Thanks for the intell you saved me on a promise i made and almost couldnt back up. ive built these before but it was like 27 years ago and i was stuck trying to set the floats . I appreciate it keep up the good work
Great instructional video... I really wish my father was alive to see how easy really is to do something we tried to do together but never really worked right.. again thank you..
Thank you so much. I ordered a rebuild kit and throttle shaft installation kit from you guys. These videos are very helpful. Especially the springs at the end of the shaft. Thank you again.
@@QuadrajetPowerLLC Hello do you still sell parts for quadrajet carburetors. The brass tubes in the air horn? All 4 pieces? Also the needle and seat, the seat that has the half moon or windowed hole & the bottom? That's it for starters I'll send a carburetor # tomorrow. Thanks, George
@@georgesabol459 Yes we sell parts. www.quadrajetpower.com email us at info@quadrajetpower.com quadrajetpower.com/vent-tubes-pair-air-horn-new/ quadrajetpower.com/secondary-pick-up-tubes-pair-new/ quadrajetpower.com/needle-and-seat-130-orifice-with-window/
I appreciate the very complete kit and this video. What if you see one tiny pin hole of light at back of carb when you check base gasket with flashlight? Edit, the optional secondary well sponge was keeping it from sealing, a little more english was required.
I have a 7045583 and after installing the base throttle plate I can see some light after tightening with a new gasket. Any tips on what I should do to correct it? I can see light on the choke side near the secondary shaft. Iused a straight edge on the main body near that area and measured it with a feeler gauge and it is out about .012
You should do a rebuild of an electronically controlled Dual-Jet along with a crash course on how the various components/sensors work….yea I know, everyone says “they’re the same exact thing as the quadrajet just without the secondaries”…..except THEY’RE NOT!!!
I have a question, I had always played with these for many years and learned alot... But Ive been watching your videos to learn more, and humbled myself many times to make sure my next build was about as good as it could be, lol.. question is.. I have a 1/2 pickup (85 K10) came with a M4MED with the "dual-capacity pump"... There is now a fresh engine (350; well, 355 actually).. and it's running on a '78 quad from?? Idk.. but it doesn't run as well as it should.. I know it can be fixed.. but I have another carb identical to the one that came with it.. and I know they only made those a few years, but I do know it came from either a 305 or a 350, my motor has had only 5 upgrades when built TRW 0.030 over flat-tops, high volume oil pump, a classic 224 cam with a 112Lsa turned by a double-roller.. that's it.. and I was told by my dad (had the engine 38yrs that the guy that built it said it produced about 252hp on a Holley spreadbore with 74jets.. so I know two other people with vehicles and similar compression & cam.. and the truck carbs like those seem to already be almost perfect until you go with a tighter love separation (loses vacuum).. I noticed even the one I have runs a bit rich and gets better mpg at 2900-3000rpm than right around 2000 where you think it would🤔.. and I know that with 10-15% ethanol, what used to be a hair rich might almost be perfect.. and the truck carbs seem not to make not a bit of cam🤷.. so should I build and use that carb? & If I do should I leave the jets alone and just focus on APT adjustment since they seem to work very well with setups like mine (atleast what I've seen twice already).. bc whatever mine came from, it doesn't jive with my build, the Holley would pull a truck that weighed well over 5000lbs and could spin it around if you cracked on it in 2nd and break loose in 3rd.. now it's on a th350 and barely barks in 1st😔 (and no, I'm not hard on it, it's just disappointing knowing how it ran before, and now it's maybe 170hp at best it feels).. and it could be 250+..what should I do if I decide to go back with my other M4ME? And be I even slap the top 🎩 n I do wanna turn on that APT about a 1/4-1/2 turn from experience bc it usually gets a bit snappier that way on ones I've worked on with mild builds.. what would you recommend? I know these questions probably make more, but if it's already that close to being correct other than the slightly lower vacuum at idle, and 5more cubes..
my car 1970 buick electra 455 7040240 4MV. Love the video. What Clip did you use for the choke rod at the 25:00 of the video. Mines has come loose and currently I put a cotter pin like clip. Thank you so much for your videos.......
love all the videos- question- your float height of 9/32- is that from the top of the back of the float to the top surface of the main body? and does that value hold true for high performance builds where we've modified the carb?
OK I have a basket full of quadrajet parts can you tell me where I can find info on what part goes to which carb. Especially secondary hangers and rods. I have book's but nothing on what I mentioned. Can you help.
Hangers were non carb specific. Hangers were assigned during assembly based on the measurements at the time. Secondary rods were assigned based on carb number. It is difficult to reverse look up carb application from manufacturing part numbers stamped, but we will help if we can.
The quadrajet is#17057213. Putting it on a 283 around 300hp need specs for secondary hangers and rods. Also what do I need to put a electric chock on it. Thank you
Define front of the float. Wouldn't that also be the front of the carb? Every Q-jet that I've taken apart (rebuilds & unmolested factory carbs) had the little clip located at the front of the carb opposite of where you showed it being installed.
