My Carburetor journey.

[Orig69]

Webers are cool. Once though I talked to a guy that showed me a Weber that was an exact copy of a Eddy/Carter AFB style carb.... is that legit?
Cross ram intakes are huge, if I had more time I would like to try a long ram intake.....or this one thats for sale now close to me, Eddy intake with x6 Holleys, fits RB etc:

View attachment 1523450

Yes it's legit. Weber was producing the carburetors with the Edelbrock name already attached.
Picture of an Edelbrock Carburetor

Carter Competition Series

 

[glrestomod]

I’m really interested in your thoughts on a carb for my General Lee. I have a stock build (cam, compression, etc.) on a 1970 383-4bbl. It is bored 0.60 over and has an Edelbrock I take that says DP4B. The cam is supposed to be stock (and seems that way, or just slightly more than stock). Running factory exhaust manifolds (but may in the hopefully not too distant future) add headers, I’m also running the 727 automatic. I won’t be racing it but I want to get better mileage and snappy low end with great transition/no hesitation between idle and WOT.

I called Edelbrock and they recommended an AVS 2 650, and called Holley and they recommend their 680 VS. What would you think is the best for my application? Would you recommend what they offered or something else (I can’t do the TQ)? Thanks in advance for any help you can offer

 

[Geoff 2]

The AVS2.

 

[Jonas Nordstrom]

I’m really interested in your thoughts on a carb for my General Lee. I have a stock build (cam, compression, etc.) on a 1970 383-4bbl. It is bored 0.60 over and has an Edelbrock I take that says DP4B. The cam is supposed to be stock (and seems that way, or just slightly more than stock). Running factory exhaust manifolds (but may in the hopefully not too distant future) add headers, I’m also running the 727 automatic. I won’t be racing it but I want to get better mileage and snappy low end with great transition/no hesitation between idle and WOT.

I called Edelbrock and they recommended an AVS 2 650, and called Holley and they recommend their 680 VS. What would you think is the best for my application? Would you recommend what they offered or something else (I can’t do the TQ)? Thanks in advance for any help you can offer

A 800 Thermoquad (Super quad) would be awesome as your intake can take a spreadbore carb.
Though, lots of time to invest there in finding parts/ a TQ in good condition etc etc

The Holley 680 VS would work good and give you even power.

The AVS2 650 would work really good, give you a snappy bottom and smooth transition.

The Street Demon 625 is a little trickier to tune than the AVS2 and could also have bad QC on the one you get.
....but it would give you the same or better bottom end than the AVS2 and more fun when opening up the secondaries.
It would also give you better mileage with its smaller than AVS2 primaries and triple stack boosters instead of the Annulars.

Also try to get a spacer in there between the intake and carb to protect from heat.

 

[Orig69]

I’m really interested in your thoughts on a carb for my General Lee. I have a stock build (cam, compression, etc.) on a 1970 383-4bbl. It is bored 0.60 over and has an Edelbrock I take that says DP4B. The cam is supposed to be stock (and seems that way, or just slightly more than stock). Running factory exhaust manifolds (but may in the hopefully not too distant future) add headers, I’m also running the 727 automatic. I won’t be racing it but I want to get better mileage and snappy low end with great transition/no hesitation between idle and WOT.

I called Edelbrock and they recommended an AVS 2 650, and called Holley and they recommend their 680 VS. What would you think is the best for my application? Would you recommend what they offered or something else (I can’t do the TQ)? Thanks in advance for any help you can offer

The 625 CFM Carter AVS carb was original on 383 4bbl cars, so no jet changes required. If you can find a good used original carb it will work really good right out of the box.

 

[glrestomod]

A 800 Thermoquad (Super quad) would be awesome as your intake can take a spreadbore carb.
Though, lots of time to invest there in finding parts/ a TQ in good condition etc etc

The Holley 680 VS would work good and give you even power.

The AVS2 650 would work really good, give you a snappy bottom and smooth transition.

The Street Demon 625 is a little trickier to tune than the AVS2 and could also have bad QC on the one you get.
....but it would give you the same or better bottom end than the AVS2 and more fun when opening up the secondaries.
It would also give you better mileage with its smaller than AVS2 primaries and triple stack boosters instead of the Annulars.

Also try to get a spacer in there between the intake and carb to protect from heat.

Thanks for the reply! I went with the AVS2! I have another question about the linkage: mine is a mess! I want it to be fixed back correctly. Here is my current setup on a Holley 4160 that I’m replacing:

 

[glrestomod]

A 800 Thermoquad (Super quad) would be awesome as your intake can take a spreadbore carb.
Though, lots of time to invest there in finding parts/ a TQ in good condition etc etc

The Holley 680 VS would work good and give you even power.

