1976 D100, A833OD, 318 w/ headers & Edelbrock performer 2176 intake. Cam is unknown, likely stock. If not, something near stock. Currently has the Carter TQ 9250S that was on it when I acquired the pickup a couple of years ago. And it is shot. Wiggle the primary throttle shaft and get a whistle. Although I'm a fan of the TQ's I've decided staying with one is too much hassle for this application. Going back to a 500 CFM 2 barrel might be best but that would require buying an intake and a carb. At new prices that's approaching EFI throttle body injection like fitech, Holley, etc. So for this reason I am hoping to find a small 4-barrel (600-650 cfm) that fits the intake, is dependable, and pretty much a bolt on and go.

Looking at Eldelbrock Performers 1406, AVS2, Demon 1900 or 1901. Others? Thanks in advance for all tips and recommendations.

could go this route. https://www.amazon.com/2bbl-4bbl-adapter/s?k=2bbl+to+4bbl+adapter

I ran an Edelbrock 1406 on that same intake for my 87 Diplomat's 318 for years. Get the Mopar throttle adapter if you go that route.

The Street Demons have modern features and tunes that the tired old CarterBrocks don't. The only guys that still prefer those old carbs are the ones with no experience with the Street Demons.

Check for refurbished models on ebag.

Some information on the Street Demons:

'I haven't had any time with the new AVS yet. We sell them at work. Looks nice. What I have done is swap an Edelbrock 625 AFB for a 625 Street Demon. I found the SD on Ebay needing some small repairs and a kit cheap so I got it. So far, it's been a pretty big improvement over the Edelbrock.......not that the Edelbrock was a poor runner. Just the contrary. With the SD though, the idle is smoother, the mileage picked up, but where it really shines is the transition into the secondary barrel. It's very smooth yet very noticeable at the same time. It goes right into the secondary circuit smoothly, but you dang well know when that thing opens. It sounds good too. lol' www.forabodiesonly.com/mopar/threads/avs2-compared-to-street-demon.427541

www.youtube.com/watch?v=DPOuEOkazVc

www.speed-talk.com/forum/viewtopic.php?t=38709

www.youtube.com/watch?v=YNAlVFtUFL4

There is lots more information as well as tests out there.

Thanks Stumpy. Had not thought of that. So I add this question. Will a two barrel give me better overall performance? By overall I mean drivability, mileage, and peak performance for the combo I have below the carb.

Sniper, The Mopar adaptor you speak of, is it for the throttle linkage? Thanks for any clarification you can provide. I get the impression you think the 1406 works well on a basically stock 318. Is that correct?

Eddy 1406 or AVS2 or Street Demon would be good for that, and each has its fans.
I ran a TQ on the street and really liked the MPG/power equation, too.
No, a 2-bbl will not improve performance by any definition except MAYBE MPG...but the right foot has arguably more effect.

I have an Edelbrock on my 69 GTS 340..Runs pretty good..

I had good luck with a swap meet Holley 1850 with electric choke conversion on that kind of a regular driver small block.

i really like the T-quads, and use them on everything i own.
took me a few years to get to know them and sort them out, but i'm glad i took the time to do that.
parts may be somewhat hard to find at times, but i have scooped up quite a few over the years, [including complete carbs] plus i made a program for jets and metering rods for a CNC lathe at work, and made a bunch of those items. they seem to work great !
unfortunately, that machine used a "tape" for the program[s], and the machine has been discontinued for a ton of years.
the small "carterbrocks" work very well on several installations i have done, right out of the box. you must get the mopar throttle arm to make them work with the factory throttle cable and KD linkage.
as to better fuel mileage with a two barrel, trying to tune the factory BBD, i have had about a 40% success rate in my many attempts.
just my personal experience and opinion[s]. your mileage will vary.

I wonder how close a TQ 9080s would be to that?
I have one in the "big block" section of the classifieds here.
I also have (2) (not looking at them right now I'm not home, think this is the number)
TQ9265S. ( Original fitment was 80 truck 360) that i could possibly let 1 of, go.
Both of these are same numbers on carb.
These 9265s haven't been run since I got them back from demon sizzler (is he even still around?) having had the throttle bodies/shafts rebushed, as I remember he tweaked on the jetting while he had them. I"d have to have a little more for one of those because of what I paid to have them gone thru.
They're identical, same carb number and all, one of which will end up on my 78 fury along with the lean burn-ectomy it also needs, within the next month.

Holley makes a 650 cfm spreadbore vacuum secondary carburetor that may function like a T quad? I think it may bolt right in place of a t-quad on that spreadbore type intake? Never messed with one, but they have been around for awhile.

Used Edelbrock 600 or Carter 625 would also be fine. I actually like the Carters better, but they are old enough now it's not so easy to find a cosmetically nice looking one. Once you set them up they are very reliable.

Yes it is for the throttle linkage and required if you have an automatic, for the kickdown.

I had no issues with it on my 318. Ran it since the 90's, still have it on that 318.

As for the SD, lol. Always someone that has to jump on the latest shiny and say "look at me, ma".

I'll trade you a slightly used 1406 for your air cleaner, valve covers, and oil fill cap

Actually you'd be better with a 1403 500 cfm.

Or another option LINKY

I love this place. Thanks Tom for providing it and all the people that take their time to share knowledge and experience.

DaveRS23- Thank you for those links. That provided paths for further research. Appreciated!

