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Quadrajet Carb Talk and Tips / Questions on a 7041242
« Last post by Mudsport96 on Today at 04:13:34 AM »
So my uncle just picked up a 1971 Buick Centurion convertible. With a supposed 55k original miles. I did some looking around the forum here, and only found 3 threads on that number and the newest thread being from 2015,  so maybe I can get a little more info today. Info that I have found being, 075" Primary Jets, 45B Secondary Metering Rods, "K" Secondary Hanger and AV Secondary Metering Rods. Now, the hanger is definitely an I hanger. So that has been changed if the K was original. I have not opened it up yet as he just wanted an initial looksee. It starts and runs/drives okay, And he needs to get the exhaust fixed as it was damaged being driven onto the car hauler.
Is there anything with this casting that I should look out for, (other than leaky well plugs of course).
Best current Pic I have as the top has a slight leak and it hasn't stopped raining this week.
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Dialing in your rebuilt Quadrajet carburetor / Re: Rear choke pull-off. Where is the orifice?
« Last post by 77cruiser on April 04, 2025, 10:53:24 AM »
I think they are past the bend.
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Dialing in your rebuilt Quadrajet carburetor / Re: What is this square "box" for?
« Last post by 77cruiser on April 04, 2025, 10:51:55 AM »
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.

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.
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Dialing in your rebuilt Quadrajet carburetor / Re: What is this square "box" for?
« Last post by 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.
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Dialing in your rebuilt Quadrajet carburetor / Re: What is this square "box" for?
« Last post by 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.
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Dialing in your rebuilt Quadrajet carburetor / What is this square "box" for?
« Last post by spoolboy on April 03, 2025, 10:31:32 AM »
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.
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Dialing in your rebuilt Quadrajet carburetor / Rear choke pull-off. Where is the orifice?
« Last post by spoolboy on April 03, 2025, 10:29:44 AM »
I have a rear mounted choke pull-off. Is the small hole in the end of the tube the orifice, or is there one further up the tube also? 

Pic of pull-off atached. There is no front pull-off.

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Quadrajet Carb Talk and Tips / Re: Air Horn Gasket question
« Last post by Brian B. on April 02, 2025, 02:45:43 PM »
I probably notice it more near the accelerator pump because that is where "excess" gasket material sticks out under the airhorn.  Its akin to a small square tab of gasket hanging out.
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Quadrajet Carb Talk and Tips / Re: Air Horn Gasket question
« Last post by DV657172 on April 02, 2025, 10:59:23 AM »
Thanks for all the replies and education.

I dont have any fuel coming from accelerator pump hole but as Brian and quadrajam reported mine also has the most wicking of fuel nearest the accelerator pump.
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Quadrajet Carb Talk and Tips / Re: Air Horn Gasket question
« Last post by von on April 02, 2025, 02:45:48 AM »
Mine wick fuel too but if it gets to the point it comes out the accelerator pump hole there's a bigger problem. Then it could be poor seal between the needle seat and carb body, needle to seat leak, wrong float level, too much fuel pump pressure (BTDT), bad float, or needle clip incorrectly installed.
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