Is there a plastic bushing that goes on the secondary idle shaft and into the primary choke rod hole that is on the passenger side of carb ? Maybe not !?
On the rebuild of my 79 Pontiac 400 Q-jet I didn’t take notice of the power piston’s stop adjusters turns out. I just disassembled everything to clean. How do I find out how to reset to the proper height?
You don’t need to drill air bleeds. What is your quadrajet code number and engine details. We can help you calibrate. Email us at info@quadrajetpower.com
HI, you can email us at info@quadrajetpower.com. We don't show any emails from you to us, but is you need an accelerator pump, here you go: quadrajetpower.com/accelerator-pump-assembly-new-with-return-spring/
I don't have a computer or internet, do y'all have a phone number to call you, I have a 67, Caddy and a quadrajet with a electrical mechanical switch or something 2 wires run down to transmission? I need parts and advice would be greatly appreciated. Good video I'm using it to work on mine. Thanks 👍👍👍
I have a 1988 GMC M.H.454W/RQ#17085000 04 07 JLY I GOT A KIT NO INSTRUCTIons.wañt a base plate w/ajustable A/F mix.screws &rebuild kit.with instructions.
You can remove the covers over the idle mixture screws so they can be adjusted. We have instructions and information on our website on the "Qjet Info" tab.
Thanks for the intell you saved me on a promise i made and almost couldnt back up. ive built these before but it was like 27 years ago and i was stuck trying to set the floats . I appreciate it keep up the good work
Great instructional video... I really wish my father was alive to see how easy really is to do something we tried to do together but never really worked right.. again thank you..
Good info. I have an 1972 Revcon with the olds tornado 455 that has been sitting for 18 years and I plan to get it back on the road this year.
Fantastic video! Thank You Quadrajet Power !
Have olds 455 carb stopped working. Took it off and found everything stuck together with dirt. Great vid helped me understand whats going on.
Glad this was helpful. Make sure you subscribe. We will continue to add to this channel.
I have learned alot from you brother. Thank you. I will ordering everything from you all.
Thank you so much. I ordered a rebuild kit and throttle shaft installation kit from you guys. These videos are very helpful. Especially the springs at the end of the shaft. Thank you again.
Glad to help
@@QuadrajetPowerLLC
Hello do you still sell parts for quadrajet carburetors.
The brass tubes in the air horn? All 4 pieces?
Also the needle and seat, the seat that has the half moon or windowed hole & the bottom?
That's it for starters I'll send a carburetor # tomorrow.
Thanks, George
@@georgesabol459 Yes we sell parts. www.quadrajetpower.com email us at info@quadrajetpower.com
quadrajetpower.com/vent-tubes-pair-air-horn-new/
quadrajetpower.com/secondary-pick-up-tubes-pair-new/
quadrajetpower.com/needle-and-seat-130-orifice-with-window/
I appreciate the very complete kit and this video. What if you see one tiny pin hole of light at back of carb when you check base gasket with flashlight? Edit, the optional secondary well sponge was keeping it from sealing, a little more english was required.
Great Video, Do you have a video showing the ATP adjustment on a late 70's Chevrolet quadrajet carb? Lots of good info here. Thanks.
Great video
I have a 7045583 and after installing the base throttle plate I can see some light after tightening with a new gasket. Any tips on what I should do to correct it? I can see light on the choke side near the secondary shaft. Iused a straight edge on the main body near that area and measured it with a feeler gauge and it is out about .012
You should do a rebuild of an electronically controlled Dual-Jet along with a crash course on how the various components/sensors work….yea I know, everyone says “they’re the same exact thing as the quadrajet just without the secondaries”…..except THEY’RE NOT!!!
I have a question, I had always played with these for many years and learned alot... But Ive been watching your videos to learn more, and humbled myself many times to make sure my next build was about as good as it could be, lol.. question is.. I have a 1/2 pickup (85 K10) came with a M4MED with the "dual-capacity pump"... There is now a fresh engine (350; well, 355 actually).. and it's running on a '78 quad from?? Idk.. but it doesn't run as well as it should.. I know it can be fixed.. but I have another carb identical to the one that came with it.. and I know they only made those a few years, but I do know it came from either a 305 or a 350, my motor has had only 5 upgrades when built TRW 0.030 over flat-tops, high volume oil pump, a classic 224 cam with a 112Lsa turned by a double-roller.. that's it.. and I was told by my dad (had the engine 38yrs that the guy that built it said it produced about 252hp on a Holley spreadbore with 74jets.. so I know two other people with vehicles and similar compression & cam.. and the truck carbs like those seem to already be almost perfect until you go with a tighter love separation (loses vacuum).. I noticed even the one I have runs a bit rich and gets better mpg at 2900-3000rpm than right around 2000 where you think it would🤔.. and I know that with 10-15% ethanol, what used to be a hair rich might almost be perfect.. and the truck carbs seem not to make not a bit of cam🤷.. so should I build and use that carb? & If I do should I leave the jets alone and just focus on APT adjustment since they seem to work very well with setups like mine (atleast what I've seen twice already).. bc whatever mine came from, it doesn't jive with my build, the Holley would pull a truck that weighed well over 5000lbs and could spin it around if you cracked on it in 2nd and break loose in 3rd.. now it's on a th350 and barely barks in 1st😔 (and no, I'm not hard on it, it's just disappointing knowing how it ran before, and now it's maybe 170hp at best it feels).. and it could be 250+..what should I do if I decide to go back with my other M4ME? And be I even slap the top 🎩 n I do wanna turn on that APT about a 1/4-1/2 turn from experience bc it usually gets a bit snappier that way on ones I've worked on with mild builds.. what would you recommend? I know these questions probably make more, but if it's already that close to being correct other than the slightly lower vacuum at idle, and 5more cubes..
