I think I read somewhere that at their peak there was over 300 different models. And as a 28 year marine mechanic, I have rebuilt at least 100 of the marine versions.
Glad I found this video, I have a '78 Chevy c10 /350 sb and a quadrajet 4bbl carb, likely in need of a rebuild. I'll pull the stamped code and hopefully you can point me in the right direction for a rebuild kit.
My 76 nova has the 3rd carb you described , is running like a charm but maybe on the future I will have to clean or restore ... been watching some of your videos and learning some stuff everu time thanks for sharing my man
Prob the easiest carb to rebuild. I used to hate them but god dame they work good when you know which one to use. That and they are great for fuel mileage bc the primary is smaller. Long as your not doing pulls lol cheers 🍻
Really appreciate the video. I recently inherited my grandfather's 74 GMC Jimmy. He put a 454 in her and I'm trying to figure out what parts are what year. Turns out the carburetor is an 80. Thank you again sir.
I love the Quadrajet! I would always use the 4 barrels on my engine with a turbo 350 transmission. You "KNOW" that its right when the four barrels open up and the transmission downshifts at the "SAME TIME".....
Is there a way to identify a qjet carb if it doesn’t have the aluminum tag in the circle stamp? I don’t see any other number on carb it self. And I need to rebuild it.
I have a '66 De Ville Conv. with a 429. My carb seems to have a vacuum leak, (stalling out at idle or stops, at moving speeds no problems). It does not seem to look like any of the examples, best I can tell. How do I figure it out so I buy the right part for a mechanic to rebuild it for me? I'm not a mechanic and can't remove it to look for numbers, but took really good photos. Thanks
How hard would it be to setup and tune a quadrajet for a 5.3 ls build? I have a 1984 Trans Am and am thinking about using the original quad on the stock 305.
Hi, I have a Boss Hoss in the U.K. I have a edlebrock q-jet. The number is 89045 and below 3105 W. What do these numbers mean please. Also Are Rochester and Edelbrock the same apart from name ? Thanks
Can you help? I have a 1966 Caprice with a 327 275 hp motor. Unfortunately, the little red tag is gone with the date and carb number. One thing that seems strange about my carb is the mechanism that runs across the top of the secondary butterfly on the drivers side. The early carb in your video with the red tag is very similar to mine, except the fuel line comes in from the side. If you look at that carb, you can see a hole right behind the choke horn on the left side. This is where the mechanism starts on mine, then goes across the left butterfly and attaches to the back of the carb diagonally. What does this do? My secondaries open up, but the butterfly does not. What's going on??? Have you seen this before?? Thanks!
That was the secondary dampener system in 1965-1966. You should be able to push open the air valves with your finger. If you can't, then the dampener is stuck in the bore. This type did not have a vacuum brake connected with rod to secondary system like they did starting in 1967.
sell me a q jet for a 62 283 , was a 2 brl has power pack heads and the tiny gas miser cam that came stock . dont want 2 barrel its for my c10 with 700r4 for a shop truck that wont drink gas . HELP I can and would rather rebuild if throttle body isnt sloppy I have never shimmed one
Yours is a 1978 automatic chevy quadrajet. Should be a 800cfm. www.rodauthority.com/tech-stories/fuel-cooling/choose-your-quadrajet-number-identification-guide/
So what if your Quadrajet had none of these markings? I have 2 Rochester Qjets here for my 66' Olds Toronado and neither one has the code stamps in the locations you show. One has the round section, but there is nothing stamped on it.
My 86 K2500 has the one with the small 2 pin plug on top that has something to do with fuel metering I guess. Is it possible to switch it to one that doesn't have that like what's on the 454 in my 85 C30 dually? Also I'm probably wrong, but on the pickups the electric choke didn't get power until the oil pressure came up and closed a pressure switch.
@@treywilliams3671 My understanding is it's some sort of actuator or something for adjusting the metering rods. I think it works off a temperature sensor on the thermostat housing.
