GM put a massive amount of research , testing, and development into this carburetor!!! It’s biggest enemy was people tinkering with it. The fuel injection system they had back in the 50’s and 60’s fell to the same ignorance.
When a quadrajet is perfect, its unbeatable. Much more precise fuel metering than Holleys. They are more complicated but are phenomenal carbs if you understand them.
The designer of the Quadrajet lives right here in Rochester, NY. A mechanic aquantance of mine visited his house and was shown how to set up the Quad. Very simple. He is over 90 years old...
That was really beautiful. Normally we see and hear quadrajets on smogged out small blocks making the noise and delivering no performance. This was different...A beast really. Makes ne want to try one.
Looks like a clean low 11 pass! Great job tuning that Q-jet. A lot of not-so-brights would pitch them to the scrap yard and we would snatch them up, tune them and bet the pants off the non-believing crowd.
Love that…. People use to underestimate the quadrajet , I had put a cam and aluminum intake on my 1980 Z28, tweaked my Rochester by re-jetting and few other things, backed by headers and real dual exhaust……it performed better than and Holley and it was reliable💯👍
Used to really enjoy tuning these this carb, installed a ho enterprises tune kit for our 76 trans am. Updated Jets metering rods longer rocker arms for the exhaust and a recurve spring set gained 2 seconds in the quarter mile with just a little work, and $180 kit .
Yep. I'll NEVER forget that sound! I should have NEVER sold that car! My Quadrajet was tuned by Braswell, in Tucson, AZ, motor balanced and blueprinted by Motion Performance of Long Island. Ran Crane Cam and valve springs, Doug Headers, 4:33 gears, Lakewood Traction Bars, Carter Electric Fuel Pump at the Trunk, Cureride 90/10 Uplock Shocks in the front, Carrera 40/50 Downlock Shocks at the rear, and Casler Racing Slicks. My '68 Firebird 400 RAM Air II ran low 11's. Six miles to a gallon of Sunoco 260 100 Octane.
I’ve got a Rochester Q-jet on a Mercruiser 5.7 in my boat. When those secondaries open up you better be holding on to something. But when you’re just cruising around it gets just as good of fuel efficiency as an injected motor. Never letting go of that carb !
The great thing about the Quadrajet is it's two carburators in one: a fuel economy, emissions and driveability carburetor on the tiny primaries...and an on demand performance carburetor when those massive secondaries open!!!
oh man. im going to have a permanent wood for the rest of the week. i miss that roar like crazy. had a q jet on my old camaro and i completely removed the secondary vacuum governor. when that kicked in you could hear it 10 kms away and the kick would make you shit your pants. this brought back some of the best memories.
THAT was better than sex lol... In the 35 years I have been playing with cars, I ALWAYS end up running a Qjet. Doug Roe's Quadrajet book is priceless and I also learned a lot from David Vizard.
Well, the 429 SCJ isn't Ford's biggest motor, since they also had the 460 and 462 V8s. Also the reason why they bought Quadrajets from GM is that 1. Ford didn't have their own spreadbore carb until 1973 and 2. The Quadrajet was the only way to get 750-800 CFM without making the motor too radical and "unstreetable".
I believe it was the '71-'72 429s that had the Qjet factory, mostly Thunder Jets, maybe Cobra Jets and Police Interceptors, I believe the Super Cobra Jets were Holley.
Someone spent some time setting up this Rochester in the video, engines with a properly tuned Q-Jet have their own sound, well done! When I raced stock cars back in the 70's I actually had guys at one track protest my Quadrajet so to shut them up I put on a Holley spread bore and still went like hell but without that big punch the Rochester had. The difference between the Rochester vs the Holley power delivery wise made me have to make some pretty big changes to the chassis setup, some people can be so one dimensional. After I changed the carburetor they protested my shocks, there was no "shock rule" other than they had to be NOT coil over type, those protests were over my having 2 or 3 shocks per wheel but they were standard Monroe or Gabriel pickup truck shocks, at the time they cost about $15 each, tie rod mount type racing shocks were $60 or 80 each at the time, what the heck huh??
0:30 damn, did the thing pop a wheelie? . you can see the supper control arm..... if it didnt pop a wheelie.... it damn sure has some torque!!! i love the BONE STOCK 400 SBC in my 77 K10 pickup.... lots of power everywhere!!!
