re-jet your Quadrajet (part 1)

[@Brian-fl6rd]

Thanks for creating this great video. I just got a '68 Camaro SS396 with a new QJ that has a little hesitation when transitioning to on-throttle from off. With the help of your video I can now check/replace the jets to see if they are the right size for a 396 and perhaps the cause of the on-throttle stutter.

[@styga1969]

I'm in my work area as we speak dissembling my quad. Good video. And your right about Hollys. I have replaced alot of power valves on them. Thanx for the schooling.

[@briansd2772]

Ouch! You hit the always sensitive power valve nerve there and we're not even in the dentist office! I felt that and I don't even own a Holley!

[@EdontheBeach]

HA!

[@victorriceroni8455]

This is so much more fun to watch then someone screwing around with a lap top.

[@gearhead7961]

love the camino in the background, looks as clean as your carb. I have a 81 myself. I agree as well that the q-jet is the best street carb.

[@hydraulics]

thanks! - love the lithium grease tip! I'm very curious what jets are in my boat. It has a little 3.8L (229) chevy and the rebuilt Qjet I bought runs way too rich. With this video close by, I'm going in....

[@froglobster]

Thanks for the educational vid, you are a good teacher and very clear in your narration. I have a Qjet and I think I'll giver a stab thanks to this vid. GOOD DAY

[@dirtyburd71]

Let the Holley guys carry on! LOL! ;) My Q-Jet works just fine! Besides the fact that they work so good, I like getting the anti Q-Jet comments and continuing to have the trouble free, leak free, no power valve carburetor that works! :D

[@mcozpda3392]

Great , Great , Video ... always wanted to fix my carb ... and nobody explained it so well ... My problem is ... very rich .. and I set and reset it and it stays the same ... and I thought to change the jets , my truck is a c10 83 ... with a 305 engine ...... and sometimes I thought to change the carb for an after market like edelbrock or holley .. .. cheers ..

[@EdontheBeach]

if you are talking about the choke 'flap', it'll be open if it's warm. if it is 'stuck' open there is some impediment or your choke lever isn't properly connected

[@styga1969]

The kit I bought had the black plunger for the acc pump. Threw that out and got me a blue one. Also noticed epoxy on the base bowl for the welch plugs. Cleaned and put on some jb weld around them. And your right it is a piece of cake. Hardest part was the gasket install under the metering valve.

[@VinnyMartello]

Q-jets are under appreciated.

[@PleeseCallMeDan]

I learned alot in this 17 minutes, including that i messed up my Qjet rebuild 2 months ago... Great video though. Thanks!

[@cheguevara778]

Sir can you do a quick video on the other side of the quadrajet where the choke is. And I just want to see how does the back barrels activate or lift because I just brought 2 scrap quadras and they look different after some research one is from the late 70s and the other is from the 80s...Thanks

[@JackJohnson-mc7ki]

I have a 79. Are there any of these carbs that the needle is not attached to the float with the wire? When I took mine apart there was no wire attaching it to the float.

[@smokeydabeecharlescoleman8365]

Is that a 705 series ? If so I would love to ask you a few questions . I'm building one for my 78 454 in a C 20 truck. Mine is 17058204 2147 BHT . For instance at 17:36 we are looking down at a Phillips head screw just behind the metering well. Mine has an atp there . Did you modify it ?

[@EdontheBeach]

yes, watch part 2 all the way to the end. also if you have a stock '84 carb it's not like this one, the '84 will be electronically controlled while this one is not

[@EdontheBeach]

it'll be a piece o' cake - be sure and watch part 2, some good tips there for you as well. enjoy

[@1999person]

I've seen your video and thought it was great so many people slam the Rochester carb I have a 1987 monteCarlo ss I just put a 350 in it it's computer controlled gm copo burned the chip for it now I need to know what jets and metering rods to put in it the motor is pushing 300 hp with 356 torque I can get you more info on the motor if you need that appreciate your assistance if possible just trying to make it run as good as it looks from dean

[@DONDIVA1969]

Quadrajets get dogged out a lot by hotrodders but it is actually the best carb out there for street / strip performance cars. They are easy to tune and great on the street and there are stock class cars running 10’s with Quadrajet carburetion.

