Quadrajet Carburetor Rebuild - The 1947 - Present Chevrolet & GMC Truck Message Board Network

LawMan02 · 01-23-2008, 10:51 AM

Is there anyone on this site that rebuilds Quadrajet 4 barrel carbs?

Eichorst69 · 01-23-2008, 10:56 AM

I've rebuilt a few but it's been about 10 years since the last one. There pretty simple.

Rob

stllookn · 01-23-2008, 11:09 AM

I've done a few...found the instructions pretty easy and basic. Make sure you have lots of clean table space (no kids, pets or wives around the area) and take your time. There is some excellent resources on the net as well as in the rebuild kit.

My72BB · 01-23-2008, 12:10 PM

I have rebuilt Quadrajets and had them rebuilt...I guess one of the questions is how many miles on you Quadrajet and why does it need a rebuild. If it is fairly low mileage then the throttle shafts should be ok. If it is a high mileage carb...the throttle shafts are probably worn and no matter how good you rebuild it as far as gaskets/getting everything back in the right place...Worn throttle shafts = vacuum leaks that you will chase forever.

Just another thought is the carbs are made out of pot metal and plated when new to protect the pot metal and eliminate any leaks in the pot metal. As these carbs age...the plating will were off. When this happens...you will chase all kinds of problems.

If you want to get a professional opinion...Call Greg with Sparky's Carburators in Milwaukee, WI. His number is (414) 447-7500.

He just rebuilt my Quadrajet off of my 75 Pontiac Grand Am 400 and it works like new...Not to mention the plating makes this carb look show quality. He is going to get my Quadrajet off of my 72 BB pretty quick and do the same thing. Cost is between $300.00 and $400.00...and well worth it. Quadrajets are the most underated carbs out there in my opinion.

Good luck on whatever you decide...Alan

aventur1 · 01-23-2008, 12:50 PM

While were on Quads, I need to lean mine out a little, getting a black build up on the exhaust tips. Which needle screws do I turn and how far. Or basic start all the way in and how many turns out? Location and which ones. Or at least years ago I thought if the exhaust was turning your tips black it was to rich, is that true. Carb works fine other than that.

cruiserman · 01-23-2008, 12:52 PM

Those screws only affect idle. You need to adjust the rods and/or jets to change off-idle mixture.

**El Jay** · 01-23-2008, 01:03 PM

Quote:

Originally Posted by cruiserman

Those screws only affect idle. You need to adjust the rods and/or jets to change off-idle mixture.

If memory serves, the Q-Jets don't have jets, only metering rods.
That's what makes them the most misunderstood & underrated carburetors.

I could very well be wrong.
It's been a LONG time since I messed with them.

aventur1 · 01-23-2008, 01:08 PM

Well mine has been excellent, starts right up, idles when it's very cold here in Idaho, like now! Touch the peddle it kicks down to a slower idle, no sputters or coughs, just think I"m running rich.

Husker · 01-23-2008, 01:25 PM

I just sent mine out last week to get rebuilt. Cliff Ruggles is where I sent it, he has written books on the Quadrajet. They are going to go through it completly, Bushings and everything new. Quoted price was around $370-$400.00. He tunes it according to what engine it will be going on.
I learned of him from this board.
Ron
http://www.cliffshighperformance.com/services.html

6872xtc · 01-23-2008, 01:37 PM

Sent mine to Sean Murphy Induction in CA. It made a huge difference in my roller cammed 462BB. Almost 3 week turnaround, but got my carb back & only $250.

woodridge · 01-23-2008, 11:28 PM

You might PM JHow66, he has done them in the past.

Eichorst69 · 01-24-2008, 12:31 AM

I agree 100% with My72BB.
Also, make sure you get it totaly clean.

Rob

cruiserman · 01-24-2008, 12:39 AM

Quote:

Originally Posted by El Jay

If memory serves, the Q-Jets don't have jets, only metering rods.
That's what makes them the most misunderstood & underrated carburetors.

I could very well be wrong.
It's been a LONG time since I messed with them.

Nah, there are replaceable primary and non-replaceable secondary jets.

pmpski_1 · 01-24-2008, 01:20 AM

I'm gonna rebuild mine within the next month. I have Cliff's book, a rebuild kit, and new throttle shaft bushings. Based on a conversation with the guy who sold me the rebuild kit (The Carburetor Shop, Eldon MO, mentioned in the book), it should be pretty straight forward. Follow the instructions, take your time, take good notes.