Quadrajunk? I wonder why Ford chose it to be the FACTORY installed carb for the 429 Cobra jet performance engine? Guess their engineers didn't think it was junk! LoL
I had an 84 El Camino I bought brand new. I sold it 2 years ago. I put 308,000 miles on it. I never touched the carb. It had the electronic trim feature. If that doesn’t shout out quality, I don’t know what does.
I had a 84 Z28 with an electronic Qjet on it. That thing ran perfect. When the secondaries would open up, all hell would break loose. I have a 86 IROC with a feedback Qjet on it. The 305 coming out for a 350 with the feedback Qjet going back on.
Today q-jets are easy to pass on in favor of a Holley or Holley-clone. Because tuning parts and pieces are hard to find, or have to be custom made for the q-jet.
All you can hear is exhaust in this video. The quadrajet vacuum secondaries sound like a huge suction sound that is shockingly quick to open up and hear.
I knew an old mad that told me he used to tune his drag car by sitting on the cowl and setting the secondaries and timing while his son took it for a pass! Different times?
The small fuel bowls, and the fact that each q-jet was specifically tuned for the specific engine/vehicle combination (which meant they often didn’t work as desired when swapped from 1 engine to another) many many people suffered bogs, stumbles, and with marginal fuel pump and a small float bowl, many performance cars couldn’t get away from fuel starvation issues. And the Quadra bog nickname stuck.
Oh ,I had a lot of those quadrajets first time I seen one like the video still it's a lot better than edelbrock and some other ones so the ones they hate it's because they ain't nothing no competition
I've only seen them clogged up with dirt and crud and the choke pull offs dry rott over time due to under hood engine temperature and vacuum lines in all honesty that about all that goes wrong with the Q JET or it was rebuild by someone who didn't understand and had hate for them in the first place and don't know there carb adjustments
Ill take a Q jet over anything ! They four wheel the best and i ben spankin fords for 38 years now with em ! My ford buddys hate me ! I get 2 ta 4 more miles to the gallon plus than ther boat anchor holleys ! And my stock 400 sbc with a q jet n headers has just embarrased ppl since the late 70s ! My 307 with a 327 intake and headers ate all kinds of 390s and ford 400s . Set em up right and Hang On !
@@rayota260 thats just what the last guy said ! Right before i ate his lunch ! 390 .030 over meling cam . Boat anchor holley . He had me by a car length till i popped that spreadbore . Went on by and put 2 car lenghths on him ! If i remember right , his exact words were FUCK ! I cant Fuckin believe that ! Fuck ! Ya got out in front and i just couldnt reel ya back in ! Shit ! What ever brother !
@@rayota260 that was a 73 LT some put a 307 in . Kids dad pulled the 350 . Put a 307 in it . 3:08 posi rear end . Car would broil the tires when ya dumped the spreadbore
@@rayota260 heres another story for ya . My buddys 400 ford died . I had a 400 out of a ltd . Gave it to him . He had it rebuilt . Fresh heads . RV cam . Headers . Boat anchor holley . He had about 30,000 miles on it . We line up . Im in 79 k5 blazer . Stock 350 with 200,000 miles on it . Q jet n headers . Roy agreed i won by at least 12 truck lengths ! He had me by about a half a truck , till i dumped my spredbore . 12 truck lengths !
GM put a massive amount of research , testing, and development into this carburetor!!! It’s biggest enemy was people tinkering with it. The fuel injection system they had back in the 50’s and 60’s fell to the same ignorance.
When a quadrajet is perfect, its unbeatable. Much more precise fuel metering than Holleys. They are more complicated but are phenomenal carbs if you understand them.
Lol yeah ok
@@ericjohnson8482 True story🤷🏻♂️
Had a four door Acadian with a 350 powerglide combo that did 0-60 in four seconds with a quadrajet, absolutely wild power when they work properly
The Q JET is the best there is and they hated jeasus too because he spoke the truth 👏
@@jasonhumphry5836. Amen Brother! 👍
The designer of the Quadrajet lives right here in Rochester, NY. A mechanic aquantance of mine
visited his house and was shown how to set up the Quad. Very simple. He is over 90 years old...