This is actually the same one that came factory on mine.. the newer carbs on full-size Chevys that only had that plug and it was gray with no other plugs, is for the accelerator pump shot amount to drop once warm, they no like anger make that temp switch, but I'm m sure one could be made to work, although you can also keep it unplugged and it will operate as normal, Rochester called it "dual-capacity accel pump".. it literally just kept it from being as much fuel wasted once warm on accel but on a mild build it probably needs the larger volume pump shot so it would only come in handy where throttle response wasn't as much of a concern
I have a qudrajet with a plug connection on top of carb on left side! Wanna know what is that plug connection for! Is it a tps censor or something else? It's also a electric choke qudrajet but I don't know what that plug is for! I'm learning here so bare with me. Any info will be great. Has two prongs inside of censor on carb if that helps any! Thanks
So mine is a 17085226. Would that mean a 1985 QJ, model 226? As know mine needs cleaned and resealed for sure. Runs okay, and motor is from an 85 or 86 truck as truck itself is 84 with not original motor.
226..The first 2 means it is 4 barrel carb..If this 2 was a 5, it would be California only.....second 2 means it is a Chevrolet application..6 means it is a Automatic transmission..The 8 means 1980 decade and the 5 means 1985
Hi, you can find our shipping information here: quadrajetpower.com/contact-us/ Our website also shows a description of our services and cost here: quadrajetpower.com/quadrajet-rebuild-service/
The choke housing would have to be replaced with hot air housing. Main carb body modified for vacuum source to the choke housing. Engine would have to have all of the hot air heat source tubes for supply. So yes, might be possible, but much easier and better to use electric.
Yes, Carter made many service replacement quadrajets with the 4 numbers and S. Fuel overflowing indicates problems with float height, needle/seat sealing, or fuel pressure too high.
Factory set them and capped them for original application. Caps were typically removed when it was rebuilt any time in the past. They need to be made available for tuning.
1983 march april 1983 g30 cutway rv 5.7 350 was mouse house haveing fun fix it got it run pop off etc no pedal idle yep geting them kits parts plan just get e-pump added newer block fuel pump still waiting get primp 43gallons half full that old gas had air cover so mustly just norm wear able parts
pre sure power vavle acc pump few the vcum items and hoses had cruse set up all them bells now rather just pull it cap off lot stock for now less vacum just go old 2barrel basic
I think I read somewhere that at their peak there was over 300 different models. And as a 28 year marine mechanic, I have rebuilt at least 100 of the marine versions.
Glad I found this video, I have a '78 Chevy c10 /350 sb and a quadrajet 4bbl carb, likely in need of a rebuild. I'll pull the stamped code and hopefully you can point me in the right direction for a rebuild kit.
yes, we can help!
My 76 nova has the 3rd carb you described , is running like a charm but maybe on the future I will have to clean or restore ... been watching some of your videos and learning some stuff everu time thanks for sharing my man
Prob the easiest carb to rebuild. I used to hate them but god dame they work good when you know which one to use. That and they are great for fuel mileage bc the primary is smaller. Long as your not doing pulls lol cheers 🍻
Very helpful. Will get with you all soon for a rebuild kit.
Great video, thank you very very helpful.
Thanks for the info. I recently acquired a 1968 Firebird with a QJ and I want to learn more about it. Cheers!
Really appreciate the video. I recently inherited my grandfather's 74 GMC Jimmy. He put a 454 in her and I'm trying to figure out what parts are what year. Turns out the carburetor is an 80. Thank you again sir.
I love the Quadrajet! I would always use the 4 barrels on my engine with a turbo 350 transmission. You "KNOW" that its right when the four barrels open up and the transmission downshifts at the "SAME TIME".....
Same time = perfection
Is there a way to identify a qjet carb if it doesn’t have the aluminum tag in the circle stamp? I don’t see any other number on carb it self. And I need to rebuild it.
How about a video on the electronic quadrajets.
Thank you for sharing
Website for Q-jet sales Thanks great informative video.
