Mechanical & Vacuum Secondary Holley VS Carter/Edelbrock, Rochester Velocity Style Carburetors

[@russelltripp9313]

When your videos go long, I still can't click off of them. Your presentation is excellent. I have learned so much from your videos and have had more fun playing with my cars and motorcycles because of what I've learned from you. Thank you. Keep it up.

[@CashMullen-ng4sr]

I always increase the playback speed to 1.5

[@Everything817]

Every car question I end up with leads me back to Uncle Tony's channel.

[@mikeyonce2323]

The Thermoquad also had a phenolic fuel bowl middle section to keep the fuel cooler. Many years ago I had an 850 cfm Thermoquad on my 440, it was awesome. Many people at that time were puzzled by them, but they are actually pretty simple to understand, and their construction also pretty simple. They were/are a very versatile carb with their small primaries and huge secondaries.

[@chrisl7511]

Could listen to you talk about anything car related. Love the way you present the history, basic stock function, and hot rodding tricks in vids like this. More history lessons please

[@robpeters5204]

I love the sound when the 4 barrels open up, My dad bought a 86 Pontiac Parisienne bro ham with the 305that had the Rochester carb. That thing would haul on the highway. Loved passing cars when the 4 barrels would open up. Get sucked in the eat every time. Love your carb talks. You make them simple for those to understand. Keep doin what you do!

[@steveedwards1072]

EXCELLENT explanation. I’m a Quadrajet guy personally. Yes, if tuned properly, it’s always outperformed others I’ve tried. And who doesn’t love the sound from the secondary side! Peace

[@ccgrider1014]

YES!!! nothing like a big block anything with a quadajet sitting on top! 30 mpg on the primaries, and flushing the toilet on the power making secondaries, with the most AWESOME sound...the deer were VERY afraid!!!!

[@jeffrey4547]

plus u can build them up to a 1150 by opening it up

[@davidsteele1667]

I love Edelbrock carbs. I run them on my square body chevys and they’re great, but I couldn’t help but notice that when you started talking about a crude design you started eyeballing the Edelbrock on the table 😅

[@SweatyFatGuy]

The AFB from Carter and Edelbrock, doesn't matter which, is the least tunable and lowest power producing carb of everything he had on the table. They are wonderful for people who don't know how carbs work, how to tune, and do not really modify their engines. They are calibrated for stock engines between 300 and 350 cubes, you can bolt them on and go because there simply isn't enough tuning ability to make a difference, you get what you get. For a small block powered daily driven truck they are perfect, because you aren't trying to get the most power or mileage possible from them, they just need to idle and run. The reason for multiple carb intakes in the 50s and 60s was because the AFB can't flow enough air to feed a big power engine without more than one of them. On the other end of the spectrum the Qjet is VERY tunable, to the point it is excruciatingly easy to screw one up if you have no idea what you are doing. People don't know how they work, how to tune or modify them, and so they think they don't work well. Once you know how they function and what to do with them, they are easily the best street carb made. Set it and forget it until the gasoline varnishes the inside of the carb so bad it clogs stuff. With the Qjet you will have mileage and power, with excellent drivability, but you have to know how to get that from them. It was always amusing when I would loan a Qjet or Holley to a guy who wanted to make his car faster, so he could replace the AFB on it. They never wanted to give my Qjets back, because they were set up right. We dropped a full second off one guy's Luv truck with its ZZ4 with a carb spacer, Holley 3310, secondary spring kit, and a bit of timing advance over his combo with the AFB. He could barely get it in the 13s, I spent 40 minutes on his truck and it was running mid 12s. He said it even picked up some mileage driving it around town. My friends who don't know carbs all run Eddy's, and its a good thing. They can really mess up a Holley fast. Great little carbs for the people who just aren't into getting all the power, mileage, and being able to tune it. You can do it with them. but it takes a hell of a lot longer to make an E carb run right. Don't even get me started on the Edelbrock Qjets... what a mess they are.

[@davidsteele1667]

@@SweatyFatGuy I don’t disagree. I run an AVS2 800 cfm on a 454 and I’ve been playing around with a AVS2 650 cfm and 1411 750 cfm on a mildly built SBC 400. They’re not daily drivers, but they are also not hot rods. I just love cruising around in my old trucks and Eddys serves that purpose well.

