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06-22-2009, 11:59:34 PM
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#1
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Lifetime Gold Member
Join Date: Apr 2007
Location: So. IL
Posts: 479
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What can you tell me about this quadrajet?
Got this off of an engine I bought. Was already pulled out of the truck when I got it.
Looks to be a recent rebuild and all the shafts move like a dream
I want to put this in place of my wore out quadrajet on my recently acquired truck
My truck has an electric choke but there arent any wires hooked up. Has what looks to be a new choke cable installed but not hooked up to the carb
I was under the impression that all quadrajets had the black plastic circle where the choke went whether or not they were electric or manual
Is this tiny arm opposite the side with the throttle the choke arm?
Would I need this open or closed when the choke is engaged?
What appears to be missing on this carburetor to put it in the truck?
__________________
1979 K10 Scottsdale
1998 Silverado Z71 extended cab
2002 Pontiac Grand Prix GTP 40th anniversary coupe
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06-23-2009, 02:19:16 AM
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#2
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Veteran Member
Join Date: May 2003
Location: Kingman, AZ
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It looks like it's missing the whole vacuum setup to open the secondary choke ...
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The first digital hijinx I designed was quite naturally perfect. It was a work of art. Flawless. Sublime. A triumph only equaled by its monumental failure.
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06-23-2009, 04:45:18 AM
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#3
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Lifetime Gold Member
Join Date: Apr 2007
Location: So. IL
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I think the original's got one
I dont know anything about these things but I gotta put it in the truck. The other one, the linkages are all messed up, no choke so you have to keep foot on pedal for a few minutes after starting cold or it will die
__________________
1979 K10 Scottsdale
1998 Silverado Z71 extended cab
2002 Pontiac Grand Prix GTP 40th anniversary coupe
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06-23-2009, 08:40:54 AM
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#4
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Veteran Member
Join Date: Nov 2000
Location: Philly area
Posts: 10,814
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That's an older 74-down QJet that would have used a divorced choke coil mounted on the intake manifold'e exhaust crossover. Inside it would use B-style primary rods. You're missing the vacuum pulloff that would go on the front/passenger corner of the carb plus the rod that goes from that pull-off to the secondary air door arm. Secondaries won't operate properly without that.
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1990 454SS pickup. Original "tow truck motor" 454 upgraded to something a little more "aggressive." Seems pretty stout but the fuel bill is nuts.
78 Malibu. Inherited with only 35K on the odo! Mild 383 with Weiand 142 blower on top. Mid 12s appears to be the best it's gonna do on street rubber. Runs so good I may never drive it again.
"Last remaining QJet tuner on planet Earth!"
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06-23-2009, 09:00:54 AM
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#5
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Gold Member
Join Date: Sep 2004
Location: Southern Maryland
Posts: 8,144
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If your truck uses an electric choke, skip that carb altogether. That carb also doesn't have the adjustable part throttle that the later carbs will have.
__________________
Steven H. www.carfap.net
1985 BMW 745i Turbo, Euro model import, 18" Antera wheels
1986.5 Porsche 928S, 5.0 32v V8, 18" 993 turbo wheels
1988 K1500, 5.7 TPI swapped
1999 C1500, new 5.7 Vortec, 4" lift spindles, EFILive V2 tuner
2003 Mercury Marauder, 4.10s, Heinous billet rear control arms, SCT Advantage III tuner
2004 Taurus SEL, Ingalls tubular control arms
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06-23-2009, 12:54:26 PM
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#6
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Veteran Member
Join Date: Aug 1999
Location: ohio
Posts: 9,570
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Very early carb looks like. Might check numbers, could be valuable to somebody?
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06-23-2009, 01:46:42 PM
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#7
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Lifetime Gold Member
Join Date: Apr 2007
Location: So. IL
Posts: 479
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Quote:
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Originally Posted by tom3
Very early carb looks like. Might check numbers, could be valuable to somebody?
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You think someone would be looking for something like this?
I do like to help out and see some correct cars at car shows
You think it'd be at least worth a good working carb?
Engine wasnt all original. IIRC its got 73 heads and the pistons look tempered so im sure the heads got warped at one time. Came out of a 79 K10 and supposedly is the original block to the truck but who knows
What do I gotta do to get it run like its supposed to?