Topside-Totally on the same side as you on the TQ's. As well as the right foot reality. Thanks for your input!

tboomer- Real end user experience is priceless. Thank you!

Zippy- As noted above about real world user experience. Thank you!

moparx- I'll just say some of us were not wise enough to gather TQ supplies while they were still available. Would love to run one. I know them. But much easier solutions are available for a mutt like this pickup is. And of course part of why the Demon caught my interest. Very similar, and maybe some advantages. Need to study more.

volaredon-Will send you a pm shortly

Neil-I've searched multiple times for spread bore. The only new or rebuilt stock that comes from the major suppliers is Q-jets. Nothing for Holley leading me to think the one you speak of is not currently in production. In agreement with you on the older AVS's & AFB's but they suffer they same availability issues as the TQ's as you note.

Sniper- Thanks again for your further input and like those above the real world experience is invaluable. I get your point on the SD, but its worth a look and compare.

TJP- Sending you a PM as well.

Thanks again all for your time and responses. So much better than internet reviews and sales pitches.

I have been running an 800 AVS for years. For you application a little AVS2 would be fine. My personal experience with Demon was from 2009. 825 mighty demon. When I got it is was brand new and had metal slivers throughout the carb. All the air bleeds slots were striped like a ham fisted monkey installed them. After cleaning it out, I really liked the carb, remember this was quite a long time ago and quality control could have improved but I personally would not get another Demon carb.

Ummmmmm, the Demon that you are referring to was a completely different one and from a different company than the new Street Demons. The new Street Demons are from Holley and were designed by a retired Carter engineer similar to the ThermoQuad. You can clearly see the resemblance.

www.holley.com/products/fuel_systems/carburetors/demon/street_demon

For the guys that haven't ran ANY Street Demons, how on earth can you recommend another carb over them? If you have ran them and had other carbs do a better job, then that is one thing. But to recommend others over the SDs without having ran them is kinda hard to buy into.

On STOCK engines, the SDs are the best OOTB carb I have ever installed. And like some of you, I have installed lots of CarterBrocks and Holleys on our engines. And let's be clear here; on modded engines, there are better choices than the Street Demons. But the Street Demons are darned hard to beat on the stock to mild engines for guys that want as bolt on and go as you can get OOTB.

Dave...My Edelbrock 1406 works quite well my my slightly modded 340. If I wanted more performance I would step up to a larger carburetor. I bought my 1406 at a swap meet for 25.00 and put a kit in it. It runs just fine without dropping 500.00 for a new carb. Perhaps something the O.P. to think about? A good friend of mine here who is a 4-speed junkie once said it is real easy to spend someone else's money here. Just a thought...

I guess that I don't understand the particular point that you are trying to make.

"Although I'm a fan of the TQ's I've decided staying with one is too much hassle for this application. Going back to a 500 CFM 2 barrel might be best but that would require buying an intake and a carb. At new prices that's approaching EFI throttle body injection like fitech, Holley, etc. So for this reason I am hoping to find a small 4-barrel (600-650 cfm) that fits the intake, is dependable, and pretty much a bolt on and go."

First: The OP likes the ThermoQuad style of carburetors.
Second: The OP wants "a small 4-barrel (600-650 cfm) that fits the intake, is dependable, and pretty much a bolt on and go."

What fits those requests better than the Street Demons? Your swap meet CarterBrock needing a 'kit' does not. Your example is apples to oranges.

You say you are happy with your CarterBrock. Two points on that: First you say your engine is modded. That is different than the OP's application and may, in fact, favor the CarterBrock. Second, have you tried a Street Demon to see if it is a better fit for your combo even though it is 'slightly modded'?

And lastly, Street Demons are on the bag for $100 to $400, you don't have to spend $500. So comparing an exaggerated new price to a swap meet price is again apple to oranges. And wouldn't you think there is a valid reason why the CarterBrocks are so cheap? Cheapest is not necessarily the best, especially when it comes to carbs and even more so when when the preference is for "a bolt on and go" carb.

Just another couple of thoughts.

LOL

Someone is stretching hard to push a street demon.

Cheap street demons on Ebay. Probably needs a kit. Probably a reason they are cheap.

Any out of the box universal fit type carb needs tuned to work best, ANY.

Claiming a SD works "out of the box" is no different than the same claim made for an 1406 or an 1850 for that matter.

Wrong as usual there sniper troll.

And the claim is that they work better OOTB than most any of their competitors. Not that they are 'perfect' or that they would never need any tuning. There are valid reasons why the Street Demon is a better choice than many of their very dated competitors. But you don't seem to know about any of that.

The Street Demon just happens to perfectly fit the OP's preferences. That is the ONLY reason that I bring them up. I even narrowed their preferred application substantially. They are not the end all, be all of carburetors. But they do fit the O.PO.'s preferences better than any other carb that I know of. I most certainly would NEVER recommend the CarterBrocks to anyone hoping to 'bolt on and go'. All you have to do is to look at their tune chart for the rods and mains and most guys would run the other way. Then there's the lack of ability to tune the transitions without a drill and bits. They are not a bad carb in and of themselves, it's just that there are better choices for applications like the O.P. But, if you haven't ran them on different combos to see how they work, it's understandable that you wouldn't know that.

If you know of a better fit for the O.P., then by all means, bring it up. Otherwise, you are just being yourself................as usual.

And by the way, the Street Demons new are about the same price as the CarterBrocks that you mention. And used are about the same price too. Depending on condition. So, who's stretching hard now?