Increasing cfm

[Marx3]

A friend of mine, who is an avid racer ( Buick fanatic ) is getting ready to put together a new engine. He always runs Qjets.
We have been talking about setting one up for a wild 455. Think he intends to go into the 10's or maybe lower. Pretty serious.
How can I modify a large cfm unit for this? Is it even necessary?

[carmantx]

What's the horsepower?
The Buick quadrajet from 71-74 can be set up for fast Buicks.  10's aren't a problem.

[Marx3]

Not sure about the HP rating yet. I know Cliff supports about 650 horses with a large cfm unit. Dont know if it has been touched in places...:-)

My friend is romanticizing this abit I think. He wants 900+ cfm, just for the heck of it.
I guess it aint even necesary at all...
I wonder at what displacement the large cfm units falls short... or what HP.

[carmantx]

I run mine on a 464 in mid 500 hp range and a 462 at about 500.  I built one for a 570 ci.
If I remember right, there was about 3 hp difference on dyno compared to 950.

[77cruiser]

I run mine on a 464 in mid 500 hp range and a 462 at about 500.  I built one for a 570 ci.
If I remember right, there was about 3 hp difference on dyno compared to 950.

What's the rest of your fuel system tank to pump?

[carmantx]

On the 462, I have 1/2" line from tank to a mechanical pump.
On the 464, fuel cell and braided hose with electric pump and regulator.

[Marx3]

I run mine on a 464 in mid 500 hp range and a 462 at about 500.  I built one for a 570 ci.
If I remember right, there was about 3 hp difference on dyno compared to 950.

3hp difference from a 950 cfm! cool.
Do you remember the air flap opening distance?

[carmantx]

1.30" I believe.

[Marx3]

pheew, that sure means open.
I seem to remember, that the flaps can open too much, slowing down the incoming air. Dont remember at what opening distance this happens.

[77cruiser]

Now you got me thinking that I might have mine open too far.

[Marx3]

Haha oh no!
How far does your open?
I thinks it's in the book, even?
Gotta see if I can look up the max distance.

[77cruiser]

I think I have one of them at 1.28.

[von]

What method is used to measure it?

[dlong70elcamino]

I've got mine set at the max of 1.270 on a 750 cfm unit on a built 350 Chevy works great its drag raced weekly......Dan

[Ethan1]

What method is used to measure it?

 Von,
 See if this website helps?

 http://www.mre-books.com/quadrajet/edelbrock.html