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I didn't see an order come in?

We modify the rear vacuum breaks as NOTHING currently being sold will allow the secondaries to open smoothly.  The ones currently being supplied so not have the correct restriction in them and will not prevent the secondaries from causing stumble/hesitation/bog when you go to full throttle.......FWIW....
Diagnose a Quadrajet carburetor problem / Re: Quadrajet - High Idle
« Last post by jmabrao on December 14, 2017, 08:45:31 PM »
My carb has front and rear vacuum breaks, the secondary damper is attached to the rear break. So I ordered a new front and rear vacuum break, should be here in a few weeks. I have noticed a bog if you stomp the throttle too quickly.
Diagnose a Quadrajet carburetor problem / Re: Quadrajet - High Idle
« Last post by Cliff Ruggles on December 13, 2017, 04:52:34 AM »
The vacuum to the distributor was routed thru a check valve and delay valve, so basically it will act pretty much like ported vacuum even when supplied by the manifold vacuum source.

What unloads the choke on a cold start and holds the secondary flaps closed if you removed the rear pull-off?

Many of those carbs were rear only, some had a front pull-off, but in most cases it just unloads the choke but doesn't dampen the secondary airflaps to prevent stumble/hesitation/bog going quickly to full throttle.......Cliff
Send it back and get one of our SR rebuild kits here:

The cheap kit from Advance Auto parts will not come with a new closed cell nitrophyl float, fuel filter w/spring, complete ethanol compatible accl pump with new springs, secondary plastic cam/spring, thicker/improved material main body to airhorn gasket, 1/4" thick non-stick carb to intake gasket, new power piston retainer, and correct diameter Viton needle/seat assembly.

Basically those kits are "generic" and very low quality parts.  Good results start with good parts and correct settings.  No need to doom the project before you get started on it.

I'll add here that at least 1/3rd of what we do here is have folks send us troubled carburetors that were just "rebuilt" or "restored" elsewhere. 

Besides some shoddy craftsmanship and lack of attention to detail, 9 out of 10 were assembled with cheap parts and almost every single one the cheap "blue" pump seal had already failed.......FWIW......Cliff
You'll get a much better and additional parts with,  such as a new float with one of CLIFFS kits.
I have a rebuild kit coming from advance Auto. I know the kit comes with instructions but I've never done a carb before and I'm nervous I'll screw something up. How much would I be looking at for you to rebuild it cliff?
Diagnose a Quadrajet carburetor problem / Re: Dual quads
« Last post by chance on December 12, 2017, 11:33:11 AM »
OK thank you! The 350 crank is grooved pretty deep so I'll be making even lighter than it already is. sounds like I better get another crank. Thanks for the always your the man...LOL
Take care!
God Bless!!
Diagnose a Quadrajet carburetor problem / Re: Quadrajet - High Idle
« Last post by jmabrao on December 12, 2017, 09:09:48 AM »
I may have looked at it incorrectly it seems. Here is the sticker, I did remove the rear vacuum break.
Dialing in your rebuilt Quadrajet carburetor / Re: 7029202 Build
« Last post by Cliff Ruggles on December 12, 2017, 03:28:04 AM »
Things will get better when you go back to the stock MAB sizes.  This will put more fuel in the engine right off idle, part throttle, and heavy part throttle.

Then all you have to do is to make sure it has adequate idle fuel and bypass air to stay on the idle system and full control with the mixture screws.......Cliff
Diagnose a Quadrajet carburetor problem / Re: Dual quads
« Last post by Cliff Ruggles on December 12, 2017, 03:00:46 AM »
The crankshafts are the same dimensions, just different balance.  Replacing it would depend on if it needs heavy metal added to work with a 400 spinning assembly.

CC the 061 heads they may have small enough chambers you don't need a domed piston in it.  I do NOT like or used domed pistons in Pontiac engines, they work much better with flat top pistons due to the flat chamber floors, machined chambers, and 30 degree intake seats.....Cliff
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