The AVS2 650 would work really good, give you a snappy bottom and smooth transition.

The Street Demon 625 is a little trickier to tune than the AVS2 and could also have bad QC on the one you get.
....but it would give you the same or better bottom end than the AVS2 and more fun when opening up the secondaries.
It would also give you better mileage with its smaller than AVS2 primaries and triple stack boosters instead of the Annulars.

Also try to get a spacer in there between the intake and carb to protect from heat.

I ordered the AVS2, the Mopar Linkage kit (part # 1481) as well. I was looking at the specs and things after I purchased it and it said these two items are required:

1. Throttle lever studs (part #8007)
2. Rod extender (part #’s 8003 and 8004)

Also, it seems the rod extender has the 2 part numbers I listed above as one is 5/16” and the other is 1/4” and I don’t know which one I need to order.

Any help you can offer is greatly appreciated!

 

[glrestomod]

The AVS2.

Ordered it today! Thanks for the help!

 

[glrestomod]

The 625 CFM Carter AVS carb was original on 383 4bbl cars, so no jet changes required. If you can find a good used original carb it will work really good right out of the box.

Thanks for the reply/help! I ended up going with an AVS2

 

[66 Sat]

You might not need any need parts to mount the AVS2. You can unbolt the bracket from the Holley and bolt it on the Edelbrock. You may have to drill a hole here and there to get it all to work.
Here's what I did to mine:

 

[glrestomod]

You might not need any need parts to mount the AVS2. You can unbolt the bracket from the Holley and bolt it on the Edelbrock. You may have to drill a hole here and there to get it all to work.
Here's what I did to mine:
View attachment 1643975View attachment 1643976View attachment 1643977

Nice! Well, mine has the wrong parts on it and I want it to look better. That’s great what you did with yours! How do like the AVS2?

 

[66 Sat]

How do like the AVS2?

The AVS2 has not been the "night and day" difference compared to my Holley 1850 that some folk proclaim that it should be.

The low speed response was soggy although it did feel slightly stronger at the top end compared to the Holley 1850 (600 vac sec). It certainly wasn't stronger anywhere than the 700 Double Pumper I also own.

A few weeks back I pulled the top of the carb off again and had a look if I could see any obvious issues. I ended up removing both the annular boosters and giving them a good soak/spray with some throttle body cleaner I had. I also removed and cleaned the accelerator pump nozzle even though I had visually confirmed that was spraying healthily and evenly.

I was concerned that the tiny holes in the annular boosters might not have been drilled properly or had some flashing still in them, causing the poor low speed response. This was a brand new carb by the way.

Well - it did make a difference! The throttle response from idle is now much cleaner, like the Holley on it's best day, but all the time. Not sure if it's any faster, but it does feel sharper.

I'm hoping to get to the track next month - that will be the ultimate test in my eyes of whether it was worth swapping over.

 

[glrestomod]

The AVS2 has not been the "night and day" difference compared to my Holley 1850 that some folk proclaim that it should be.

The low speed response was soggy although it did feel slightly stronger at the top end compared to the Holley 1850 (600 vac sec). It certainly wasn't stronger anywhere than the 700 Double Pumper I also own.

A few weeks back I pulled the top of the carb off again and had a look if I could see any obvious issues. I ended up removing both the annular boosters and giving them a good soak/spray with some throttle body cleaner I had. I also removed and cleaned the accelerator pump nozzle even though I had visually confirmed that was spraying healthily and evenly.

I was concerned that the tiny holes in the annular boosters might not have been drilled properly or had some flashing still in them, causing the poor low speed response. This was a brand new carb by the way.

Well - it did make a difference! The throttle response from idle is now much cleaner, like the Holley on it's best day, but all the time. Not sure if it's any faster, but it does feel sharper.

I'm hoping to get to the track next month - that will be the ultimate test in my eyes of whether it was worth swapping over.View attachment 1644024

That’s awesome!!

 

[Jonas Nordstrom]

The AVS2 has not been the "night and day" difference compared to my Holley 1850 that some folk proclaim that it should be.

The low speed response was soggy although it did feel slightly stronger at the top end compared to the Holley 1850 (600 vac sec). It certainly wasn't stronger anywhere than the 700 Double Pumper I also own.

A few weeks back I pulled the top of the carb off again and had a look if I could see any obvious issues. I ended up removing both the annular boosters and giving them a good soak/spray with some throttle body cleaner I had. I also removed and cleaned the accelerator pump nozzle even though I had visually confirmed that was spraying healthily and evenly.

