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Help ID Quadrajet Carb? #5237327 10/11/19 06:38 PM
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methusaleh Offline OP
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Engine is not original to vehicle; we know it's a 350. Carb is going to need a rebuild but model numbers are nearly obliterated. Every known trick has been attempted to expose them, but only a few are visible. We've cleaned, attempted a contrast with paint, taken photos that had tons of light, etc.

From my research, this is likely a model 1904R. Choke is electric. There is a previous-owner-added manual throttle cable as you can see, right by the original one's location.

Any assistance is appreciated.

[Linked Image]
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Last edited by methusaleh; 10/11/19 06:38 PM.
Re: Help ID Quadrajet Carb? [Re: methusaleh] #5237343 10/11/19 07:11 PM
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xxch4osxx Offline
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Good old Quadrajet carb,very underrated by many. With someone that knows what they are doing, they can be made to perform very well.

Not sure what model that would be. Never seen one with that tall collar on it before.


2015 RAM SXT Crew Cab 5.7 with 6 speed tranny.

2008 Mazda 3 GS Sport Hatchback 5sp MT (Girlfriend's car)

Re: Help ID Quadrajet Carb? [Re: methusaleh] #5237362 10/11/19 07:35 PM
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Shannow Offline
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Love the Q-Jets


If it's the truth....it can handle the pressure !!!
Re: Help ID Quadrajet Carb? [Re: Shannow] #5237364 10/11/19 07:40 PM
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4WD Offline
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Used to flip over the air cleaner lid on the parents 350 Chevy to hear them howl on Friday night
(and forgot to put it back once, not good)

Re: Help ID Quadrajet Carb? [Re: methusaleh] #5237381 10/11/19 08:07 PM
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Kansas_Ron Offline
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2000 Chevy Prizm
2015 Honda Civic
2017 Hyundai Elantra
Re: Help ID Quadrajet Carb? [Re: Kansas_Ron] #5237404 10/11/19 08:36 PM
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methusaleh Offline OP
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That's the page I found as well. I have cleaned that area, applied paint and then scraped it off (leaving residue in the number stampings to make them more visible), and still I can only make out one number per row. There are two rows there as there should be.

Re: Help ID Quadrajet Carb? [Re: methusaleh] #5237416 10/11/19 08:47 PM
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JeffKeryk Offline
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That MAY be an original (non-rebuilt) Q-Jet. Is so, you have a good one.
If it has been commercially rebuilt, it could be junk.
Look up Lars Grimsrud; he is one of the last Q-Jet gurus ans a great guy.
He will rebuild it for around $200 depending on parts needed.

Lars

If your carb is junk, there are some decent options.
Holley makes a Q-Jet replacement.
I would try a Street Demon, which is an easy replacement.

Street Demon

Good Luck. I love Q-Jets; I run a Lars rebuilt on my '68 L36.

Other rebuilders are Henry Olsen (local here in San Mateo, CA) and Cliff Ruggles.

Last edited by JeffKeryk; 10/11/19 08:50 PM.

2018 Tesla Model 3, Medium Range Battery
2018 Lexus RX450h
2013 Lexus GS350 F Sport
2006 Acura TSX
2001 Tundra Access Cab, 1998 Accord LX, 1968 Corvette L36 Roadster, 1965 Olds 4-4-2
Re: Help ID Quadrajet Carb? [Re: methusaleh] #5237436 10/11/19 09:09 PM
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joegreen Offline
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Cliff ruggles has a book on quadrajets. Here is his website. https://cliffshighperformance.com/. Also check the throttle plate shaft bore for wear.


1978 Chevrolet k20
Engine: Delo 10w30xle
Transmission: Castrol transmax dex/merc

1984 Mercedes-Benz 300 turbo diesel
Engine: Delo 400 15w40le
Re: Help ID Quadrajet Carb? [Re: methusaleh] #5237463 10/11/19 09:46 PM
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clinebarger Offline
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Torx bolts + Evap vent + No mixture control solenoid= Early-Mid 80's HD 4MV.

17085213 should get you the correct rebuild kit.

Last edited by clinebarger; 10/11/19 09:51 PM.

2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/U341E
2000 Toyota Avalon 1MZ-FE/A541E
Re: Help ID Quadrajet Carb? [Re: JeffKeryk] #5237466 10/11/19 09:49 PM
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clinebarger Offline
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Originally Posted by JeffKeryk
That MAY be an original (non-rebuilt) Q-Jet. Is so, you have a good one.


It's probably been rebuilt a few times.....The Mixture Screw plugs have been drilled out.


2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/U341E
2000 Toyota Avalon 1MZ-FE/A541E
Re: Help ID Quadrajet Carb? [Re: methusaleh] #5237484 10/11/19 10:11 PM
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Chris142 Offline
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Get the block and head casting numbers and the engine i.d. numbers and letters behind the alternator. Should be able to i.d. things by those assuming nothing's been swapped around.


02 Wrangler Napa high milage 10w40
87 F250 Valvoline 15w40
07 fjcruiser Car lube plus 10w30
Z400 castrol T 10w40
Can am Maveric edge 5w40
57 case tractor Chevron sae30
Re: Help ID Quadrajet Carb? [Re: methusaleh] #5237712 10/12/19 10:20 AM
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MCompact Online Content
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The great thing about Q-Jets is how they can be tuned to a very precise degree; I still get called on to rebuild one every few years.


Mine:
2014 M235i
2009 Cooper Clubman
1999 Wrangler Sahara
1995 318ti Club Sport

Wife's:
2015 X1 xDrive28i M Sport


Son's
2009 328i

Buy what makes you smile...
Re: Help ID Quadrajet Carb? [Re: MCompact] #5237831 10/12/19 01:18 PM
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Re: Help ID Quadrajet Carb? [Re: methusaleh] #5238016 10/12/19 06:17 PM
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methusaleh Offline OP
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Thanks everyone! I am in the quest for a rebuild kit, maybe I wasn't clear on that, and trying to learn which to order. I have a mentor who is going to teach me how to do the rebuild once the kit is in hand.

Re: Help ID Quadrajet Carb? [Re: methusaleh] #5238096 10/12/19 08:07 PM
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ragtoplvr Offline
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If it has the oe plastic foam float, you want to replace it. They tend to get full of gas and cause flooding. I love quadrajets. I had a 69 impala 255 350 that I rejetted during the gas crisis . It was rather lean, and hard to drive when it was cold so I converted the AC to double snorkel with heat and manual choke so I could get off choke as soon as possible. That improved drive ability and I got even better mileage. , it still had a lean sag the first few miles. But it got great mileage for the day.I often got 20 on a 25 mile drive to college. In the spring and fall when AC not needed 21 was possible. for 75 to 79 that was pretty remarkable fuel economy. I used a delta mark 10 ignition and .050 plug gap.

I do know how to tune one for no secondary tip in sag.

Rod

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