Tri power carbs on 440 six barrel?

[33 IMP]

@POMONAMISSEL , i can't find much reliable info on those carbs, but i suspect bg rated them the same way a four barrel would be rated. Otherwise they would be so small nobody would want them, especially at their price point.
The only way to be sure would be to measure the venturi diameter, and the throttle blade size and calculate/compare area to a known four barrel.

 

[Sonny]

i just bought a barry grant six shooter setup for my driver 383 , these carbs are only 250 cfm each . should offer up good fuel mileage and good throttle response . its for my wifes cool driver . it will go into her 65 bel rag i bought her . she doesn't know about the buy . plan on surprising her with it . i've been hinting around about color and car nick names . but i have so much stuff going on . i still think it will be a surprise . what do you guys think , anyone used them ?

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How do I get that fuel log!!!

 

[POMONAMISSEL]

it was part of the barry grant setup stuff .

 

[biomedtechguy]

I was...was really excited when I was doing deep dives on "6 pak" research a couple of years ago and as an ongoing exercise, when I found the Demon/Barry Grant setups...
THEN
I found out how much LESS, a LOT LESS air and fuel they flowed vs the factory Holley 2bbl carbs. They are on a par with the Pontiac Tripower Rochester 2bbl carbs though, at around 790 total CFM.
There are actually a lot of adapter plates sold to convert the Pontiac or Chevy Tripower intakes from 3 'Chesters to 3 Holley 2bbl carbs!
If it was up to me and I wanted to go EFI on our (her) 421 in the GTO, the FiTech 3x2 EFI system would be ideal but I'd need the adapter plates. I just spent about $700 on having the Rochesters professionally and expertly extensively modified to run properly with the performance enhancement upgrades we've made to the 421, and so far, so good.
If they ever let me down and there's no "fixing" them by tuning on my end, I've reached the end of the rope with the 'Chesters and my wife screaming at me through her cell phone or in person about the carburetors and problems. Unfortunately she demands that if we go EFI, she has to have the $8K (all in, new fuel lines, pump, computer, etc) Rochester look alike EFI 3x2 system. Now I have to admit, it's beautiful, and works great, and really does look like Rochesters, but damn! From 3k to 8k is one heck of a premium!

 

[Struttmaster]

I dont know much about the six shooter setup, probably because i thought of it as a very expensive, small cfm setup for a small block chevy. I would guess the carbs would be similar to 2300 holleys. i dont know of any reason they couldn't be made to work. They might be a little small on a 440, or they might work great? I have seen tests of that setup on a 350 chevy but frankly, i dont remember any huge performance benefit, but i do remember a huge "suggested retail price". They struck me as almost three grand of eyewash for the ratrod crowd.
Edit: i do like the annular boosters, but that might be another reason the rated cfm is small.

Barry Grant 6 shooter goes well on my 496 wedge

 

[POMONAMISSEL]

i've got a set of those barry grant six pack setups , on a 383 6pck intake . how'd do you like them @Struttmaster . what idi you do about an air cleaner ?

 

[POMONAMISSEL]

since there rated at 250cfm each , 750 cfm will be fine for a a mild b motor for a good cruz'r . here's what i bought .

 

[RJRENTON]

since there rated at 250cfm each , 750 cfm will be fine for a a mild b motor for a good cruz'r . here's what i bought .

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Out of curiosity......why would go to all the hassle, linkage and fuel line adaptation to use Demon carbs....just to be different??? Why not just buy the Holley carb setup (either replacement carbs or origional carbs), rather than shoe maker off brand carbs on the manifold.....using Mopar linkage, fuel line connections and air filter assembly and have everything fit, and looks like it belong from the factory??? The origional choke setup will work. Now, you've got to supply power the the electric choke as shown.
If you really want a challenge, why not adapt eight (8) single barrel Briggs and Stratton carbs on a home fabricated log type manifold with linkage to open all 8 carbs simultaneously or some other combination.....that way you could tune each carb for best cylinder filling......you would definitely have a unique installation.......just a thought......
BOB RENTON