Is he still alive? I must meet this man.
@@robertlucas1435 I don't know. A mechanic in Rochester told about this two years ago but I don't know if the guy is still alive.
@@LMike2004 Aw, man....what a legend.
When the secondary air valve opens up it a thing of beauty!
That was really beautiful. Normally we see and hear quadrajets on smogged out small blocks making the noise and delivering no performance. This was different...A beast really. Makes ne want to try one.
GAWD I love that sound!!! Nothing like a well tuned Q-Jet!!!
That's one quick releasing vacuum break on those secondary flaps! Nice.
Looks like a clean low 11 pass! Great job tuning that Q-jet. A lot of not-so-brights would pitch them to the scrap yard and we would snatch them up, tune them and bet the pants off the non-believing crowd.
10.60 D/SA Firebird
Those two massive secondaries act like a two-stroke engine, when you put your foot in it. Spread-bore over square-bore any day.
Absolutely. The Rochester 2se 2 barrel on my 2.8 beater works great. Great drivability but power when I need it.
How does it act like a 2 stroke?
@@hendo337 Two-strokes have a power-band where the bike seems to jump to life after a certain RPM. That's what I'm trying to convey.
dammit that quad is tuned perfectly with that pontiac and love the sound of that cam great video thank you...
Love that…. People use to underestimate the quadrajet , I had put a cam and aluminum intake on my 1980 Z28, tweaked my Rochester by re-jetting and few other things, backed by headers and real dual exhaust……it performed better than and Holley and it was reliable💯👍
Did the same with my '79
I watch this video religiously about once a month.
Nothing moans like a QuadraJet when you open those two back barrels up!
This video is so badass by the sound alone. I miss those days when muscle cars sounded like this.
Used to really enjoy tuning these this carb, installed a ho enterprises tune kit for our 76 trans am. Updated Jets metering rods longer rocker arms for the exhaust and a recurve spring set gained 2 seconds in the quarter mile with just a little work, and $180 kit .
Yep. I'll NEVER forget that sound! I should have NEVER sold that car! My Quadrajet was tuned by Braswell, in Tucson, AZ, motor balanced and blueprinted by Motion Performance of Long Island. Ran Crane Cam and valve springs, Doug Headers, 4:33 gears, Lakewood Traction Bars, Carter Electric Fuel Pump at the Trunk, Cureride 90/10 Uplock Shocks in the front, Carrera 40/50 Downlock Shocks at the rear, and Casler Racing Slicks. My '68 Firebird 400 RAM Air II ran low 11's. Six miles to a gallon of Sunoco 260 100 Octane.
That sounds amazing and is fast as hell.
The rochester quadrajet carburetor doing the job as it should and the only carburetor that sings out through the night like a lions rore
Them ram air 400s were no joke!! and that 4 barrel is running top! Sounds awsome.
I’ve got a Rochester Q-jet on a Mercruiser 5.7 in my boat. When those secondaries open up you better be holding on to something. But when you’re just cruising around it gets just as good of fuel efficiency as an injected motor. Never letting go of that carb !
The great thing about the Quadrajet is it's two carburators in one: a fuel economy, emissions and driveability carburetor on the tiny primaries...and an on demand performance carburetor when those massive secondaries open!!!
Love that sound of old school power of a four barrel opening up
Best street carb ever
When those big ass back doors open up its all business boy, damn!
It's what separates the men from the boys
A lot of people didn't realize that the 4 barrel air valves were adjustable.
oh man. im going to have a permanent wood for the rest of the week. i miss that roar like crazy. had a q jet on my old camaro and i completely removed the secondary vacuum governor. when that kicked in you could hear it 10 kms away and the kick would make you shit your pants. this brought back some of the best memories.
Now that's a well tuned Q jet!
This is phenomenal. I love the quadrajet. I thought I was the only one
I love that sound!!! There nothing that sound like that you can hear it s mile away !
THAT was better than sex lol...
In the 35 years I have been playing with cars, I ALWAYS end up running a Qjet. Doug Roe's Quadrajet book is priceless and I also learned a lot from David Vizard.
I owned a 68 firebird ram air 2 car factory 390 gears very rare and quick
Love them secondaries sound
Impressive! That's one stout Pontiac!
