Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

What is this square "box" for?

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spoolboy:
I haven't seen this on other images of carbs. What does this "box" do? The rear booster tube sits into it. But it's only on the passenger's side.

novadude:
I think that was unique to Chevrolet 1965-1969 carburetors (maybe just small block?).  I believe it was added to address mixture distribution on the "high" side of the dual plane manifold.  Maybe others can provide more info.

spoolboy:
This QJ is off of an 86 Dodge truck. I have 2 of them that are identical - 17085408.

I think I saw someone say it was a stop for the air door somewhere, but I made the door adjustable and it doesn't contact it even when fully open.

77cruiser:

--- Quote from: novadude on April 04, 2025, 08:37:11 AM ---I think that was unique to Chevrolet 1965-1969 carburetors (maybe just small block?).  I believe it was added to address mixture distribution on the "high" side of the dual plane manifold.  Maybe others can provide more info.

--- End quote ---

I've heard it was about mixture distribution too but I don't know what all they were on. I've only seen 2 I think & they were on early carbs.

novadude:

--- Quote from: spoolboy on April 04, 2025, 09:33:42 AM ---This QJ is off of an 86 Dodge truck. I have 2 of them that are identical - 17085408.

I think I saw someone say it was a stop for the air door somewhere, but I made the door adjustable and it doesn't contact it even when fully open.

--- End quote ---

Interesting.  I've only seen them on the early carbs.

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