[@hitekbigmek]

@@SweatyFatGuy Very well spoken , Sir .. a carb design that runs trouble free and on oem straight 6 cylinder, v6, and virtually every cubic inch v8 GM produced .. for 20+ years is a very sophisticated design and being production line installed on some Ford and Chrysler vehicles attests to that .. in '72 i rebuilt my first Qjet and it was a fuel geyser but i went back thru it and it ran on my next 4 vehicles .. since then i've built hundreds for street and race vehicles at my shops and the Chevy dealer i worked at as a young man .... during that time i pored over anything written by Doug Roe, Brad Urban .and others .., i spoke at length with a Rochester engineer who'd visit at the GM training center where the dealer would send myself and our techs to .. best of all because of the number of carbs produced the basic core carbs can be had at low cost and sometimes free .. the mention of the thermo quad as competition for the Qjet is a fallacy .. just in the engineering alone .. no cracked plastic fuel bowls,their silly kinked ,cracked accelerator pump circuit hoses had to have been an after thought .. I'm thankful that every part needed to build and tune a Qjet are readily available

[@every-istand-ophobe6320]

Edelbrock are fine for guys that just have a mechanic work on all their stuff.. Holley is for guys that actually work on there cars.. pretty simple.

[@davidsteele1667]

@@every-istand-ophobe6320 whatever 🙄

[@leecrt967]

Very nice evolutionary description of the various 4bbl carbs. I would have added that the Rochester 4bbl was a spreadbore design. But, hey, I forget where I put my reading glasses 10 times a day.

[@MrTheHillfolk]

I keep getting distracted by an old burn mark on one arm of this sweatshirt I'm wearing. Beater clothes for the shop. It's a black spot and I keep thinking a bug is crawling on me 😂😂

[@stevenbongiorno9277]

I’m definitely a Holley fan! I struggled at first with my first Holley. My Camaro came with a Rochester 2 bbl, and I was building my first engine. I bought a new intake and Holley 3310 with my intake and carb package from Midwest back in the day. Somebody told me that the Carter AFB was a good carb, but when a buddy gave me one, and I took it apart, I had so much trouble with it, so I went back to my Holley, and never looked back. Nowadays you’re seeing all these awesome versions of the Holley coming out,(especially the new Edelbrock carb!) that I know why I’ve been running and modifying Holleys all this time. Thanks for the informative video!

[@ArdFarkable]

I didn't even realize this came out today! Thanks for the video! We are still using carbs out here!!!

[@unclesquirrel6951]

One of the cool feature of the Quadrajet would be some of the Quadra jet models came with the altitude adjusting Bellows .

[@ripvanrevs]

I caught a squirrel in the rad fan of my car the other day. I thought of you. It was the squirrels fault.

[@unclesquirrel6951]

@@ripvanrevs lol

[@NSUGS]

Squirrels get at the bellows, don't they...?

[@davidleonard8369]

Let’s not forget the hot idle compensator too. Or the built in main well leaks. Lol.

[@MrTheHillfolk]

@@ripvanrevs I'm always mashing the brakes for those little fellas. I'm not gonna go all Geico squirrel commercial and crash off the road but so far I've done ok,I'll look back for a road stain and won't see one. 😬

[@grumpycarlsworld]

Very nicely explained Tony. I fell in love with the Thermoquad after fitting one to my 360. Their main advantage, as with the Rochester and AVS is the engine decides how much fuel/air mixture it wants, once set up correctly, not just opening up and overcarbing it like a DP can.

[@clembob8004]

Yep, the T-quad is my favorite carb too. And I found out by accident that a 780 cfm works like magic on a 318 or 340. Lots of cfm seems to be what the small blocks like. I had a vacuum secondary 650 Holley and had nothing but trouble and couldn't get it to perform that well, and a buddy gave me a 780 T-quad off a Cordoba with a 400 big block. I thought it would be too much carb for my 318 (mild build, high rise intake, headers, 340 cam, etc), but it was magic. That thing would just scream when I put my foot in it.