Sounds amazing! Love it!
Love that sound!!
I want that as a ringtone
Ford bought QJets from GM in 1970 for their 429CJ. Thats right, QJets as OEM on Fords biggest motor. Ha!
Well, the 429 SCJ isn't Ford's biggest motor, since they also had the 460 and 462 V8s. Also the reason why they bought Quadrajets from GM is that 1. Ford didn't have their own spreadbore carb until 1973 and 2. The Quadrajet was the only way to get 750-800 CFM without making the motor too radical and "unstreetable".
I believe it was the '71-'72 429s that had the Qjet factory, mostly Thunder Jets, maybe Cobra Jets and Police Interceptors, I believe the Super Cobra Jets were Holley.
I LOVE THAT SOUND!!!!
beautiful sound
Sounds like a beast 👍
Most QJs do not sound this awesome.
Holley make these qjets now with fuel injection and that icon sound comes with it can't wait to get one for my cutlass 😂
And lots of Rpm's... Sounded very awesome....
sounds great Id love to see how the carb is setup
I had one on my Mach 1 for a little bit. Worked pretty good
Wow that was exciting !
Someone spent some time setting up this Rochester in the video, engines with a properly tuned Q-Jet have their own sound, well done!
When I raced stock cars back in the 70's I actually had guys at one track protest my Quadrajet so to shut them up I put on a Holley spread bore and still went like hell but without that big punch the Rochester had.
The difference between the Rochester vs the Holley power delivery wise made me have to make some pretty big changes to the chassis setup, some people can be so one dimensional. After I changed the carburetor they protested my shocks, there was no "shock rule" other than they had to be NOT coil over type, those protests were over my having 2 or 3 shocks per wheel but they were standard Monroe or Gabriel pickup truck shocks, at the time they cost about $15 each, tie rod mount type racing shocks were $60 or 80 each at the time, what the heck huh??
Music to my ears!
I love the Quadrajet had one on my 455 GTO
The Quadrajet is an excellent carburetor.
0:30 damn, did the thing pop a wheelie?
.
you can see the supper control arm..... if it didnt pop a wheelie.... it damn sure has some torque!!!
i love the BONE STOCK 400 SBC in my 77 K10 pickup.... lots of power everywhere!!!
D*** that sounded like a screaming eagle... WOO!!!!! If it keeps running like That just keep that Qjet on there and roll
Now That's what a Quadrajet can do ! 👍👍👍
That was satisfying
Me with a Carter thermoquad.
I understand my dude. I understand.
My friend thats a Ford guy always calls it Quadrajunk but i think the quadrajet on my 327 in my 67 impala is awsome!
Quadrajunk? I wonder why Ford chose it to be the FACTORY installed carb for the 429 Cobra jet performance engine? Guess their engineers didn't think it was junk! LoL
@@Sculpin74 never knew that, that's pretty cool!
Dodge used it to on the 440 tnt 375 hp motor
@@WesleyJackson-wp5ydthat was the Thermoquad which was a similar design to the Qjet.
I had an 84 El Camino I bought brand new. I sold it 2 years ago. I put 308,000 miles on it. I never touched the carb. It had the electronic trim feature. If that doesn’t shout out quality, I don’t know what does.
I had a 84 Z28 with an electronic Qjet on it. That thing ran perfect. When the secondaries would open up, all hell would break loose. I have a 86 IROC with a feedback Qjet on it. The 305 coming out for a 350 with the feedback Qjet going back on.
My favorite carbs and I am a Ford guy.
There were 429s that came with factory Qjets. Some of the best sounding engines with it because of the big bore shorter stroke design.
@@hendo337
My favorite kind of engines!
Dam that thing sounds good 👍🇺🇸🇺🇸
nothing like a quad roar!!
Waaaaaaaaaaaaaaaaah!!! Loved it
SOUNDED LIKE 7200 OR SO TO ME.. HUGE CAM TOO..MEGA THUMPER
That was a good one
Today q-jets are easy to pass on in favor of a Holley or Holley-clone. Because tuning parts and pieces are hard to find, or have to be custom made for the q-jet.
All you can hear is exhaust in this video. The quadrajet vacuum secondaries sound like a huge suction sound that is shockingly quick to open up and hear.
