John one of the resone you dont open al 3 carbs in a lockt linkage is fuel consumtion but if you recurved the carb i gues you could but thats the resone there is a progresive linkage in a normal multipel carb system regarding your statement on that the BG six pack set flowing less than the original or 82-83 carbs you are wrong if you put al 3 carbs together and compare becas the BG will out flow both sets but for some resone BG state there flow rate wet and Holley dry mabee you have a to lean fuel curve on fast throttel opening or your retracted electrode on your sparkplugs dont like the low rpm or maybe you runners in the intake are to big for low rpm flow !? a stroket b&rb block almost always responds positive to more fuel and i stay away from rectrakted plugs on street and strip engine becas they only work great on hi reving engines if you realy whant max power out of the engine you need to race against the clock on the strip and try to jet up or down on the strip regardles of what the wideband say !

You are still missing my point. You are obviously well-informed. It's all good. My tune is fine.

If you say 3 - 250cfm rated BG carbs flow more at 3" of vacuum than the three Holley's 960 cfm rated do at the 4-barrel rated measurement of 3" of vacuum; I'm not going to argue with you about that. You might have better measuring equipment than BG or Holley.

However you came up with your flow ratings, the physical size of the throttle openings are in the BG's, are physically smaller, which is what I originally said. I understand that you believe they flow more, and you could very well be right. But, we are continuing to have some sort of communication issue, which is ok. It sounds like you are having great success with whatever it is you are doing, and I always enjoy hearing about Mopars being hot rodded in other countries.

You sure you have the right outer carbs mine are exactly like a 850dp, and the throttle blades are the thin type with slabbed shafts, stock 6 pack carbs have thicker throttle plates with full round shafts.

John im gona try to explain this one last time then i give up !

Barry Grant mesiure and rate there wet flow and Holley mesiure there rate dry flow ! There is a hughe differens in numbers as if you rate the flow wet the numbers falls down compared to dry flow as Holley do so the numbers you are refering to if they are corekt (250cfm) is a wet flow !

I can reashore you that i do know what im doing and have been doing for the past 15 years on race car engines in development and inproving them.

Reply to ademon !

Im pretty sure but im not home ! Im dead shore they are the DC sold list number 82-83 carbs and i do have two NOS sets that never had fuel in them and one NOS throttel linkage that are realy rare to find ! I will look close at them when i get back home again. Do you know the size of your throttel blades ?

Ok, Ok, since you keep wanting to focus on every issue but what I am talking about, I did some quick research on the flow ratings of both carbs.

There is at least a 210 cfm difference between the stock Holley carbs compared to the BG's, and possibly even more of a difference between the mechanical secondary DC carbs, especially with a milled choke horn. So, its also a commonly accepted fact in all the information I found that a wet flowed BG 750 4-barrel is the equivalent of a dry flowed 850 Holley 4-barrel. If this holds true, your still only talking about 100 cfm more.

If that is in fact the case, then there is no way the BG's flow more. There is a 210 cfm difference between the 960 cfm dry flowed Holleys and the 750 cfm wet flowed BG's. Maybe you've out research both Holley and BG in your 15 years of experience, but you haven't convinced me at this point, but then again you already gave your last gasp attempt at educating me. I do appreciate your efforts, and assure you I mean no disrespect.

John im just trying to tell you the facts ! I dont know were you find your numbers to compare and witch carbs of BG six shooter you find numbers on becas he made some for Chevy sb that maybe is smaler i dont know but i flow tested the so caled 500cfm Holley stock outboard carb and compared that to the flow test i made on the outer BG carb and the BG carb flowed about 4cfm less than the Holley did al in a flow bentch but the center BG carb is as big in the venturi as the outboard BG´s so what im still trying to tell you is that if you put al 3 carb together the BG carbs must flow more on full throttel than the Holley stock set as the center Holley stock carb is smaler than the outer as it is rated at 350cfm. The ones i use were sold only for Mopar engines and sold thru INDY and some other vedors like Jegs i gues.

I have not flow tested the DC carbs so i have no cold hard facts on those but i will some day !

I mean now dissrepect of any kind to you or anybody else im just trying to present the facts i found out in a flow test but you still say that it isent so ! If you still dont beleve me flow test your self !?

This is starting to get realy rediculess so i rest my case here and now.

Good enough. Thanks for posting.

Ok John here it goes,

I have now flow tested the NOS over the counter DC sold 82&83 carb for you and spent some money doing it but i can live whit that !

Al numbers are cold facts and you are welcome to do the test your self. Al dry flow test have been done at 28" and in same place on same fixture.

The DC center carb flow 326,4 cfm and the outboard flow 553,6 cfm so that set of al 3 carbs will flow 1433,6 cfm.


The out of the box BG six Shooter carbs for Mopar flow 510,5 cfm on center carbs and outboard carb flow the same so al 3 carbs together will flow 1531,5 so yes i whas right al along the BG flow more.

I also flow tested the stock replacement outboard carb for 440 and it whas 532,6 cfm but i dont have any spare stock center carb that i can test at this moment.

Hope this whas educating and thanks for posting.

That thinking doesn't matter.........OF COURSE the Holley jets aren't sized as the #`s say because they use the LENGTH and TAPER on the inlet/outlets of the jets for flow. Kinda like vacuum at idle and pv`s...........

How come stroker 6-pack guys don't look at the Holley 4412's for the center carb? They flow 500cfm out of the box.... And them roundy, roundy, guys have a few outlaw carbs that flow well over there 500cfm rating cfm. Just mill off the round back section so that the six pack base can sit on top call it done and few look twice?

Just wondering.....

There are more than one street sixpak set up running like that In fact Holley use to make a 600 CFM two barrel for roundy round racing that had no venturi boosters in them at all, the fuel was fed through the sides of the main body
The Carb Shop in Ontario,CA was buying those 500 CFM carbs. new and converting them for six paks many years ago back in the early 2000s

Thanks, if I were doing any 6 pack, big or normal that's the direction I would go in (4412) and no one would be any the wiser. I see 4412's going for dirt cheap on flea bay. You could even send it out for a tweek or two and still be into it cheaper than a new 2300 center pot.

Even the hard core six-pack guy's don't catch them, even when there starring directly right at them 2ft away.

That's my .02 worth.

Them 500 cfm 2 barrels don't work on strokers ... my new 511 I just built

SHHhhhhh, I wasn't going too tell anyone.. Back too your hole!

Cab i whas considering the roundy carbs when i whas looking for carbs that could breath better and mostly the center carb that realy made my stroker more alert up to 3200rpm so the throttel response inproved alot ! I just found these BG on Fle Bag first and became intrested as they are more uncommon i gues !

I even tryed to find some more cfm on the outer carbs by stratening out the venturi on those in a spark machine but i only made about 17 cfm doing that stunt

I was under the impression that the BG six pak carbs flowed less than the stock Hollet six pak carbs did I'm glad you helped straighten that myth out Thanks a LOT

My six pack had a 4412 center carb.

And Barry Grant is a hack

I don't think the 4412 has the vacuum hose provisions for diaphragms on secondary end carbs; now mechanical sec. end carbs yea they may be a good choice.