[@donewithutube]

Good video. I like the grease trick. That's slick for swapping main jets/rods. (pun intended) :)

[@cheguevara778]

Ok I know that the back bottom flaps are activated by the linkage on the drivers side. But how does the passenger side operate for the top flap covers?

[@NilsJakobson]

Hi! Great video on Qjet, I got 67 Firebird 400 project which came with dead Edelbrock 1406, had taken apart like 5 times and still does not idle. I guess the shafts are worn too much and I am considering the Qjet instead. The problem is the Ram Air thing, most of the Qjets for Pontiac have the Ram Air top, I dont have Ram Air, can I somehow remove or delete the Ram Air from top of the carb? And bit offtopic question - what rims are those on your El Camino? Thanks!

[@EdontheBeach]

??? I don't understand your question. 1) If your engine is GM, it came out of the factory with a q-jet which looks just like the one in my video. 2) there is no 'ram air' to remove or delete from the top of the carb. Ram Air was an option and all the parts for it are air cleaner and hood parts, not carb parts. 3) the Edelbrock 1406 is just an iteration of the old Carter AFB carb...IMO opinion you would be better off with a q-jet.

[@byrnesljr]

Would I have to adjust the metering rods if it is backfiring thought the carb?

[@EdontheBeach]

nothing on the passenger side affects opening the 2 large barrels. they are opened by the linkage shown in this vid on the driver side and the manifold vacum seen by the carb - yes, there are quite a few variants in q-jets from the 60s thru the 80s

[@rjtildemann306]

Last year I replaced the quadrajet on my boat with a remanufactured one. My engine now runs, but the gassy smell at and just off idle is overwhelming. The idle mixture screws don't seem to help any. We are at high altitude (around 5,000 feet). Is rejetting for altitude what the doctor ordered? If so, who sells the kits for high-altitude rejetting of this carb?

[@rayjos0424]

I would like to know the same thing. 76 truck with 400 is from sealevel and now I live at 5400ft and it runs so rich.

[@brentonstephenson333]

sir i have a holden 355 ci with mild cam , primary jets are 73 and secondary rods are CV.0530L.On the primary side the engine wants to boogy but on secondaries it bogs down. Now here in Australia there is a store selling DP.06886 rods and they say they are the only rods that will perform well. I cant see how this is possible as the rods i have in it have smaller tips than the DPs, possibly am i over fueling the secondary side. Also the secondary vacuum butterflies i have loosened the little grub screw let the tension off then using a screwdriver tensioned them back up to horizontal plus a quarter of a turn , is this correct . Would love your advice on these problems for two reasons as you seem to me to know your stuff and all my mates condemn me for using a quadrajet , as they all love their Holleys , well i dont as i think the quadrajet is truly youneek as is the only truly fully adjustable carby on the market.Please help.Andrew Australia

[@SlanginBeatz]

Hi Ed, when u talk about using white lithium grease on gasket. would it be ok to be safer & put grease on all the gaskets?

[@Caveman4860]

I have a Question... (a 35+yr. ASE Master Tech w/L-1, guy here). On the Metering Rod's adjustment screw.... I can't find a Spec. For it! Yep!, It's My Own Truck! (Sucks). I've re-built Hundreds! Hopped them up by shaving the Shaft's, die-grinding away area's for more Fuel Volume... While On the Bench apart(at home). Wife, helped Clean Garage! The Paper (with the Turn Count),.. was never Found! I've been chasing a lean Highway Cruse, ever since..... -Thom

[@Caveman4860]

82 GMC 1500 "F" engine....

[@EdontheBeach]

i'm not sure there is a 'spec' for APT. like you i've built a lot of these, i just set it up at about 3 or 4 turns up from the bottom and adjust from there. if yours is lean on the highway, try turning the APT up a quarter turn at a time or maybe your jets are too lean. watch part 2 for a bit of tuning info. i never grind on a carb, so won't offer any advice there - as far as i will go is drill for new bushings

[@Caveman4860]

The 'grinding' I was referring to, was the Tiny drilled holes on the outside of fuel bowl, buy the Secondary's. There's a boss there, I've just eliminated that joining boss, for a little more Fuel volume in the bowl. That's all. I'm at 4.5 turns out now (on rod adjustment). Thank You, for Your Time! 73 -Thom

[@EdontheBeach]

it doesn't - the top 'flaps' open when the carb sees X amount of vacum as the secondaries ('back bottom flaps') are opened - by the linkage on the driver side.

