Quadrajet gettin' place, '81 k20 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

GSP7 · 11-18-2020, 11:13 AM

Can you recommend who/where to buy a quality rebuilt quadrajet carb for a '81 K20 350

Need to pass smog so has to be matching part number jetting, etc

Im pressed for time so, R&R, I will rebuild my old one later.

Usually some rebuilds redo the loose throttle plate shaft with bushings anyway

I have a couple old old links

Recommendations please...Thanks

Again , The carb has to have the same jetting so I can pass emissions test

Killer Bee · 11-18-2020, 02:24 PM

location?

I have had a couple of quadrajets rebuilt here over the past 25 years with good results..

being in socal, I'm sure they can set you up right https://jetchip.com/contact/ ask for Johnnie

his work is published in several articles and they catalog carbs outright at summit, jegs, etc.

good luck!

**MJN** · 11-18-2020, 05:22 PM

Quadrajet Power LLC would be my go to https://quadrajetpower.com/

I had mine rebuilt by them but they will either build one for you or may already have one ready for your application.

**K25alive** · 11-18-2020, 05:24 PM

Another option is SMI at www.smicarburetor.com. They rebuilt mine. nice work.

**bhc41051** · 11-18-2020, 06:26 PM

X2 for SMI

pound41 · 11-18-2020, 07:27 PM

I got a numbers correct quadra jet with the center fuel inlet for a 76 c10 454. a hard carb to fine from Quadrajet Power LLC They do great work

GSP7 · 11-18-2020, 09:26 PM

Ill have to call that Texas place, https://quadrajetpower.com/ tomorrow

They show the biggest selection... My truck is a 81 k20 , but the engine manufacture date on the air filter housing is 1980 .

My has the air choke..... which impossible to adjust so is works . It only works in below 40 or less weather

Do the electric chokes work properly...?.... looks like it can be converted to 'lectric

GSP7 · 11-18-2020, 10:46 PM

Hey Guys... Here is a great Qjet right up by Lars Grimsurd
http://corvette-restoration.com/wp-c...arb_Tuning.pdf

truckin 79 · 11-19-2020, 12:12 PM

I had to pass emmisions in CO a few years back and it was such a hassle. I took truck to a mechanic who barely looked at it and said rebuild carb. I said I did and he said I didnt do it right.......really you barely looked at it. I left there and never looked back. I bought a rebuilt carb from Rockauto and it failed emissions test worse then old carb I rebuilt, sent back to RA. I fooled around with old carb adjusting idle mixture screws using vacuum and tachometer, truck still failed. I was about to give up and send my carb in to be rebuilt to a professional. I am not knocking the professionals but for a stock 350 q-jet the 400-500 (that is on the low side of cost) was just to much for me to spend. Lucky for me I found the Restoring Rusty post and how he added a O2 sensor to dial in carb. Well I bought a AEM O2 wideband sensor for 180 from ebay. I had to pay another 30 for muffler shop to weld in O2 bung, so about 200 bucks total. The best investment I made in getting truck to pass emissions with my rebuilt carb. It took a little trial and error adjusting idle mixture screws but finally got air fuel to around 14:1 at idle and passed emissions.

Mike C · 11-20-2020, 07:58 PM

National Carburetors is another spot. I have one on order for an '85 C30 454.
http://www.nationalcarburetors.com/cat-chevytruck.html

**allchevy58** · 11-21-2020, 12:25 AM

I ordered an Autoline Carburetor from Rockauto for my 71' Monte Carlo, worked perfect. You can buy them almost anywhere, Autozone, Amazon, Ebay Etc. They guaranteed date code for application too.

GSP7 · 11-22-2020, 11:42 PM

Quote:

Originally Posted by allchevy58

I ordered an Autoline Carburetor from Rockauto for my 71' Monte Carlo, worked perfect. You can buy them almost anywhere, Autozone, Amazon, Ebay Etc. They guaranteed date code for application too.

Forgot about rock auto. They have several rebuilders listed , is Autoline special?

**allchevy58** · 11-23-2020, 11:35 PM

Quote:

Originally Posted by GSP7

Forgot about rock auto. They have several rebuilders listed , is Autoline special?

I don't know if they are special, but when I purchased they advertise they build the carb to your application and date code as if it came from the factory that way. I needed it because my carb guy was 6 weeks out. Autoline was highly recommended by my other car groups. Mine worked perfect.

TwoFiftyShifter · 11-24-2020, 12:17 AM

Emissions requirements on a 40 year old truck. That sounds horrible. Wish you didn't have to deal with that.

11-18-2020, 11:13 AM	#1
GSP7 Registered User Join Date: Sep 2012 Location: Idaho Posts: 652	Quadrajet gettin' place, '81 k20 Can you recommend who/where to buy a quality rebuilt quadrajet carb for a '81 K20 350 Need to pass smog so has to be matching part number jetting, etc Im pressed for time so, R&R, I will rebuild my old one later. Usually some rebuilds redo the loose throttle plate shaft with bushings anyway I have a couple old old links Recommendations please...Thanks Again , The carb has to have the same jetting so I can pass emissions test __________________ '81 K20 Silverado , '99 Dodge Cummins 4x4, '05 Dodge Cummins 4x4, Pinstriping-Lettering-Specialty Painting

11-18-2020, 02:24 PM	#2
Killer Bee Registered User Join Date: Jan 2016 Location: Barber City, CA Posts: 4,809	Re: Quadrajet gettin' place, '81 k20 location? I have had a couple of quadrajets rebuilt here over the past 25 years with good results.. being in socal, I'm sure they can set you up right https://jetchip.com/contact/ ask for Johnnie his work is published in several articles and they catalog carbs outright at summit, jegs, etc. good luck! __________________ *I started out with nothing - and I still have most of it*

