Boss for sure.

[@keithiverson6687]

I think the Dominator will have better cylinder to cylinder distribution, so a little more power, but the 4150 will have a better signal to the boosters, so maybe a better transition when the throttle opens and launch/drivability gain. The 4150 750 has a very good Venturi design, which is hard to beat and I can’t see a restrictor in the booster being better.

[@Redneckairflow]

Im in the process of doing some interesting reshaping to the top of a 750 cfm holley. I got a video up on my channel id love to hear your thoughts/feedback

[@UnityMotorSportsGarage]

I will check it out. Andy

[@Redneckairflow]

@@UnityMotorSportsGarage thanks

[@rickyfulks889]

Do ya have the Caspermatic in her now Andy?

[@johnbnos944]

Put 16-hole booster inserts in the dominators and i bet it'll run a lot better, plus you can run less main jet.

[@deerslayer5863]

For your set up two 4150s are the way to go

[@vrm86gt]

the tight spacing of the intake runners on that tunnel ram makes me think 4150 style will be better? I guess we will find out! gong to be a cool test Andy!

[@WhiteTrashMotorsports]

Be careful with ebay o2 sensors there are a lot of counterfeit ones advertised as genuine Bosch.

[@UnityMotorSportsGarage]

So far I have been lucky.. but this is only the second set I've bought off of there.. We shall see Andy

[@benrossbach6501]

? Are you changing the top of the intake to 4150 or adapters.

[@UnityMotorSportsGarage]

I modified a 4150 to take a 4500 and it's reversible

[@UnityMotorSportsGarage]

Here you go kzbin.info/www/bejne/p2PLkJ1_hrl1qZY

[@benrossbach6501]

Awesome as always thanks

[@outlawbillionairez9780]

@@UnityMotorSportsGarage I watched the video at the time, but it'll help to put this all in perspective. 👍

[@strokermaverick]

Andy, I believe, the modern double pumpers will out perform the dominators. Due to, the modern technology in today's carburetors.

[@rcadd1ct]

I am guessing dominator for max power due to it having fuel paths for a 1050, but the 4150 will have better street manners as they had more Holley development money spent there.

[@mcalweegs]

4500' flow rating are at 1" H20 where 4150 ratings are at 1.5" H20. This means Dominators flow way more at same pressure drop.. Not surprising that peak power is higher with Dominators.

[@Mike-xt2ot]

With a spicy engine the carb could be a restriction in and of itself.. Or too much will affect accel.... Find the sweet spot..

[@bigboreracing356]

When my O2 sensor dies from C16 I burn the lead off with a torch.

[@UnityMotorSportsGarage]

I've never tried that.. I will have to give it a shot! Andy

[@bigboreracing356]

@@UnityMotorSportsGarage Use a propane torch (I use a brazing torch)to get it slightly red until smoke stops exiting the vents . Doing a before and after voltage test will help. Trick is not to get the sensor extremly hot. Do a free air calibration and you are good for a few more test hits.

[@MrScoopage]

I'm voting 4150 carb as the winner for street use. But I really don't know. Both are sweet setups

[@stevewelborn8744]

I think the 4150's will come out on top with drivability and be very close on power. On a engine dyno the dominators would make a little more power.

[@bcbloc02]

I think the dominator wins on all out HP but the 4150 will drive better and maybe even get better mpg from better atomization.

[@brucekultgen3015]

Alstate carburaters ?

[@Robs-Garage-experiments]

A very very well known shop in. Central Islip New York, located on LingbIsland. There very good at what they do.

[@UnityMotorSportsGarage]

Yes Top notch folks! Andy

[@roberthollinshead2325]

Those tests will tell you nothing about the flow capabilities of the carbs- the engine will only pull in as much as it needs. Do an actual flow test too... both are probably plenty big enough for that engine? Whichever can deliver the best fuel curve will make the best power curve I would think

[@brucekultgen3015]

Where are you going to airflow these carb's WET? The best way to test!

[@UnityMotorSportsGarage]

The one thing you need to think about is Airspeed.. the higher velocity through the 4150 will it make it perform better? We will see Andy

[@UnityMotorSportsGarage]

I don't have the ability to wet flow test a carb.. sorry I wish that I did Andy

[@brucekultgen3015]

The question i had was directed to roberthollinshead.

[@UnityMotorSportsGarage]

@@brucekultgen3015 gotcha.. Andy

[@f.chrisliuzzo7889]

I bet many engines have been laid to rest from tuning carbs without an o2..

[@bigboreracing356]

That is why you should read spark plugs also and not rely solely on O2 sensors.

[@dondotterer24]

I'm guessing the 4150s will give you a better 60 foot.

[@randymcqueen3030]

Dominator flow more.But your motor may like 4150 better.

[@patrickmazzone9066]

allstate 750

[@UnityMotorSportsGarage]

They are both Allstate carbs the Dominators were built by them as well Andy

[@patrickmazzone9066]

Great

[@shacklifecustoms8430]

4500 are junk