[@MemE-cd6jw]

Sir I have watched this video several times. Yesterday I followed your video while taking my Carburetor air horn off. My issue is the fuel pick up tubes. The fuel pick up tubes for the secondaries on the bottom of the air horn were laying in the bowl. I tapped them back into place, and reassembled. Yet they have come loose again after just a short drive. Do you have any suggestions for me on how to keep them in place. Is there a glue or compound I can use so they wont keep coming out?

[@EdontheBeach]

no, i would not use any type of glue or compound - to much opportunity to mess something up. find some kind of tapered tool, like maybe a pick, down the tube to expand it - BE CAREFUL, don't overdo it. once you expand it too far....

[@pauljohnson4846]

Lock tight red .

[@halopersin]

all those people raking on holleys about the power valves havent used a new holley with the check ball system or installed one they may not be 100% effective but it takes the downfall of the best carb on the market and pretty well fixes it.

[@EdontheBeach]

thanks buddy, i appreciate it - the hope was to make it less confusing, so i did something right. yeah, getting to the right combo is the difficult part, but still, it's fun messin' with cars!

[@Cisco_on_it]

have any idea why my primary or the first single flap is stuck open? lookn at yours I see they'be both closed. should it be closed?

[@starbattles1]

I have a stock 1987 monte carlo, 305 quardajet. motor. How can I find out what size jets I have? It has a 373 rearend, and 28" tires. It turns 2.3k rpm at 70mph and gets a horrible 16 miles per gallon. I knowa 5.0 litre carberated motor can do better then this. I had a 72 mach1 with a motor out of an 85 mustang H.O. and Holly 650. It got 23 mpg highway. After watching your video I am wondering if I can step the jets down 1 size and get better cruising mpg?

[@EdontheBeach]

the only way would be to open it up and look at them - the 3.73 rear end isn't helping your mpg (but it sure makes for a lot of fun when you push the long pedal). be careful with it, the Qjet on an '87 is wholly computer controlled. i don't mess with those and am not very savvy about them. i have used Guaranteed Carburetor out of Largo, FL for rebuilt computer carbs with excellent results. (no, i don't work or know anyone there)

[@starbattles1]

Thanks. I decided not to jet it and just change secondary needles to DP type. Smooth taper. I heard the stock ones are stepped for economy instead of performance.

[@EdontheBeach]

that wouldn't do anything for your mpg - in a stock 305 the only time the secondaries will even begin to crack open will be when you stomp at the starting line or cruise over 100mph. the chip that controls your carb, the jets and rods in your car are all set up for economy. nothing to be done about that. there was a time when JET and some other companies, including GM would sell you a performance chip...i doubt they are available anymore. the chip you have cannot be re-flashed

[@wildjoe330]

What normal everyday size jets would you use at 5,000 plus alt. ?

[@MrFang333333]

Mac K this is a good question. I am at high alt too and wondering what is going on vette.

[@kellyb897]

Hello I rejeted a 4ME Qjet. I put 50s Rods/68 jets. and lowered the Metering adjustment in 3 1/2 turns for better gas milage the problem is I don't think I have the rear / Front Breaks set right! I stumbles,no power at start, it Diesels when I shut off key. and sames times back fires. I did this before on my 76 4x4 350 4BBL. and I got it from 9.5 to 18.5 miles pre gallon. I was doing very good on gas.. but! this one is a 84 with a 350 $BBL. with Emission vac lines. the air pump seezed on me so I disconneted all of it! the town I Live don't have Smog Check.which is good. please send any info that will help! Kelly

[@C.dieslevonankwek7]

Sounds like you have a timing issue

[@EdontheBeach]

..be sure to watch part 2 - important stuff there

[@ernestogutierrez9731]

Como se carbura el cuadrajeep

[@richiesdetail1463]

just set it at its hightest idle for a both adjustments

[@36Bananapies]

You are an amazing teacher! Thank you so much for this video. You should do more; you have the gift of clarity and cadence.

[@kysondarren460]

I know Im asking the wrong place but does any of you know of a tool to log back into an Instagram account?? I was dumb forgot the login password. I appreciate any tricks you can offer me

[@maddoxcaiden3510]

@Kyson Darren Instablaster ;)

[@kysondarren460]

@Maddox Caiden Thanks for your reply. I found the site thru google and Im waiting for the hacking stuff atm. Takes a while so I will get back to you later with my results.

