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

All of the performances four barrel carburetors on the market today can trace their roots back to Holley and Carter offerings of the 1950s.
Here is a breakdown of the major differences between them, their evolution and the problems/benefits of each type based on their secondary actuation.
#classiccar #engines #musclecar
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[russelltripp]

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.

[chrisl]

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

[mikeyonce]

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.

[Everything]

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

[robpeters]

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!

[TonyGeneseo]

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

[unclesquirrel]

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

[stevenbongiorno]

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!!!

[harriettedaisy]

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.

[leecrt]

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.

[steveedwards]

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

[spankyham]

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.

[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.

[davidsteele]

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 😅

[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.

[craighansen]

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.

[billybobholcomb]

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

[AryDontSurf]

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

[richardlarson]

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.