I have a '66 De Ville Conv. with a 429. My carb seems to have a vacuum leak, (stalling out at idle or stops, at moving speeds no problems). It does not seem to look like any of the examples, best I can tell. How do I figure it out so I buy the right part for a mechanic to rebuild it for me? I'm not a mechanic and can't remove it to look for numbers, but took really good photos. Thanks
Do you build and sale carbs that will work for purestock race car?
Thank you!
How hard would it be to setup and tune a quadrajet for a 5.3 ls build? I have a 1984 Trans Am and am thinking about using the original quad on the stock 305.
The quadrajet can be built and tuned for any engine. It just requires the proper set up and calibrations.
Just found out which one i have. Thanks.
Hi, I have a Boss Hoss in the U.K. I have a edlebrock q-jet. The number is 89045 and below 3105 W. What do these numbers mean please. Also Are Rochester and Edelbrock the same apart from name ?
Thanks
Can you help? I have a 1966 Caprice with a 327 275 hp motor. Unfortunately, the little red tag is gone with the date and carb number. One thing that seems strange about my carb is the mechanism that runs across the top of the secondary butterfly on the drivers side. The early carb in your video with the red tag is very similar to mine, except the fuel line comes in from the side. If you look at that carb, you can see a hole right behind the choke horn on the left side. This is where the mechanism starts on mine, then goes across the left butterfly and attaches to the back of the carb diagonally. What does this do? My secondaries open up, but the butterfly does not. What's going on??? Have you seen this before?? Thanks!
That was the secondary dampener system in 1965-1966. You should be able to push open the air valves with your finger. If you can't, then the dampener is stuck in the bore. This type did not have a vacuum brake connected with rod to secondary system like they did starting in 1967.
What amperage/12v fuse for ignition on automatic choke ?
Actually mine reads
17056502 and is identical to the 3rd one have never messed with it in the last 20 years and it runs good I can tell you that
I have a 71 gto with a 1973 Pontiac Catalina 455 what would you suggest
I have 2... One on a gmc 78 454. And a 17083226 rochester quadrajet. Think it's 83 chevy electric choke.
sell me a q jet for a 62 283 , was a 2 brl has power pack heads and the tiny gas miser cam that came stock . dont want 2 barrel its for my c10 with 700r4 for a shop truck that wont drink gas . HELP I can and would rather rebuild if throttle body isnt sloppy I have never shimmed one
I have a 17058204, i believe it has the adjustable air bleed. Is it viable to place on a 454 in my 78 C 20 ?
Yours is a 1978 automatic chevy quadrajet. Should be a 800cfm. www.rodauthority.com/tech-stories/fuel-cooling/choose-your-quadrajet-number-identification-guide/
So what if your Quadrajet had none of these markings? I have 2 Rochester Qjets here for my 66' Olds Toronado and neither one has the code stamps in the locations you show. One has the round section, but there is nothing stamped on it.
If it has the round spot for tag, then that tag must have come out. That makes it difficult to identify but we can with pictures.
@@QuadrajetPowerLLC thanks for the reply! Well I have lots of pictures. Where would I send them? Thanks!
@@ourkid2000 send to info@quadrajetpower.com
Do you rebuild them
My 86 K2500 has the one with the small 2 pin plug on top that has something to do with fuel metering I guess. Is it possible to switch it to one that doesn't have that like what's on the 454 in my 85 C30 dually? Also I'm probably wrong, but on the pickups the electric choke didn't get power until the oil pressure came up and closed a pressure switch.
Mine has that 2 and I thought maybe it was a tps censor but I'm seeing it's a fuel metering censor. What is it for and what does it do?
@@treywilliams3671 My understanding is it's some sort of actuator or something for adjusting the metering rods. I think it works off a temperature sensor on the thermostat housing.
