General Category > Quadrajet Carb Talk and Tips

Increasing cfm

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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:

--- Quote from: carmantx on September 09, 2016, 04:18:23 PM ---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.

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

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