[@AryDontSurf]

Eating tacos and watching UTG in the shop for lunch. I may not have tact but I sure got style

[@NMTRUCKER]

Nice carburetor functionality review. I am now running an Edelbrock AVS2 on my ‘69 Chevelle SS. It has eight orifices per booster to aerosolize the gas better than just a single gas stream. It seems to work really well for my application and driving style. Otherwise the AVS2 is the same as the AVS style carburetors.

[@Texasmule]

AVS2 can also be used in hilly area and even off road racing if you change it around

[@Terminxman]

I went and tried an edelbrock again recently and got an AVS2 because so many people were raving about it and the drive ability and part throttle response rivals any holley I’ve experienced. Main issue is the fuel evaporating off fast if it sits

[@sjd7188]

@@Terminxmantry a phenolic spacer or the insulating thick gasket they sell. Helps a lot with this especially if used in marine applications

[@bigdbandit64]

@@TerminxmanI think UT talks about how that circuit dries up over 48 hours all you have to do while driving is punch it to open the secondary’s circuits and jt will bog but by the second punch it will have filled with fuel again

[@craighansen7594]

I like the Thermoquad but when I switched to a single plane intake on my 70 340 the square bore Holley dbl pumper ran even stronger. That Thermoquad on the factory 1971 iron intake did run really good. It also helps when companies sell well stocked tuning kits with lots of jets, metering rods and other tuning aids. Carter, Edelbrock and Holley have such kits. GM Quadrajet 4bbl carbs are good but hard to tune if you need a assortment of jets, metering rods, a good assorted kit didn't really exist.

[@roachsrods4395]

As far as qjets go, I buy parts carbs any chance I get. And if I need a jet or rod that I don't have you can easily get singles/ pairs of jets on ebay whatever size you need

[@spankyham9607]

I enjoy these videos. Very informative information that only carb monks know and never tell anyone else. Annular Boosters would be another evolution. The nice thing about the AFB is that it is almost idiot proof. Unless they are clogged, they work out of the box for every day drivers and moderate performance. Now I understand why you rate carb CFM the way you do, the door is what you are factoring in as a CFM loss vs Holley.

[@camaroguy2919]

Hey, uncle Tony, I wanted to say thanks for the gas-in-a-water bottle trick to check vacuum leaks. Having to chase a leak down in my 82 square body made it easy and painless without having to go buy an expansive can of brake clean or the like.

[@MrTheHillfolk]

You don't even need gas really ,got some rubbing alcohol in the medicine cabinet? Just some juice to temporary plug a possible leak. Haha literally anything liquid ,even water, and listen for engine rpm change as usual.

[@billybobholcomb8768]

Well done! I still love my Q jets. I might not ever find anything better for gas mileage and drivability.

[@tonypace2009]

I started having issues getting parts for them . stuff like the rear hangers and even the rods . also a common thing i always looked for was top plate that was pretty straight and base plates that throttle shafts wern't worn. was seriously considering getting reamers to install bushings for throttle shafts . the biggest issue was going to the salvage yards they want $36 for the carborators even with worn throttle shafts. by accident found out how to get them for $15 which used to be the price. i pulled a 800cfm off a car the throttle shafts were bad had lots of play took it to the front trying to work a deal didnt happen so took the carb back set it on the dash for next payday? come back Friday the carb is gone asked a worker he said they put loose carbs in the scrap barrel ??? shore enough there it was now $15?? I dont know why they could just sell me the carb first time as scrap since I showed the guy they were worn and I just needed a few parts from this one? Man zi miss the days of actualy haggling for parts some days you got a deal and somedays not as much of a deal So yes UTG I get the deal with the edelbrock it's part of the game? you can Take it apart somewhat that's fair play to check it and yousualy if they rather you didnt it's time to go down on price till either it's time to walk away from it or get it down to parts price.

[@MurphyTheBandChild]

I don't know about anybody else, but I'll watch any carburetor video you decide to make. Keep them coming!

[@TonyGeneseo]

By far the most thought out and informative carburetor history and functionality video I’ve seen yet on KZbin ! Thank you so much for your knowledge and sharing it with all of us that know just enough to be dangerous ! It IS appreciated !!