11-18-2020, 05:22 PM	#3
MJN Registered User Join Date: Feb 2000 Location: Maquoketa, Ia/ Orr, Mn Posts: 3,051	Re: Quadrajet gettin' place, '81 k20 Quadrajet Power LLC would be my go to https://quadrajetpower.com/ I had mine rebuilt by them but they will either build one for you or may already have one ready for your application. __________________ '51 South Bend Model "9A" '56 Chevy 3600 NAPCO '74 Chevy Cheyenne Super K20-restored on 37's '72 GMC Sierra Custom K2500- in progress '08 GMC Envoy Denali '12 GMC Sierra 2500HD Denali '17 GMC Yukon XL VCCA member #58596 http://www.nohrco.com

11-18-2020, 05:24 PM	#4
K25alive Registered User Join Date: Jun 2015 Location: Portland, OR Posts: 274	Re: Quadrajet gettin' place, '81 k20 Another option is SMI at www.smicarburetor.com. They rebuilt mine. nice work.

11-18-2020, 06:26 PM	#5
bhc41051 Senior Member Join Date: Apr 2012 Location: Otway OH Posts: 788	Re: Quadrajet gettin' place, '81 k20 X2 for SMI

11-18-2020, 07:27 PM	#6
pound41 Registered User Join Date: Dec 2002 Location: Northern Virginia Posts: 1,268	Re: Quadrajet gettin' place, '81 k20 I got a numbers correct quadra jet with the center fuel inlet for a 76 c10 454. a hard carb to fine from Quadrajet Power LLC They do great work

11-18-2020, 09:26 PM	#7
GSP7 Registered User Join Date: Sep 2012 Location: Idaho Posts: 652	Re: Quadrajet gettin' place, '81 k20 Ill have to call that Texas place, https://quadrajetpower.com/ tomorrow They show the biggest selection... My truck is a 81 k20 , but the engine manufacture date on the air filter housing is 1980 . My has the air choke..... which impossible to adjust so is works . It only works in below 40 or less weather Do the electric chokes work properly...?.... looks like it can be converted to 'lectric __________________ '81 K20 Silverado , '99 Dodge Cummins 4x4, '05 Dodge Cummins 4x4, Pinstriping-Lettering-Specialty Painting

11-18-2020, 10:46 PM	#8
GSP7 Registered User Join Date: Sep 2012 Location: Idaho Posts: 652	Re: Quadrajet gettin' place, '81 k20 Hey Guys... Here is a great Qjet right up by Lars Grimsurd http://corvette-restoration.com/wp-c...arb_Tuning.pdf __________________ '81 K20 Silverado , '99 Dodge Cummins 4x4, '05 Dodge Cummins 4x4, Pinstriping-Lettering-Specialty Painting

11-19-2020, 12:12 PM	#9
truckin 79 Registered User Join Date: Jun 2014 Location: CO Posts: 749	Re: Quadrajet gettin' place, '81 k20 I had to pass emmisions in CO a few years back and it was such a hassle. I took truck to a mechanic who barely looked at it and said rebuild carb. I said I did and he said I didnt do it right.......really you barely looked at it. I left there and never looked back. I bought a rebuilt carb from Rockauto and it failed emissions test worse then old carb I rebuilt, sent back to RA. I fooled around with old carb adjusting idle mixture screws using vacuum and tachometer, truck still failed. I was about to give up and send my carb in to be rebuilt to a professional. I am not knocking the professionals but for a stock 350 q-jet the 400-500 (that is on the low side of cost) was just to much for me to spend. Lucky for me I found the Restoring Rusty post and how he added a O2 sensor to dial in carb. Well I bought a AEM O2 wideband sensor for 180 from ebay. I had to pay another 30 for muffler shop to weld in O2 bung, so about 200 bucks total. The best investment I made in getting truck to pass emissions with my rebuilt carb. It took a little trial and error adjusting idle mixture screws but finally got air fuel to around 14:1 at idle and passed emissions. __________________ 79 Chevy 2wd BIG10 350 TH400

11-20-2020, 07:58 PM	#10
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,727	Re: Quadrajet gettin' place, '81 k20 National Carburetors is another spot. I have one on order for an '85 C30 454. http://www.nationalcarburetors.com/cat-chevytruck.html __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax

11-21-2020, 12:25 AM	#11
allchevy58 Senior Member Join Date: Aug 2011 Location: Reno, Nv. Posts: 1,440	Re: Quadrajet gettin' place, '81 k20 I ordered an Autoline Carburetor from Rockauto for my 71' Monte Carlo, worked perfect. You can buy them almost anywhere, Autozone, Amazon, Ebay Etc. They guaranteed date code for application too. __________________ 1927 Willy's Knight 24,000 original miles, 1958 Impala 283/Powerglide, 1971 Monte Carlo 350/350, 1972 GMC K2500 350/350, 1976 Chev. K10 350/350, 2006 GMC Sierra 2500HD LBZ Duramax/Allison, 2006 Chev. Silverado K3500 LBZ Duramax/Allison

11-24-2020, 12:17 AM	#14
TwoFiftyShifter Registered User Join Date: Nov 2008 Location: Gwinnett GA Posts: 1,803	Re: Quadrajet gettin' place, '81 k20 Emissions requirements on a 40 year old truck. That sounds horrible. Wish you didn't have to deal with that. __________________ 1982 K10 SWB 1987 V20 - Sold - Doh!



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