He did mention that the throttle shaft bushings should be done by a pro. Luckily I live near Carburetor Connection. They said they can do them. They also mentioned that they'll rebuild the Quadrajet for 245. Nice to know that I have a backup in case I run into problems.

I've done motorcycle carbs in the past, so I'm pretty confident this will go ok. Let's hope so

**Palf70Step** · 01-24-2008, 01:58 AM

gman69 has done a few in recent years.

Bus Ted Knuckle · 01-24-2008, 02:06 AM

you can buy remanufactured q-jets at advanced and auto zone for $150. They work great right out of the box.

SchreinerM · 01-24-2008, 03:06 AM

I just recently rebuilt mine. The kit was $25 or so from Autozone. First time I've done any carb work - it wasn't bad at all. Only about 2 hours worth of work.

aventur1 · 01-24-2008, 03:13 AM

Lot's to think about!!! I'm not sure how old mine is, well miage wise or if was rebuilt in the past. Not sure. I suppose they will ask for a core and at this point it seems to work or maybe I just don't know how a new or rebuilt one works. I know I only get about 10mpg driving it like my age @ 55, LOL. Other types? What's the smallest, efficient for a total stock 350? What CFM is the Quad? Would like a 500 CFM work. Daily driver here just around town no highway long distants.

cruiserman · 01-24-2008, 03:27 AM

Nearly all Qjets are 750CFM, but they are regulated by vacuum to what is needed. I would just rebuild the one you have. You can get gaskets from the carb shop in Garden City. You should be able to do better than 10MPG even with winter gas.

**truckdude239** · 01-24-2008, 04:09 AM

Quote:

Originally Posted by Bus Ted Knuckle

you can buy remanufactured q-jets at advanced and auto zone for $150. They work great right out of the box.

i got mine for 140 from advance auto parts

RicksTrucks · 01-24-2008, 06:45 AM

My neighbor has been rebuilding them for years. I think he charges about $250. Thinking about having him do a couple of mine.

BB72CHEVKT · 01-24-2008, 07:52 AM

Quote:

Originally Posted by 6872xtc

Sent mine to Sean Murphy Induction in CA. It made a huge difference in my roller cammed 462BB. Almost 3 week turnaround, but got my carb back & only $250.

I used SMI as well and was not that impressed. I am having a few issues.

LawMan02 · 01-24-2008, 08:24 AM

I'm definitely not going to give it a try. I've tryed on small motors, (lawnmowers, weedeaters, ect) and have failed terribly. Always ended up sending them off or throwing them away. I will either send it off to get rebuilt or buy a remanufactored. Thanks for the reply. I would love to give the work to a board member, so if you are interested please pm me. Randy

LawMan02 · 01-24-2008, 08:26 AM

Oh yeah, the truck is my GMC 4x4 with about 35,000 miles. Not sure if it's been rebuilt before but probably not.

Jim_PA · 01-24-2008, 10:23 AM

Quote:

Originally Posted by BB72CHEVKT

I used SMI as well and was not that impressed. I am having a few issues.

Mine works great - what kind of problems are you having?

01-23-2008, 10:51 AM	#1
LawMan02 Junior Member Join Date: Nov 2005 Location: Saint Francisville, Louisiana Posts: 157	Quadrajet Carburetor Rebuild Is there anyone on this site that rebuilds Quadrajet 4 barrel carbs? __________________ 1972 GMC K2500, stepside, stock 350, 4 speed. Former F/D truck with 32,000 miles, no rust. 1973 Jeep CJ 5, 304, 33's with side pipes 2008 GMC 2500HD, CC, SWB, D/A, SLT

01-23-2008, 10:56 AM	#2
Eichorst69 Registered User Join Date: Jan 2007 Location: South Florida Posts: 158	Re: Quadrajet Carburetor Rebuild I've rebuilt a few but it's been about 10 years since the last one. There pretty simple. Rob

01-23-2008, 11:09 AM	#3
stllookn Saving 1 truck at a time! Join Date: Aug 2001 Location: Kent, WA Posts: 6,465	Re: Quadrajet Carburetor Rebuild I've done a few...found the instructions pretty easy and basic. Make sure you have lots of clean table space (no kids, pets or wives around the area) and take your time. There is some excellent resources on the net as well as in the rebuild kit. __________________ '68 C20 Longhorn 50th Anniversary 400/TH400 '68 C20 Longhorn 50th Anniversary 468/TH400w/buckets '72 C20 Halfhorn (Longhorn w/o cab and front clip) '69 Flxible Cruiser (look up ugly in the dictionary)