learned a lot.
Excellent video.... What kit should I get for a Corvette 1978 L48 with A/C automatic, bone stock?
Hi, order this kit: quadrajetpower.com/qb1-quick-ez-kit/ for everything you need for a refresh. This kit includes float and filter.
my car 1970 buick electra 455 7040240 4MV. Love the video. What Clip did you use for the choke rod at the 25:00 of the video. Mines has come loose and currently I put a cotter pin like clip. Thank you so much for your videos.......
We use a hairpin clip with an angeled top.
quadrajetpower.com/rod-retainer-clip-5-clips-new/
love all the videos- question- your float height of 9/32- is that from the top of the back of the float to the top surface of the main body? and does that value hold true for high performance builds where we've modified the carb?
Yes. Center of main body to top of float. Can set to 1/4”.
@@QuadrajetPowerLLC great thank you!
OK I have a basket full of quadrajet parts can you tell me where I can find info on what part goes to which carb. Especially secondary hangers and rods. I have book's but nothing on what I mentioned. Can you help.
Hangers were non carb specific. Hangers were assigned during assembly based on the measurements at the time. Secondary rods were assigned based on carb number. It is difficult to reverse look up carb application from manufacturing part numbers stamped, but we will help if we can.
Thank you, I'll get you some carb ID. Happy 🎃
The quadrajet is#17057213. Putting it on a 283 around 300hp need specs for secondary hangers and rods. Also what do I need to put a electric chock on it. Thank you
Define front of the float. Wouldn't that also be the front of the carb? Every Q-jet that I've taken apart (rebuilds & unmolested factory carbs) had the little clip located at the front of the carb opposite of where you showed it being installed.
If you use the clip, it would go in center of the pivot end, hanging from the power piston side. Do not hook it through holes on the float pivot.
I built one last weekend and forgot to put the spring back in for the power pump 💩 oh well it’s not that hard to take apart
Is there a plastic bushing that goes on the secondary idle shaft and into the primary choke rod hole that is on the passenger side of carb ?
Maybe not !?
Yes, there is on some. If you have hot air choke you need it to seal or you will have a vacuum leak. Divorced chokes didn’t have a bushing.
que altura debe de tener, un saludo
Ultra Sonic cleaned or dipped? Thanks for your knowledge.
Joseph Aufieri we soak for 24 hours, then ultrasonic clean.
On the rebuild of my 79 Pontiac 400 Q-jet I didn’t take notice of the power piston’s stop adjusters turns out. I just disassembled everything to clean. How do I find out how to reset to the proper height?
Start at 3 turns up from seated and test from there and adjust if needed.
I've got about 650 horse can you give me an idea how big to drill the air bleeds
You don’t need to drill air bleeds. What is your quadrajet code number and engine details. We can help you calibrate. Email us at info@quadrajetpower.com
I'll get you guys the details thank you so much for calling back
hi .can a buick quadrajet. be rebuilt as a chevy sbc 60s model love your channel
How would the needle and seat work without the clip that connects the needle with the float.?
It would function fine. That clip is not needed with today’s fuels.
@@QuadrajetPowerLLCSorry I am still a little confused, but what then lifts the needle out of the seat to let fuel in if there is no clip?
@@TheHomy70 fuel pressure coming in. I have t run a clip in mine for many years.
Excellent question.....glad they responded as I was wondering the same!
Emailed so many times about an accelerator pump for my 7027203 and never heard back.
HI, you can email us at info@quadrajetpower.com. We don't show any emails from you to us, but is you need an accelerator pump, here you go: quadrajetpower.com/accelerator-pump-assembly-new-with-return-spring/
I don't have a computer or internet, do y'all have a phone number to call you, I have a 67, Caddy and a quadrajet with a electrical mechanical switch or something 2 wires run down to transmission? I need parts and advice would be greatly appreciated. Good video I'm using it to work on mine. Thanks 👍👍👍
I have a 1988 GMC M.H.454W/RQ#17085000 04 07 JLY I GOT A KIT NO INSTRUCTIons.wañt a base plate w/ajustable A/F mix.screws &rebuild kit.with instructions.
You can remove the covers over the idle mixture screws so they can be adjusted. We have instructions and information on our website on the "Qjet Info" tab.
Mine is different