[@kysondarren460]

@Maddox Caiden It worked and I now got access to my account again. I am so happy! Thank you so much, you saved my account :D

[@maddoxcaiden3510]

@Kyson Darren you are welcome =)

[@robdixson196]

Lol i do the same thing putting fasteners and things back in place while diassembling. i tell myself i am sensible. But neurotic is a better description.🤣

[@makinbac0n]

I hate the fact that people buy a classic car and throw an Edelbrock 1405 or 6 on the car and chuck the Quadrajet... thinking they are going to get performance 1405 and 1406 are 650 CFM carbs and the stock Quadrajet is larger 687CFM( do know there are 2 sizes) and smaller primaries. The smaller primaries provide better fuel economy for cruising and the larger secondaries provide the fuel for the HP. I cant remember how many times I wish I had a Quadrajet over the 650 Edelbrock that was put on the car i bought... Also the Edelbrock is a square bore carb and the Rochester is a spread bore...

[@malindabelcher3810]

I have a 1984 ford f150 4x4 4 speed when I get In it and start going up the road it starts jerking while shifting into second and third gear can anyone tell me what to do about it

[@chrisbentley3468]

I've had carbs clog on me with white lithium grease

[@EdontheBeach]

try quadrajet parts dot com or carbs unlimited- they'll also have the good accelerator pump

[@Farmerjohnfabrication]

Does anyone know how many turn out the screw right behind the cruise metering rods is? I think that is my problem I have a dead spot when I step on it once it is past that spot it is fine

[@EdontheBeach]

that will depend on your engine. just start turning it it up or down half a turn at a time, then drive your car around. if it gets worse go the other way. when you get close, use 1/4 turns then 1/8 turns until the car acts the way you like it. watch part 2

[@starbattles1]

Hesitation when you first step on gas?(dead spot) then fine? Thats the accelerator pump. The adjustments those screws effect are not effecting what happens when you press that gas peddle. Only effects idle.

[@EdontheBeach]

i appreciate that, thanks. woodworking happens to be my other hobby.

[@EdontheBeach]

higher number = richer mixture

[@natep9744]

Hey EdontheBeach I got a bunch of carb questions for ya. Do you have an Email that i can message u at? The Carb I have questions on is the one thats on a honda accord 1986 dx.

[@RyenTheBeerGuy]

Dam wish my qjet looked tha cleen I want one like that

[@bodeine454]

Hang on a second, I'm only a few minutes into the video but you just stated that the secondaries don't come into play until almost wide open throttle and in your case a little more than halfway which correlates to over 100 mph. Uuum, what about when you want to pass someone on the road or you just want to tromp on the pedal just to get that 4 barrel rush, just hotrodding around on country roads etc etc? You don't have to be going 100 mph for that, those secondary barrels can come into play well before you get up to that kind of speed.

[@carloslabanca9356]

muy bueno-- lastima que no esta traducido en español---gracias

[@mcozpda3392]

Guiate con las imagenes ..lo unico interesante es que tienes que bajar las espreas de baja ..de 70 a 67 .. y ten cuidado cuando desarmes el carburador ..otro dato importante ..es cuando cambies la bomba de inyeccion ..cambiala por una de color rojo o azul ..que es de mejor material que las negras ..que son de ruber ..ya un material muy obsoleto a las gasolinas actuales ... solo fijate bien al desarmar y cuidado con las 4 pipitas ..que deben estar en su lugar .. saludos

[@EdontheBeach]

that's my baby! you can see a vid of it when you scroll thru my channel here - also a series of vids when i put the new 350 in it.

[@EdontheBeach]

oh yeah, sure, that'd be OK

[@heartbeatstorm983]

Its not brain surgery,, but you act like it is..

[@kellyb897]

Hay h you talk too! much. and using a needle on screws "COME ON' don't do repair video's go find a repair school and sit and learn......

[@Farmerjohnfabrication]

Does anyone know how many turn out the screw right behind the cruise metering rods is? I think that is my problem I have a dead spot when I step on it once it is past that spot it is fine

[@alext9067]

Have you checked the accelerator pump linkage for slack?