[@robsdeviceunknown]

This had me glued to the screen. Man this was fascinating. I learned a ton. I would have preferred it be a lot longer and go into more detail. Maybe you could do a round up on modern carbs and go into the detail of the differences. Love ya Tony, I sure do appreciate the education.

[@TCE63]

I have a Carter AFB on my 1963 vette and just learned the most about it. Thanks again UTG

[@jimmy_olds]

Great carb tutorial, UTG. I’ve had good results from Holley, Edelbrock, and Qjets… my favorite is a vacuum secondary Holley, typically street driving and a heavy car/pickup. Next is the Qjet.

[@harriettedaisy2233]

Tony, I always get something out of your videos. I really appreciate that you keep the application in the equation. So many people can’t think that objectively.

[@SweatyFatGuy]

Application is very important, what engine its on, how many cubes, cam specs, gear ratio, stall, weight of the vehicle, and intended use all matter a lot. The Edelbrock carbs make all my Pontiacs slower and use lots more fuel, the engines are too large for the carbs, and a 455 can handle a really fast secondary opening rate because they have high vacuum, and an 850 is usually on the small side for CFM. My 340 likes a small carb, and I have one of those cheap AFB like Demon carbs on it, uses more gas than the Qjet I had on there, but it doesn't drown that poor little engine at WOT. The Cuda is a rough application for a carb, small 340, 3.23 gear, stock stall, in a relatively heavy car with factory exhaust manifolds on it.

[@brianbrigg57]

Another great, informative video. How about an even deeper dive to explain the differences in annular and downleg boosters to explain the differences between them, their evolution and applications?

[@Floreypottery]

Always loved how my fox 302 that was bored out too a 3o6 ran with the edelbrock 750 when her secondary’s opened it was gone beat a few 93 cobras

[@stanmorinaka4551]

What a big help that was for me! I knew of them, but didn't know the difference. Thank you Tony!

[@snoman003]

This vid, combined with tha other vid on carb size now make sense. I remember way back I had an old Dodge van with a stock 318 2bbl and decided to chuck a 4bbl manifold and a Carter Thermoquad on it. It was at this point that I actually got some understanding of how under rated the 318 actually was. On the way home one evening, I got into a "disagreement" with a young fellow with a comparable year firebird, he was seemingly so upset that I managed to pass him on the highway at WOT that he decided to follow me to my destination to determine what engine I had. He was really upset when I showed him...

[@russelltripp9313]

I have a bone stock chevy 305 in a 27 t bucket. Exterior is dressed up with shiny bits and a dual quad tunnel ram with 425 cfm holleys. When I bought it it didn't run worth a damn. By watching your videos, along with Andy's videos on carburetor tuning, I got the carbs dialed in and it is a ton of fun to drive now. Great when cruising but when I step into it she gets up and goes like a bat out of hell. I only need to adjust the transition circuit slightly more to get rid of the millisecond flat spot when taking off from a stop. Almost unnoticeable but it is there. Thank you for all you do.

[@richardlarson2969]

Another great video Tony. I have learned so much from you, especially about carburetors. After what I've learned I can now look at a carb and I know what type it is. For me that's an accomplishment. Thanks Tony.

[@rickblinkco2223]

I tried to comment on the other carby video, couldn't access comments? I'm the same age bracket as Tony in Australia when I had fast cars the rule of thumb we used for flow rate to cubic inches was roughly 1.25ft per ci for economy, 2ft per ci for performance without losing some economy & 3ft+ per ci for outright performance.

[@ericwilson2585]

I had a 360 in my D150 that I put on a Holley Street Dominator single plane and a Holley 650 vacuum secondary on it, both were from a 318 cop car, and for some reason that thing worked so good I couldn't believe it. 360ci AWD 4speed manual trans and 18 miles per gallon. It was just this side of amazing.....

