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#1 |
Registered User
Join Date: Feb 2007
Location: Cali Central Coast
Posts: 5,191
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1980 Quadrajet
I checked the numbers on the Quadrajet that is on the motor I'm gonna put in my '67, (a 350) and found that it was built in late '79, with California emissions, and was for a manual tranny (I'm gonna run a 4-speed). The P.O. said the motor ran great, but I never heard it. It was in a '79 Blazer, so it had to be smogged from time to time here in California. It is worth leaving on the motor and seeing how it runs, or swapping it out now? I'm not sure how much the smog stuff will actually affect the carb.
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'67 SWB Fleetside ZZ4/350/Tremec 5-speed/4link/Scott's IFS - and fun as heck! SOLD ![]() Click here to support the board Philippians 4: 6-7 |
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#3 |
Senior Member
Join Date: Feb 2005
Location: Maynardville, Tn
Posts: 3,030
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Re: 1980 Quadrajet
I don't see any reason not to run it. You may need to re-jet it or change the power valve spring but it still just mixes air and fuel.
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SEMA Network- Protect our Hobby! 71 C30 in pieces, starting to come together. Click here for A Place For Tennessee Truck Enthusiest To Meet |
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#4 |
Senior Member
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Location: Studio City, Calif.
Posts: 2,873
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Re: 1980 Quadrajet
Does it have idle mixture screws? That was one of the smog carb changes (we're talking California here);you couldn't adjust the idle unless you drilled out a plug or removed a limiter cap,but I'm not aware of any other negative aspect to these carbs.They were part of the CCS (Controlled Combustion System) which set a leaner mixture,higher engine operating temperature,and heated (100F) air intake.
I think I'd try it out and see how it works before deciding.
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'69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, stereo speakers, 2nd owner, Work-Truck supreme. Last edited by WorkinLonghorn; 09-24-2007 at 10:21 AM. |
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#5 |
Senior Member
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Location: Saskatoon,SK,Canada
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Re: 1980 Quadrajet
The 79-80 q-jets were the best q-jet for all around performance and drivability. They are THE years to rebuild and use. They had them pretty well sorted out and then went on to those computer controlled q-jets and then efi. I personally sought out just that same carb to rebuild and use. A slightly better choice comes off of a 79-80 Z28 or vette.
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Saskatoon, Saskatchewan Canada Last edited by StingRay; 09-24-2007 at 10:13 AM. |
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#6 |
Senior Member
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Location: Saskatoon,SK,Canada
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Re: 1980 Quadrajet
I guess I should qualify that yes the idle air caps were removed and the jetting and rods/spring were optimized in my rebuild. It's the best core to build from though. The electric choke is a big plus for carb retrofitting too.
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Saskatoon, Saskatchewan Canada |
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#7 |
Registered User
Join Date: Feb 2007
Location: Cali Central Coast
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Re: 1980 Quadrajet
Thanks for the good info, guys. I'll clean it up and see what it does.
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'67 SWB Fleetside ZZ4/350/Tremec 5-speed/4link/Scott's IFS - and fun as heck! SOLD ![]() Click here to support the board Philippians 4: 6-7 |
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#8 |
Sisyphus was my mentor!
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Location: Carleton Place, Ontario CANADA
Posts: 984
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Re: 1980 Quadrajet
StingRay is right - In terms of QJets, those are the best. I have a few that I've nabbed for future projects. A rebuild, new throttleshaft bushings & knock those plugs out & its a great carb.
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passthebuck ![]() #5642 -TWO 1967 GMC 910's. One with L6/3-on-the tree and the other with 355 w/435hp & a 700r4. -a 2013 Honda Civic as my "sensible" car |
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#9 |
Account Suspended
Join Date: Aug 2007
Location: Austin, Tx
Posts: 81
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Re: 1980 Quadrajet
Ditto to PASSTHEBUCK. These carbs are hard to beat for a street truck, and can be made to run on the strip. THey offer better economy than Holley or other square flange carbs, and really go when those big secondaries open up. Keep a good fuel fliter on them and they will outlive you. There is a book on modifying these "Modifying Quadra jet carbs " or something to that effect, I have had it for yrs, forgot where I got it but I think they are on AMAZON.COM now. The book is worth its weght in gold.
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#10 |
Registered User
Join Date: Sep 2007
Location: Columbia, MO
Posts: 9
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Re: 1980 Quadrajet
Rebuilt it! We have the technology we can make it better stronger faster. You will need the serial numbers off it or even better take the husk in with you to the auto store for a rebuild kit. (Get the correct one they can NOT be returned once opened.)
Give your self plenty of time and an organized workbench. The secret: it is easy if you take your time and have a "clean" area. This is the rebuild of a 71 Rochester QuadraJet. |
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