01-23-2008, 12:10 PM	#4
My72BB Registered User Join Date: Oct 2007 Location: Fairfield, PA Posts: 503	Re: Quadrajet Carburetor Rebuild I have rebuilt Quadrajets and had them rebuilt...I guess one of the questions is how many miles on you Quadrajet and why does it need a rebuild. If it is fairly low mileage then the throttle shafts should be ok. If it is a high mileage carb...the throttle shafts are probably worn and no matter how good you rebuild it as far as gaskets/getting everything back in the right place...Worn throttle shafts = vacuum leaks that you will chase forever. Just another thought is the carbs are made out of pot metal and plated when new to protect the pot metal and eliminate any leaks in the pot metal. As these carbs age...the plating will were off. When this happens...you will chase all kinds of problems. If you want to get a professional opinion...Call Greg with Sparky's Carburators in Milwaukee, WI. His number is (414) 447-7500. He just rebuilt my Quadrajet off of my 75 Pontiac Grand Am 400 and it works like new...Not to mention the plating makes this carb look show quality. He is going to get my Quadrajet off of my 72 BB pretty quick and do the same thing. Cost is between $300.00 and $400.00...and well worth it. Quadrajets are the most underated carbs out there in my opinion. Good luck on whatever you decide...Alan

01-23-2008, 12:50 PM	#5
aventur1 Registered User Join Date: Aug 2007 Location: Boise, Idaho Posts: 676	Re: Quadrajet Carburetor Rebuild While were on Quads, I need to lean mine out a little, getting a black build up on the exhaust tips. Which needle screws do I turn and how far. Or basic start all the way in and how many turns out? Location and which ones. Or at least years ago I thought if the exhaust was turning your tips black it was to rich, is that true. Carb works fine other than that.

01-23-2008, 12:52 PM	#6
cruiserman Registered User Join Date: Dec 2006 Location: Idaho Posts: 210	Re: Quadrajet Carburetor Rebuild Those screws only affect idle. You need to adjust the rods and/or jets to change off-idle mixture. __________________ 72 C2500 LWB 402 Sierra Grande 05 Odyssey 08 Tundra

01-23-2008, 01:08 PM	#8
aventur1 Registered User Join Date: Aug 2007 Location: Boise, Idaho Posts: 676	Re: Quadrajet Carburetor Rebuild Well mine has been excellent, starts right up, idles when it's very cold here in Idaho, like now! Touch the peddle it kicks down to a slower idle, no sputters or coughs, just think I"m running rich.

01-23-2008, 01:25 PM	#9
Husker Registered User Join Date: Dec 1999 Location: Mid NE USA Posts: 2,212	Re: Quadrajet Carburetor Rebuild I just sent mine out last week to get rebuilt. Cliff Ruggles is where I sent it, he has written books on the Quadrajet. They are going to go through it completly, Bushings and everything new. Quoted price was around $370-$400.00. He tunes it according to what engine it will be going on. I learned of him from this board. Ron http://www.cliffshighperformance.com/services.html __________________ Member #111 68 C-10 Daily Driver 70 4x4 Project 76 Jeep CJ-5 Help Support the Board: http://67-72chevytrucks.com/vboard/payments.php He who knows nothing is closer to the truth than he whose mind is filled with falsehoods and errors. Thomas Jefferson

01-23-2008, 01:37 PM	#10
6872xtc Registered User Join Date: Jan 2006 Location: Grand Jct.,CO Posts: 59	Re: Quadrajet Carburetor Rebuild Sent mine to Sean Murphy Induction in CA. It made a huge difference in my roller cammed 462BB. Almost 3 week turnaround, but got my carb back & only $250.

01-23-2008, 11:28 PM	#11
woodridge Senior Member Join Date: Feb 2005 Location: Maynardville, Tn Posts: 3,030	Re: Quadrajet Carburetor Rebuild You might PM JHow66, he has done them in the past. __________________ SEMA Network- Protect our Hobby! 71 C30 in pieces, starting to come together. Click here for A Place For Tennessee Truck Enthusiest To Meet

01-24-2008, 12:31 AM	#12
Eichorst69 Registered User Join Date: Jan 2007 Location: South Florida Posts: 158	Re: Quadrajet Carburetor Rebuild I agree 100% with My72BB. Also, make sure you get it totaly clean. Rob