[@tl5108]

What you have the timing set at. Gas mileage on my truck tanked really bad for some reason

[@JohnThomas-vb9se]

I had a 69 Chevy pickup when I was younger. It had a sweet running mostly stock SBC in it. Cast iron heads and Intake with a very mild camshaft and headers. The absolute best Quadrajet I ever saw. Started great, idled great, and worked flawlessly when you stomped on it. Over time it developed the Q-jet stumble, but when I first got it, it was just smooth as silk. They really can be great carbs when they’re right.

[@ferdy1976]

Thanks, Tony! This is the best explanation of 4bbl carb variations on the planet!

[@jonoh4883]

Now THIS is what im talkin about Tony... Vids like this for the youngers.... getting into the features with comparative representation. .. Thanks .

[@witnesszer0]

i rebuild an eldelbrock once and took the spring off the primary flapper and put it back too tight and the carb was now a 1:1 at opening the primaries and seconders it was awesome i also took off the weighted flapper

[@pjimmbojimmbo1990]

At the end you nailed it when you said "the engineers knew what they were doing when they built these things" Unfortunately there are too many Bench Racing Keith Blacks that have Butchered any and all of these Carb designs, even before running them out of the Box.

[@LifeisGood762]

Learned a lot! The acronyms for the Edelbrocks had me confused. Aluminum four barrel and air vacuum secondary.

[@marclobato9690]

I'll always remember the sound of the qudrajet opening up. On 1980s and 1990s Chevy Carprice cops cars... Woohh whaaaaaaaa..... Grew up in the hood. Learned that sound at a young age 😆

[@uasparts]

THANK YOU, Tony- for taking your time to explain the basics to a couple of lost generations of folks who haven’t been taught how these basic mechanical devices work, and as a result, think of them as magical voodoo, whose workings have been lost to history. I beat this theory up all the time to millennials and gen Z folks, that mechanical induction really is far simpler than even the most basic TBI injection, and they still fight me! This type of content is absolutely critical, doesn’t matter if it’s for learning mechanical induction or not, the basics of fuel injection are also founded on the theory of mechanical induction as well, so even if someone rejects mechanical induction, they still need to know these basics if they ever are going to stand a chance at knowing microprocessor controlled induction as well. 👍🏾👍🏾👍🏾

[@markszczepaniak5888]

Good Video Uncle tony, I still use Holley 3310 750 Vacuum Secondary on my 340. I Still have the original Themo Quad like new, not being used sitting in a box. Thank you for this video, good refresher and good for the beginner.

[@thethrottlecracker]

Street Demon based on the T quad, is an awesome carb. Very affordable as well

[@craighansen7594]

They look good, think they are offered with a polymer fuel bowl/ main body. Would like to try one out.

[@thethrottlecracker]

@@craighansen7594 I've used many and suggested many. The result is the same; huge improvement and rarely need much adjustment.

[@leethorp2164]

Back in the 80's I built a mopar 318 with factory 340 heads,cam and intake. Stumpled across a cheap used Qjet and put it on. Got it tuned by buying a Rochester how to manual and parts from a local GM dealership. Put it in a Dodge Dart and man that thing would scoot. Outran a Corvette one time. Wish I still had that car.

[@clembob8004]

Great video! I never quite realized the difference between the Carter AFB and the AVS and Thermoquad and now I do.

[@ericjswindle]

Glad to know I’m not alone in my love of the summit carbs. I’ve run several of them on different applications and have always had good results.

[@kevinwestmoreland2099]

I've been using a Holley 4010 carb and it does okay. I've leaned the jetting as those annular boosters really flow the gas. It's on a modified chevy 350 with headers in a 1969 Chevy c 20 pickup.

[@slickrick5735]

Uncle Tony I was surprised you didn’t mention Edelbrock’s new 4150 gem but then I realized you already posted a video on that one. By the way just bought one and can’t wait to set it up!

[@raybrensike42]

I think carburetors were really ahead of their time. Did you ever notice how many spaceships in the movies resembled big carburetors?

[@MrTheHillfolk]

Carburetors: The original analog circuit.

[@donaldhalls2189]

Thanks for the video, all the best to you and your loved ones

[@TheTedsmith123]

Love Uncle Tony's simple and informative videos for the common guy to understand. I only wish I had a small part of the motor knowledge he has. He must have lived the life I wish I had to gain all this knowledge. Please keep up the great video content as long as you can. I really appreciate you sharing your go fast wisdom. Thanks Buddy!