 

[POMONAMISSEL]

well i'm an guy with out opinions on off factory builds . if you can't think passed a different carb set up . well i've got plenty of factory type setups that as well , are you talking out of owning 6pck setups or just being a , well i meet all kinds of people during life , hope yours is going great . mine is , even with my odd carbs , oh ya that e-choke is the only way i can get a choke on a exhaust exchange plugged heads , i've even got muti car set ups , mw and inline twin fours and a weber set up . so you can see i'm not stopping at factory level packages , and even a blown wedge . thanks bob r

 

[POMONAMISSEL]

oh ya that blown motor has lp mixers on it , lp gas isn't gasoline , but just another type of fuel . these pistons n rods are for a 54 354 ind hemi with algon injection to run e85 fuel . those rods n pistons are cleaning up real nice too .

 

[RJRENTON]

oh ya that blown motor has lp mixers on it , lp gas isn't gasoline , but just another type of fuel . these pistons n rods are for a 54 354 ind hemi with algon injection to run e85 fuel . those rods n pistons are cleaning up real nice too .

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More power to you.......just not my thing......but so what......you seem to enjoy the adaptations........as long as you're satisfied.....
BOB RENTON

 

[Struttmaster]

i've got a set of those barry grant six pack setups , on a 383 6pck intake . how'd do you like them @Struttmaster . what idi you do about an air cleaner ?

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I have the stock 6bbl air grabbing base and cleaner set up with mine. Hitting the dyno in a couple of weeks. Hoping to have 500+ ponies at the wheels. Will let you know when I have the results. I went with these as I like the mechanical secondary set up

 

[RJRENTON]

I have the stock 6bbl air grabbing base and cleaner set up with mine. Hitting the dyno in a couple of weeks. Hoping to have 500+ ponies at the wheels. Will let you know when I have the results. I went with these as I like the mechanical secondary set up

WHY.....the reason being????
BOB RENTON

 

[33 IMP]

I have the stock 6bbl air grabbing base and cleaner set up with mine. Hitting the dyno in a couple of weeks. Hoping to have 500+ ponies at the wheels. Will let you know when I have the results. I went with these as I like the mechanical secondary set up

If you have an auto trans, you'll need about 600 fwhp to reach 500 wheel hp. If you're using the demon carbs, good luck getting there. Sincerely.
Then swap on a good single plane intake with a 850-1050 dp and see what happens.
I have nothing against sixpacks, I have one, and I went 6.30s with a demon gold claw.(different car), so nothing against demon either. But, in my opinion, the Sixpack Demons are too small for a big block, and too costly.

 

[Struttmaster]

More power to you.......just not my thing......but so what......you seem to enjoy the adaptations........as long as you're satisfied.....
BOB RENTON

Thanks Bob, and it doesn’t look too out of place to the non-purists

 

[Struttmaster]

If you have an auto trans, you'll need about 600 fwhp to reach 500 wheel hp. If you're using the demon carbs, good luck getting there. Sincerely.
Then swap on a good single plane intake with a 850-1050 dp and see what happens.
I have nothing against sixpacks, I have one, and I went 6.30s with a demon gold claw.(different car), so nothing against demon either. But, in my opinion, the Sixpack Demons are too small for a big block, and too costly.

Yes, my engine builder said they will be the bottle neck on power potential, recommending a pair of quads instead. There is something about

If you have an auto trans, you'll need about 600 fwhp to reach 500 wheel hp. If you're using the demon carbs, good luck getting there. Sincerely.
Then swap on a good single plane intake with a 850-1050 dp and see what happens.
I have nothing against sixpacks, I have one, and I went 6.30s with a demon gold claw.(different car), so nothing against demon either. But, in my opinion, the Sixpack Demons are too small for a big block, and too costly.

Yes, my engine builder has advised they will be the bottle neck on power potential, recommending a pair of quads. There’s something about ‘72 being the last year of the 440 6bbl that’s adds nostalgic value. We will see what the dyno says in a couple of weeks.