That’s awesome
I have only worked on the carbs on my 1996 gsxr 750
I knew an old mad that told me he used to tune his drag car by sitting on the cowl and setting the secondaries and timing while his son took it for a pass! Different times?
Neat to see a GTO unit do its thing, not like an untweaked Firebird Q-jet
HELL YEAH!!!
Sweet!
The small fuel bowls, and the fact that each q-jet was specifically tuned for the specific engine/vehicle combination (which meant they often didn’t work as desired when swapped from 1 engine to another) many many people suffered bogs, stumbles, and with marginal fuel pump and a small float bowl, many performance cars couldn’t get away from fuel starvation issues. And the Quadra bog nickname stuck.
But when set up right man it like poetry in motion when them back barrels open up
golly my goodness
excuse me please
i need to pick my jaw up off the floor
that noooiiiiise
all business right there!
Great video of a properly adjusted secondary air valve. "Nice"
Is there a video of the car?
look at my other vids, there should be on from the outside
HELL YA
Have mercy!
That was fucking wicked
now that's ear sex.
I love q jets
Nice I noticed that you cut the secondary air vents gives u a great acceleration in drag
Factory Pontiac, that's the way this carb came
Oh ,I had a lot of those quadrajets first time I seen one like the video still it's a lot better than edelbrock and some other ones so the ones they hate it's because they ain't nothing no competition
Hangers and rods were a pain in the ass, but when it was dialed, look out. Never understood why most carbs were square bore and not spread bore.
Wow.
Thermo quad good too..
Let me borrow your carburetor for a wedding...
Definitely pulling all the air it can deliver lol if that's only a 750. I have an 800 I'll trade ya came off a 78 trans am
Rebuilt many of them!
Looks like it's got a dual plane intake manifold.
kool
Nice ,but no fuel from pullover jets at front of secondary air doors ?
Can you share the setup in terms of metering rods, jets, vacuum/manual advance etc ?
fk yeah, awesome,
Those upper A arms 🤣
That……. Was just plain Badass! No wussy electric crap there!
Gator mclusky would approve
Can we please get rid of all this electronic bs and go back to this 😍
no quad bog here!
I've only seen them clogged up with dirt and crud and the choke pull offs dry rott over time due to under hood engine temperature and vacuum lines in all honesty that about all that goes wrong with the Q JET or it was rebuild by someone who didn't understand and had hate for them in the first place and don't know there carb adjustments
I used to flip my air cleaner and man did it suck air and it was loud I terrorize the neighborhood
LOL awesome....
Is this car in neutral or street driven?????
Ill take a Q jet over anything ! They four wheel the best and i ben spankin fords for 38 years now with em ! My ford buddys hate me ! I get 2 ta 4 more miles to the gallon plus than ther boat anchor holleys ! And my stock 400 sbc with a q jet n headers has just embarrased ppl since the late 70s ! My 307 with a 327 intake and headers ate all kinds of 390s and ford 400s . Set em up right and Hang On !
Your 307 with "a 327 intake and headers" didn't eat any ford 390 or 400 unless they were deep into the smog shitpen.
@@rayota260 thats just what the last guy said ! Right before i ate his lunch ! 390 .030 over meling cam . Boat anchor holley . He had me by a car length till i popped that spreadbore . Went on by and put 2 car lenghths on him ! If i remember right , his exact words were FUCK ! I cant Fuckin believe that ! Fuck ! Ya got out in front and i just couldnt reel ya back in ! Shit ! What ever brother !
@@rayota260 that was a 73 LT some put a 307 in . Kids dad pulled the 350 . Put a 307 in it . 3:08 posi rear end . Car would broil the tires when ya dumped the spreadbore
@@rayota260 heres another story for ya . My buddys 400 ford died . I had a 400 out of a ltd . Gave it to him . He had it rebuilt . Fresh heads . RV cam . Headers . Boat anchor holley . He had about 30,000 miles on it . We line up . Im in 79 k5 blazer . Stock 350 with 200,000 miles on it . Q jet n headers . Roy agreed i won by at least 12 truck lengths ! He had me by about a half a truck , till i dumped my spredbore . 12 truck lengths !
@@theweldor757 whos your dealer? i want some of what hes selling.