[@petewielsma423]

Great info U Tony 👍 I had a qaudrojet on on my 63 Chev back in mid 90s , 350 Powerglide , secondaries opened and it was kicking it down a gear and pulled , great times . Cheers from Downunder 🍻

[@forthwithtx5852]

Always detractors. The term, QuadraJunk is one example. Man, they sounded awesome in just about any application, when the secondaries kicked-in. So easy to rebuild. I rebuilt at least a dozen of them in High School Shop class.

[@Yo-mamashouse]

I can't wait until you do the carburetor test on slag hammer, Holley versus Edelbrock!!....

[@Yo-mamashouse]

it's going to be fixed!!

[@markf4328]

Uncle Tony, You the man and enjoy your videos immensely. Not that I mean to correct you, (but I guess I am) According to the book "Corvette by the numbers 1955-82" by Alan L. Colvin page169 the WCFB on Carter carburetors stand for "Wrought Cast Four Barrel. Not that I go around trying to authenticate everything you say, it's just that I was watching this video last night and then had the Corvette by the numbers book out this morning doing some research for a friend and ran across it. Keep up the good work as I enjoy and watch all your vidoes. Cheers.

[@charliekerr9231]

Wow I was hoping you would talk about the 4165 holley spreadbore! I love them best of everything!

[@jamesford2942]

Thanks UT for the great description. I'm planning on running 2 500 CFM AVS2 Edelbrock carburetors on my TR5 tunnel ram with an open plenum. I plan on using progressive linkage and using the rear carb for the primary.

[@it426]

Uncle Tone! Imagine my surprise when you said Nashville! LOL!! Just assumed you were out east sir. Thank you for all the awesome videos sir!

[@brianhdueck3372]

Always something worthwhile on your channel Tony. Much appreciated!

[@BPattB]

I thought I remembered this video after the current UT video. UT says in a cruzer , " Use Edelbrock." Just bought the 1st 4150 for myself in the last 20 years. Always used Edelbrocks. The Holleys are more work to tune. That said, I'm still not close to tuned on the new 4150, but it definitely does out preform the Edelbrock. We'll see how reliable the Holley is. The Edelbrock was trouble-free. Change rods in the spring and fall. Holley to race Edelbrock to drive.

[@johnbossems2849]

Nice video Tony. I still love carbs too. I have had a Street Demon on my 1984 Dodge truck for the past 8 years. I like the spread bore design for every day street driving.

[@phillipsprague3275]

I always hear how much people criticize the Quadrajet, but there aren’t many carbs that are as diverse! Used on everything from 170 cubic inch 6 cylinder to a 500 cubic inch Cadillac! I’ve run them on every thing and my 13.23 second .040 over 350 and 125k turbo 400 trans 3.73 geared 73 Camaro averaged 16.7 mpg at 60 mph!

[@mikelaumaillier9271]

Great explanation on the different variety of carburetors used in our vintage cars. I've rebuilt many Rochesters and Thermoquads with good results. They always ran better after the rebuild. Can't comment on the others but I'm sure the results would have been similar. Got a Thermoquad on my Barracuda and it runs great. Would I be happier with a newer carb ? I doubt it. Thanks for all the great videos. Best Regards - Mike

[@Ozarkprepper643]

Carburetors is always a good topic. I had a Mustang in the late seventies that had a holly 3 barrel carburetor. When swapping it out it sold for more 💲 than the new double Pumper. I'm sure UT has done a video on it.

[@allanmcelroy9840]

3bbl sounds rare. Never heard of one

[@MrTheHillfolk]

@@allanmcelroy9840 I don't know a lot about em except vids and seen one or 2 , but yeah they were legendary from what I hear.

[@brucejones7389]

the holley dominator replaced them...they were developed for NASCAR

[@Ozarkprepper643]

@@allanmcelroy9840 not as rare then as they are now. I think it was 950 CFM. It was a real powerhouse. But it , OR I had tuning issues. Hindsight would have kept it.

[@ROYALPRIX]

As a younger guy, I love the history lesson mixed in with the tech/info.

