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Quadrajet Carb Talk and Tips / Re: Quadrajet choices
« Last post by davel on Today at 03:50:02 PM »
Interesting. The specs in the picture are a little blurry but I got the idea. Are you getting the vacuum/boost readings from the engine side or caburetor side of the turbo charger? I'm guessing your gauge is mounted to the engine side as there would be no boost on the carb side...
Quadrajet Carb Talk and Tips / Re: Cadillac carbs
« Last post by Kenth on Today at 12:06:02 PM »
Idle bypass air is added due to engine design, lots of different Quadrajets thru the years did not use any idle bypass air at all.
Also, most if not all, Quadrajets with hot air choke has a .125" channel adding bypass air and is part of the calibration.
Quadrajet Parts and Numbers / Re: 7026240
« Last post by Kenth on Today at 11:53:08 AM »
A service replacement should have 7026240 stamped were the later units are stamped.
Also the date should be stamped at the same pad, four digits, last one the year it was made and the first three is the day that year.
Also, no plant code (two letters) on the service unit.
Quadrajet Parts and Numbers / 7026240
« Last post by drhach on Today at 11:04:37 AM »
Hi everyone, new guy here. I just purchased what is numbered as a 1966 QJ for a Buick. However, I'm confused. It doesn't have the disk. There's no provision for it and the carb number is stamped in to a pad like it would be on the later carbs. It doesn't look like a re-stamp. I would have thought that if it were a later carb, it would be a service replacement (7041304). But that isn't how it's stamped. Could it be that this was produced after 1968 and factory stamped with this earlier number?

I guess my first concern is ordering replacement parts. Also, what should I look for to indicate vintage (if it matters)?

Quadrajet Carb Talk and Tips / Re: Cadillac carbs
« Last post by lightning boy on Today at 10:27:24 AM »
What about the tiny air bypass holes in the baseplate? How is there enough bypass air for a big inch caddy motor? Just curious.
Quadrajet Carb Talk and Tips / Re: Cadillac carbs
« Last post by lightning boy on Today at 10:23:43 AM »
Thanks Cliif.
It does have adjustable APT with a stepped primary metering rod.
I'll call for parts soon.
Just an update, I have lowered my float level from 5mm to 10mm.
When I took the vehicle for a drive I found that it now has a hesitation when the accelerator is depressed, this was not an issue before with the float at 5mm.
I had a look at my plugs and it suggests that it is on the lean side as its light brown in colour.
There is no fuel at the vacuum advance port as well.
Do you think the hesitation is due to the float level. My carb spec says float should be at 11.9mm on a stock motor which is what mine is.
My jet size is 71 with primary rods 45 B.
I have 76 jets which I am tempted to try with the float left at 10mm. Opinions?
Please assist with advice here.
Quadrajet Carb Talk and Tips / Re: Cadillac carbs
« Last post by Cliff Ruggles on Today at 06:32:19 AM »
Primary POE was used on some models to run an even leaner mixture for very light engine load to help with emissions and fuel economy.  The POE very quickly adds fuel with any quick throttle movement, much like the accl pump to help prevent a momentary lean condition.

It really doesn't work all that well and I don't really use it much.

As long as the Caddy carb has the later style APT system that raises and lowers the power piston it is an EXCELLENT starting point for a really nice high performance street/strip carburetor.....Cliff
Quadrajet Carb Talk and Tips / Engine
« Last post by hiy_po on November 18, 2019, 08:19:34 PM »
Quadrajet Carb Talk and Tips / The Engine
« Last post by hiy_po on November 18, 2019, 08:17:17 PM »
What are the engine and boost details?

Draw threw turbo
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