01-24-2008, 01:20 AM	#14
pmpski_1 Registered User Join Date: Jan 2006 Location: Seattle WA Posts: 505	Re: Quadrajet Carburetor Rebuild I'm gonna rebuild mine within the next month. I have Cliff's book, a rebuild kit, and new throttle shaft bushings. Based on a conversation with the guy who sold me the rebuild kit (The Carburetor Shop, Eldon MO, mentioned in the book), it should be pretty straight forward. Follow the instructions, take your time, take good notes. He did mention that the throttle shaft bushings should be done by a pro. Luckily I live near Carburetor Connection. They said they can do them. They also mentioned that they'll rebuild the Quadrajet for 245. Nice to know that I have a backup in case I run into problems. I've done motorcycle carbs in the past, so I'm pretty confident this will go ok. Let's hope so

01-24-2008, 01:58 AM	#15
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 47,083	Re: Quadrajet Carburetor Rebuild gman69 has done a few in recent years. __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God!

01-24-2008, 02:06 AM	#16
Bus Ted Knuckle Son of a gun Join Date: Jan 2007 Location: Hot Springs, Arkansas Posts: 1,636	Re: Quadrajet Carburetor Rebuild you can buy remanufactured q-jets at advanced and auto zone for $150. They work great right out of the box. __________________ Bill BEATERS ARE NEATER

01-24-2008, 03:06 AM	#17
SchreinerM Registered User Join Date: Oct 2006 Location: Oshkosh, WI Posts: 101	Re: Quadrajet Carburetor Rebuild I just recently rebuilt mine. The kit was $25 or so from Autozone. First time I've done any carb work - it wasn't bad at all. Only about 2 hours worth of work.



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01-24-2008, 03:13 AM	#18
aventur1 Registered User Join Date: Aug 2007 Location: Boise, Idaho Posts: 676	Re: Quadrajet Carburetor Rebuild Lot's to think about!!! I'm not sure how old mine is, well miage wise or if was rebuilt in the past. Not sure. I suppose they will ask for a core and at this point it seems to work or maybe I just don't know how a new or rebuilt one works. I know I only get about 10mpg driving it like my age @ 55, LOL. Other types? What's the smallest, efficient for a total stock 350? What CFM is the Quad? Would like a 500 CFM work. Daily driver here just around town no highway long distants.

01-24-2008, 03:27 AM	#19
cruiserman Registered User Join Date: Dec 2006 Location: Idaho Posts: 210	Re: Quadrajet Carburetor Rebuild Nearly all Qjets are 750CFM, but they are regulated by vacuum to what is needed. I would just rebuild the one you have. You can get gaskets from the carb shop in Garden City. You should be able to do better than 10MPG even with winter gas. __________________ 72 C2500 LWB 402 Sierra Grande 05 Odyssey 08 Tundra

01-24-2008, 06:45 AM	#21
RicksTrucks Senior Member Join Date: Jan 2005 Location: Claremore, OK 74017 Posts: 2,640	Re: Quadrajet Carburetor Rebuild My neighbor has been rebuilding them for years. I think he charges about $250. Thinking about having him do a couple of mine. __________________ 68 Short Stepside C-10 69 SWB C-10 70 Flatbed C-20 70 LWB C-20 BB402 70 LWB C-10 CST 70 LWB C-10 CST 71 Short Stepside Cheyenne C-10 72 LWB C-10 72 Blazer 4x4 4spd 95 Jeep Cherokee 4x4

01-24-2008, 08:24 AM	#23
LawMan02 Junior Member Join Date: Nov 2005 Location: Saint Francisville, Louisiana Posts: 157	Re: Quadrajet Carburetor Rebuild I'm definitely not going to give it a try. I've tryed on small motors, (lawnmowers, weedeaters, ect) and have failed terribly. Always ended up sending them off or throwing them away. I will either send it off to get rebuilt or buy a remanufactored. Thanks for the reply. I would love to give the work to a board member, so if you are interested please pm me. Randy __________________ 1972 GMC K2500, stepside, stock 350, 4 speed. Former F/D truck with 32,000 miles, no rust. 1973 Jeep CJ 5, 304, 33's with side pipes 2008 GMC 2500HD, CC, SWB, D/A, SLT

01-24-2008, 08:26 AM	#24
LawMan02 Junior Member Join Date: Nov 2005 Location: Saint Francisville, Louisiana Posts: 157	Re: Quadrajet Carburetor Rebuild Oh yeah, the truck is my GMC 4x4 with about 35,000 miles. Not sure if it's been rebuilt before but probably not. __________________ 1972 GMC K2500, stepside, stock 350, 4 speed. Former F/D truck with 32,000 miles, no rust. 1973 Jeep CJ 5, 304, 33's with side pipes 2008 GMC 2500HD, CC, SWB, D/A, SLT

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