[@houtanarefi3325]

I like Thermoquads more than others, They are tricky but I know them well also they are super easy all tuning screws are big and easy to reach.

[@shawnwieser7101]

Just a comment Edelbrock also manufactured Q-Jet Carburetors

[@dongeorge4037]

Thanks for making sense out of carb termonology.

[@donaldgrove229]

Toilet bowl cleaners work great on the crud from corrosion. Don't leave more than 5-10 minutes. Can reapply. Love the videos.

[@clintmatthews4342]

I have old Carter AFB on my Fox's Windsor. Works great and easy to adjust.

[@madbrax5184]

I love your carburetor videos! Thank you Uncle Tony.

[@jonoh4883]

I would argue that the Reg Edelbrock/Carter is easier to tune for a youngster than the comparable Quadra Jet.... Pulling the whole air horn for adjustment is just a deterrent when comparing a Q jet to a Carter/Edelbrock .... Keep Hot Rodding A Live.. Thanks Uncle Tony and Uncle Kathy..

[@josephdipalma5989]

Glad to see your back to these interesting videos.

[@Zekais]

According to the antique Carter manual I still have, WCFB stood for "white cast four barrel", and the AFB name designated the change from basically pot metal to aluminum. Other antique stuff I have, since I am definitely an antique and got it when it was current, give the same translation. Trying to explain pot metal, or white cast metal in this era, though? Uh, no, not me.

[@todddenio3200]

I love how it is put into terms that anybody from a kid to an engineer can understand - (well, maybe not engineers because they seem to only understand how to make things too complicated to be functional or practical for a normal person to be able to understand.)

[@angiemccain70]

Always was intrigued by the variable venturi (Predator) carbs, in fact my best bud had one on his 440. problem was the rest of the setup was so mismatched that we never really were able to see its potential. Are they still on the scene? What's your take on them?

[@ericvoge6678]

I still see them on gas pulling trucks from time to time.

[@mattbauckman9907]

Ford Autolite 4 bbl carbs were fairly common and most people I talk too said they were pretty reliable.

[@davidleonard8369]

The autolite carbs are basically Holley carbs. Many of the parts even interchange, jets and power valves come to mind.

[@pjimmbojimmbo1990]

IMHO, the Q-Jet is the Apex of Carb Design. It was reengineered in the Mid 70s with Altitude Compensation, and then again in the early 80s, when the Primary Metering Rods went under Computer Control. Its Design, allows for an almost Infinite variety of Fuel Delivery Curves, and it has been used on very small engines to some very large. Most Q-Jets were rated a 750CFM, but a few were rated at 800CFM.

[@fishstix1299]

Love the QUADRAJETS...👊🇺🇸✌️If you know how to tune them right they'll suck the hood thru the top.😁

[@kennethporst1738]

So far IM Loving the double barrel Pumper...send me TWO of them 😀

[@brucejones7389]

Learned a lot from this video even though I'm in my 50's

[@anthonyjackson280]

it would be interesting to see a video about the multi-carb side draught set ups using SU's/Strombergs/webers etc on European cars. The SU's are interesting as they have vacuum controlled jet opening with dash pot damping and no chokes but a mixture control that increases the jet opening. I had dual SU's on a 66 Triumph.

[@ercost60]

Please do a video on the Rochester HV and H (mechanically activated secondary) 1BBL carbs on LM Corvairs.

[@DamnItBoyGarage]

Thanks Tony, another day that I learned something.

[@frankc1430]

Still didn't discuss the application needs for vacuum secondaries and manual secondaries.

[@Z_732]

Now you just need to break down that new Edelbrock.. the one that's taking over for Holley.. I can't wait until that vid! Good vid UT!

[@1968440GTX]

Hi Tony, just finished watching Nick's Garage and he's dyno testing a 440 with aluminum heads and high rise single plain intake with a 950 cfm carb. After a couple of tests it made 495 h.p. he removed the 950 and replaced it with a 750. Next couple of tests came in at 520 h.p. I saw your video from last night about your discussion of carb size and cubic inches. Though this was a good comparison in carb vs cubes.