I was concerned that the tiny holes in the annular boosters might not have been drilled properly or had some flashing still in them, causing the poor low speed response. This was a brand new carb by the way.

Well - it did make a difference! The throttle response from idle is now much cleaner, like the Holley on it's best day, but all the time. Not sure if it's any faster, but it does feel sharper.

I'm hoping to get to the track next month - that will be the ultimate test in my eyes of whether it was worth swapping over.View attachment 1644024

So QC fails again on a AVS2 this time.
It seems that whatever you buy today needs a good check before starting it up.

A while ago I got a brand new in box alu 750 Holley that had a lot of shavings in the channels...

 

[Jonas Nordstrom]

Thanks for the reply! I went with the AVS2! I have another question about the linkage: mine is a mess! I want it to be fixed back correctly. Here is my current setup on a Holley 4160 that I’m replacing:

Sorry, not much help from me here as I made a custom bracket and wire to the 727.
Though as earlier stated, some edelbrock mopar bracket and pin should fix it.

 

[NoCar2023]

Thanks for the reply! I went with the AVS2! I have another question about the linkage: mine is a mess! I want it to be fixed back correctly. Here is my current setup on a Holley 4160 that I’m replacing:

View attachment 1643952

View attachment 1643953

View attachment 1643954

View attachment 1643955

Agree, that is a mess.

 

[Bee1971]

The AVS2 has not been the "night and day" difference compared to my Holley 1850 that some folk proclaim that it should be.

The low speed response was soggy although it did feel slightly stronger at the top end compared to the Holley 1850 (600 vac sec). It certainly wasn't stronger anywhere than the 700 Double Pumper I also own.

A few weeks back I pulled the top of the carb off again and had a look if I could see any obvious issues. I ended up removing both the annular boosters and giving them a good soak/spray with some throttle body cleaner I had. I also removed and cleaned the accelerator pump nozzle even though I had visually confirmed that was spraying healthily and evenly.

I was concerned that the tiny holes in the annular boosters might not have been drilled properly or had some flashing still in them, causing the poor low speed response. This was a brand new carb by the way.

Well - it did make a difference! The throttle response from idle is now much cleaner, like the Holley on it's best day, but all the time. Not sure if it's any faster, but it does feel sharper.

I'm hoping to get to the track next month - that will be the ultimate test in my eyes of whether it was worth swapping over.View attachment 1644024

Working on a AVS2 800 for a friend (Been running one myself for about four years now) who has been having RPM issues on the top along with pinging/detonation - Verified fuel pressure at 5,000 RPM at 4.5 psi when issues start by taping a gauge to the windshield - Verified fuel flow , throttle linkage , throttle plates fully opening , air door adjustment . Finally pulled out the secondary jets verified at .104 went up to .107 with no change - Pulled the jets again and tried spraying some carb clean through the passages , very little flow through the secondary boosters - Removed the boosters , no change

I told him to send it back to Summit Racing

Installed a Carter Competition Series 9755S 750cfm that I had new in the box just to see what direction if any - Engine came to life on the top end , problem solved (Forgot what it felt like with those non adjustable weighted air door over the secondaries)

My AVS2 800 the factory floats where a mess brand new out of the box , and one of the float baffles wasn’t installed properly hanging over the secondary jet that I remember

 

[Orig69]

Sounds like that AVS2 800 has something wrong with the secondary circuit.

The carbs that Edelbrock is selling are basically the same as the Carter AFB Competition Series carbs. (except some models)

I did say in a earlier post (post number 65) that a Carter carb would work really good right out of the box.

 

[Geoff 2]

Carter never made an AFB that had 1.75" throttle bores; the Edel 800 AFB & AVS have 1.75" bores. They are a completely new design with new boosters.

 

[Bee1971]

Edelbrock Quality Control

Post 72 primary circuit

My post about the secondary circuit on another

Another thread under "tuning" about the idle circuit on these new AVS2 s , carb got returned

Anyways your not going to fix casting flaws or blocked passages on a brand new carb

Other then that its been great LOL , once i went thru it a few times - Honestly great idle off idle throttle response is awesome with these annular boosters , starts awesome even removing all the choke hardware , great street carb

Where i think it might bee lacking is in the wide open RPM range - ANYONE FLOW TEST ONE OF THESE ?

Cant find a lot of dyno runs or side by side comparisons at the track running these AVS2 s carbs online

I would love to bolt up a comparable Holley or the old Thunder Series AVS 800 and do some side by side testing

That Weber Carter 750cfm competition series brand new out of the box ran pretty damn good up top on his stroker motor - Other then that weighted air door that i hate