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So what is the point of the discussion? to talk theory, or application?

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How is it that nobody makes a good single plane 6 pack intake?

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On a large enough engine, with a big enough draw, who is to say it won't pull 3 inches? or even more? If it does that, then the 1350 capacity is now reality. I would say on a big enough engine, with cam, and high rpm, it should be possible.

So what is the point of the discussion? to talk theory, or application?

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Here is an easy way to TRY and explain it. I am building a hot street 440 with a six pack. The carbs are here now.
The venturi and butterfly measurements of the two 500 cfm two barrels carburetors is exactly the same as the customers current 850 four barrels.
So whatever the 350 carburetor would flow compared to a four barrels is the only gain.
I will make a post later about the intake, porting, etc
Keith

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Understanding the 6 pack CFM is one of the hardest things for Mopar guys. A really big percentage of them will never figure out the whole 2bbl flow rating thing. I gave up correcting people a few years back but I'm glad to see that you're still putting up the good fight!

The equiv flow rating of 900+ cfm is enough to make really good power, it is the twists and turns inside of the stock intake that kills the combo. Especially at high rpm and/or lots of cubic inches. But the setup can easily make 600 hp on a healthy short block so it does work really well up to a point. And that point is more power than what 99% of the folks need on a street car anyway.

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Understanding the 6 pack CFM is one of the hardest things for Mopar guys. A really big percentage of them will never figure out the whole 2bbl flow rating thing. I gave up correcting people a few years back but I'm glad to see that you're still putting up the good fight!

The equiv flow rating of 900+ cfm is enough to make really good power, it is the twists and turns inside of the stock intake that kills the combo. Especially at high rpm and/or lots of cubic inches. But the setup can easily make 600 hp on a healthy short block so it does work really well up to a point. And that point is more power than what 99% of the folks need on a street car anyway.

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Well said.

Another way of looking at it is this;

- at the 450 - 500hp level the stock six pack setup is one of the best setups available and makes more average power and torque than all but a couple of the best aftermarket intakes and 4bbls. It's far superior to the factory 4bbl manifold and carb yet people always want to compare the stock 6 pack set up to and aftermarket 4bbl.

- After that level, you are giving something up to run the 6 pack but that doesn't mean you can't make 650 or 700 hp with one as evidenced in this thread. It's kinda like headers; at this HP level, you'd be able to make more power with a good 4bbl intake and carb but it depends on how you view it: do you want max power for your particular engine or do you want to make your target hp (whatever that is) using a 6 pack.


Dave

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I'd think with some clean up work and a good tune on the carbs he'll be fine. I wouldn't just drop a out of the box unit on and think it will be fine. There are some tricks you can do w/ the outboards that make them run better or he can bite the bullet and get the outboard metering plates. I don't have near the build but I do enjoy getting 15mpg and running mid 11's (low 11's soon)

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I have the ProMax metering plate in my center carb


and the jet-able metering plates for the end carbs


I also have the splayed-idle screw base plate for the rear carb


All I know is it pulls like a freight train and drives great. I have a mild cam, 10:0-1, Edlebrock RPM heads, MSD ignition, and TTI exhaust. 4 spd and 4:10 gears.


Fun doesn't begin to describe it

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How is it that nobody makes a good single plane 6 pack intake?

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Try a Weiand S/S intake, tunnel ram-single plane type. End carbs are like the size of a 800 dp and i guess the middle should be close to a 600. So 800 + 300 = 1100 would be more likely, unless those four barrels don't flow what they advertize either. I would say six barrels should flow a lot more than any four barrel except the dominator. Good test for you flow bench guys, just flow half of a four barrel, say an 850 then the six pac two barrel at the same rate to clear the air.
,

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this 493 was 595hp and 650ftlbs with a shop 950 and Performer RPM. I'm going to run the sixpack because I already have the intake and carbs

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