__________________
1979 K10 Scottsdale
1998 Silverado Z71 extended cab
2002 Pontiac Grand Prix GTP 40th anniversary coupe
Last edited by Chevy 350 : 06-23-2009 at 01:51:23 PM.
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06-23-2009, 02:02:06 PM
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#8
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Veteran Member
Join Date: Jan 2007
Location: Cedartucky
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It'll be a pita to tune. That's all i know about Q jets.
I'd trade that or sell it and avoid the headache.
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06-23-2009, 02:44:52 PM
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#9
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Lifetime Gold Member
Join Date: Apr 2007
Location: So. IL
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__________________
1979 K10 Scottsdale
1998 Silverado Z71 extended cab
2002 Pontiac Grand Prix GTP 40th anniversary coupe
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06-23-2009, 02:46:13 PM
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#10
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Lifetime Gold Member
Join Date: Apr 2007
Location: So. IL
Posts: 479
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__________________
1979 K10 Scottsdale
1998 Silverado Z71 extended cab
2002 Pontiac Grand Prix GTP 40th anniversary coupe
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06-23-2009, 07:06:01 PM
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#11
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Lifetime Gold Member
Join Date: Apr 2007
Location: So. IL
Posts: 479
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Then WTH am I gonna do?
The carb in th truck is so worn out the shaft holding the valves for the primaries is worn so gas leaks out the side
Cant I just manually operate the choke with a push/pull knob/cable deal? Theres already one in the truck
__________________
1979 K10 Scottsdale
1998 Silverado Z71 extended cab
2002 Pontiac Grand Prix GTP 40th anniversary coupe
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06-23-2009, 08:30:18 PM
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#12
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Veteran Member
Join Date: May 2003
Location: Kingman, AZ
Posts: 4,898
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Quote:
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Originally Posted by Chevy 350
Then WTH am I gonna do?
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Get a carb that works in that application??
__________________
The first digital hijinx I designed was quite naturally perfect. It was a work of art. Flawless. Sublime. A triumph only equaled by its monumental failure.
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06-23-2009, 09:53:18 PM
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#13
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Gold Member
Join Date: Sep 2004
Location: Southern Maryland
Posts: 8,144
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ALL quadrajets wear the throttle shaft out if they have more than like 50k miles on them
Your gas leak out the throttle shaft is a float level or needle/seat issue. Even if the primary shaft is worn fuel should never "leak" out there. You have a greater problem w/ that carb than just a worn throttle shaft.
__________________
Steven H. www.carfap.net
1985 BMW 745i Turbo, Euro model import, 18" Antera wheels
1986.5 Porsche 928S, 5.0 32v V8, 18" 993 turbo wheels
1988 K1500, 5.7 TPI swapped
1999 C1500, new 5.7 Vortec, 4" lift spindles, EFILive V2 tuner
2003 Mercury Marauder, 4.10s, Heinous billet rear control arms, SCT Advantage III tuner
2004 Taurus SEL, Ingalls tubular control arms
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06-23-2009, 09:54:18 PM
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#14
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Lifetime Gold Member
Join Date: Apr 2007
Location: So. IL
Posts: 479
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Yeah. Thats why Im not even going to try and rebuild it
__________________
1979 K10 Scottsdale
1998 Silverado Z71 extended cab
2002 Pontiac Grand Prix GTP 40th anniversary coupe
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06-23-2009, 09:58:51 PM
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#15
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Gold Member
Join Date: Sep 2004
Location: Southern Maryland
Posts: 8,144
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I have gotten known original very low mileage take off q jets and the throttle shafts are still egged out. There is just very little surface area of that tiny shaft bearing on soft aluminum.
The only way to get a tight throttle shaft is to buy the reamer and bushing tool kit or have a carb shop do it
Your qjet probably just needs a rebuild kit to work fine. You gotta be willing to take the qjets apart
__________________
Steven H. www.carfap.net
1985 BMW 745i Turbo, Euro model import, 18" Antera wheels
1986.5 Porsche 928S, 5.0 32v V8, 18" 993 turbo wheels
1988 K1500, 5.7 TPI swapped
1999 C1500, new 5.7 Vortec, 4" lift spindles, EFILive V2 tuner
2003 Mercury Marauder, 4.10s, Heinous billet rear control arms, SCT Advantage III tuner
2004 Taurus SEL, Ingalls tubular control arms
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