This is actually the same one that came factory on mine.. the newer carbs on full-size Chevys that only had that plug and it was gray with no other plugs, is for the accelerator pump shot amount to drop once warm, they no like anger make that temp switch, but I'm m sure one could be made to work, although you can also keep it unplugged and it will operate as normal, Rochester called it "dual-capacity accel pump".. it literally just kept it from being as much fuel wasted once warm on accel but on a mild build it probably needs the larger volume pump shot so it would only come in handy where throttle response wasn't as much of a concern
Super helpful thanks
Glad it helped
I have a qudrajet with a plug connection on top of carb on left side! Wanna know what is that plug connection for! Is it a tps censor or something else? It's also a electric choke qudrajet but I don't know what that plug is for! I'm learning here so bare with me. Any info will be great. Has two prongs inside of censor on carb if that helps any! Thanks
That is the mixture control solenoid for the engine computer system.
The electric choke elament needs to be powered thru oil pressure switch.
How does the choke turn off with the electric version?
Once it is warm, it continues to draw a small amperage to stay warm and open. It doesn’t turn off until key is turned off.
So mine is a 17085226. Would that mean a 1985 QJ, model 226? As know mine needs cleaned and resealed for sure. Runs okay, and motor is from an 85 or 86 truck as truck itself is 84 with not original motor.
226..The first 2 means it is 4 barrel carb..If this 2 was a 5, it would be California only.....second 2 means it is a Chevrolet application..6 means it is a Automatic transmission..The 8 means 1980 decade and the 5 means 1985
I have a 78 gmc pickup. The carburetor reads 7045583yz0837. Does this mean mine is a 1975 carburetor? Is it at least correct for being a gmc?
It is a 1975 GM/Chevy truck quadrajet
How do I send my car rated to you to do the rebuild and cost of a rebuild?
Hi, you can find our shipping information here: quadrajetpower.com/contact-us/
Our website also shows a description of our services and cost here: quadrajetpower.com/quadrajet-rebuild-service/
Can the electric chock carburetor be modified to an hot air chock?
Please let me know.
Thank you.
The choke housing would have to be replaced with hot air housing. Main carb body modified for vacuum source to the choke housing. Engine would have to have all of the hot air heat source tubes for supply. So yes, might be possible, but much easier and better to use electric.
Can the quaderjets be calibrate ed for a cam olds 455
Yes, it can
Do you guys have a 7028250 laying around that you would sell? Thanks.
Yes, we do have some 7028250's available. quadrajetpower.com/oldsmobile-1968-350-7028250/
Mine says 4850S Quadrajet, Carter .
Its currently on a 1969 chevy k-10 with a 350 , 4 speed.
Its overflowing gas out the top ? (Primaries)
Yes, Carter made many service replacement quadrajets with the 4 numbers and S. Fuel overflowing indicates problems with float height, needle/seat sealing, or fuel pressure too high.
Hi , I have a 65 olds cutlass would you happen to know what kind of carb it has ? I know it’s 4 barrel
It is probably the Rochester 4 jet. In 1966, Olds began using the Quadrajet.
Would you guys happen to have it for sale or can I have mine rebuilt
Hi so I have a Rochester 4 jet 7024154
google Olds FAQ -- Oldsmobile Junction if you have questions they have all the answers
Why are the air gas adjusters screws capped,
Factory set them and capped them for original application. Caps were typically removed when it was rebuilt any time in the past. They need to be made available for tuning.
@@QuadrajetPowerLLC Thank you!!
CAN AN ELECTRIC CHOKE HOUSING BE ADDED ON TO A MARINE DIVORCED CHOKE STYLE THAT HAS THE SPRING MOUNTED ON THE INTAKE
No, that carb is not designed for the carb mounted choke components.
1983 march april 1983 g30 cutway rv 5.7 350 was mouse house haveing fun fix it got it run pop off etc no pedal idle yep geting them kits parts plan just get e-pump added newer block fuel pump still waiting get primp 43gallons half full that old gas had air cover so mustly just norm wear able parts
pre sure power vavle acc pump few the vcum items and hoses had cruse set up all them bells now rather just pull it cap off lot stock for now less vacum just go old 2barrel basic