six pack carb question

Getting ready to purchase a Holley six pack carb setup for a big block.
I have heard that some have used the 340 six pack carbs, and some using the 440 center carb and 340 outboard carbs.

I would love to get some feedback, and who is the leading authority here on 6 pac induction.

Thanks for your help

Get the list number off the carbs....

440 center carb 0-4144-1
outboards 0-4365-1

340 center carb 0-4792
outboards 0-4790

I looked up the numbers Summit

Hope this helps and thanks

Silly Rabbit, we ALL are of course!

I put Holley 340 center and outboards on my 383. Mopar Performance reccomended 440 center and 383 outboards for B Blocks, and the only difference I could see between the 440 and 340 centers was the main jets.
I pulled the 61 jets out and installed 63's as reccomended by the six pack tuning tips. Stock '70 383 Magnum, Stock manifolds and 2-1/2" exhaust. Motor runs nicely now. Holleys are about $100 less each than the Mopar Performance carbs, and the 340 center less than the 440. Jets are $6 a pair.

http://www.mopar1.us/6barreltips.html

Buy the BB carbs, do not mixed them with the SB smaller center carb, you will always be sorry if you do remeber that BB love air and fuel, more air and fuel, more power the right foot determines how far the carbs. open up to wide open throttle I love six paks

I thought the center carbs were the same CFMs, at least the factory carbs, am I wrong?

http://documents.holley.com/techlibrary_carb_numerical_listing.pdf

4144 for the 440 and 4792 for the 340. Both are 350cfm.

https://holley.com/products/fuel_systems.../parts/0-4144-1

https://holley.com/products/fuel_systems...rs/parts/0-4792

I'm sure that the stock 1970 340 carbs, automatic and stick shift, CA and non CA carbs. flowed 300 CFM from Holley on Mopar production 340 C.I.motors, not 350 CFM like the original 1969,1970 and 1971 model productions OEM 440 carbs did I know several NHRA stocker racers that had a bunch of different original OEM 340 and 440 carbs, none of them ever said that all the center carbs. they had flowed (a bunch of them) for both motors flowed the same for the BB and SB motors In fact, I've seen stocker racers switch the center carbs. after qualifying at NHRA major races, before being tech. or sealed up for tech. Lots of misinformation out there

Cant tell you about actual flow numbers but pretty sure they were advertised as the same. I am reasonably sure the 440 pulled more from the secondaries than the 340 pulls.

Discussion on this subject:

http://www.cuda-challenger.com/cc/index.php?topic=106024.0

And some incorrect information .