[@UncleTonysGarage]

I didn't see the video, but here is something take into account. The Holley 950 is actually an 820 CFM carb (I know, I know...didn't make sense to me either when I first learned about it) and out of the box, it is calibrated as a true race carb. If the 440 in question had conservative cam/compression/porting/timing the 25 horse difference with the smaller carb calibrated for street type use makes sense.

[@paulcabezola3559]

Hey Tony, I seem to remember that Carter had a "Competition" version of the Thermoquad I think it was around 1000 cfm. Have you ever run one of those ?

[@brucejones7389]

I have one in my garage right now sitting on a shelf

[@frankdmioli925]

On my '72 Sebring Plus w/400 4sp had a 815cfm thermoquad. Multiple tunings w/ different rods & jets let me set it up good w/ .509 cam, electronic dist total timed @ 31° btdc. Had a dist. mark for starting/daily driving@ 6°btdc. Lots of memories!

[@frankdmioli925]

I'm pretty sure it was 1030 cfm, if I remember correctly.

[@paulcabezola3559]

Could be it's been a while.

[@knightridersofgreece]

Tony please make a video for carburetor spacers and the pros and cons!

[@RockstarrMafiaa]

Love the videos man . I'm a Chevy guy I was fighting with my qjet until I found you

[@Anthony-vq1wn]

UT, great video as usual buddy. Educational, fun and informative. 😎👍

[@DanEBoyd]

The Carter abbreviation referenced the particular update which differentiated the new model from old. I actually work for the son and grandson of a guy who was the president of Carter! (Probably when Carter was President...)

[@brocluno01]

AVS now stands for Annular Venturi System, I believe ... The changed the boosters to ring feed instead of down leg feed.

[@patrickcasey9290]

Hello Tony been following your channel from day one and love the content, very informative and constructive, keep up the great work chief 👍 , pat casey 🇬🇧

[@Jason78400M]

Good vid. Nice to see a lot of comments here from the carb crowd. I’m a fan of both Holley and Edelbrock. Looking forward too the test against one another.

[@mostlyoldparts]

It has been my understanding the WCFB was an acronym for White Cast Four Barrel due to the material and casting process of the pieces.

[@ohm1945]

After seeing the previous video regarding the silly formula to calculate your engines carb cfm, I researched a little further. This one had me read the article a couple of times. The 337 Chev producing 350hp had a 600fm square bore Holley. That’s factory OEM. I’d always thought it was the 750cfm Quadrajet that was on these higher HP engines

[@anthonysantiago1999]

Carb history.. Great stuff Tone!

[@thesh111t]

Yet another great video Tony. Can you please go over the differences between a double pumper and a Dominator carb? Aside from the footprint and the CFMs (yes I know they made "small" Dominators also). Aside from big big flow, there are other differences, please explain.

[@prestonrieger8410]

Dominators are double pumpers. They were designed specifically for racing, they have a larger footprint to allow for larger venturis for more airflow. If memory serves the standard 4150 double pumper is limited to I want to say 950 cfm. Yes nowadays you can get pro form main bodies and create kind of a hybrid between a 4150 and a dominator and get around 1050 cfm airflow. But anyway the dominators larger size allows flow rates up to 1450 cfm from a single 4 barrel.

[@robertstewart2356]

Have you heard this one ? This man has a voltage regulator that needs a ground . He mounted it on rubber and tan a ground wire to his carburetor with a ground switch on it set up to close the ground when it was under full throttle. So when he was at the drags when he stood on it the regulator has no ground and alternator was not working until he was off the gas

[@TheTreasureGuard]

The Thermo-Quad (TQ) was initially released for competition in 1969. Chrysler may have invented the thermoquad in the very early 1960s for experimental engines.

[@UncleTonysGarage]

It was released in 68 as an aftermarket upgrade for the Quadrajet. Chrysler had nothing to do with the carb until 1971 when they used it on the 340.

[@iwinnimi]

I run a holly 650 DP mechanical secondaries with a 6" velocity stack on a 1970 Chevy Monte-Carlo small block 400 (406) bored over. In a 57 Chevy wagon. If I have to pull stumps, I'm going up to the hot rod.