[GMCnet] Carburetor

[David Morrison]

I'm in the process of rebuilding the carburetor, I ordered a rebuild kit from summit racing and they sent me Hygrade Carburetor repair kit 1580 Kit
V17024, but i believe it's not the correct one, so i called them back to verify and a different sales rep told me they didn't even have my carburetor
number in their system Rochester quadrajet 17053309, (403 Engine Federal Standard Non-ca)

is this the correct carburetor ?
or did the previous owner change it ?

I do have a Carburetor on a 1974 455 engine, but unable to locate it's number yet to see if it can be used instead.

http://s3.photobucket.com/user/DavidLive/media/1978%20GMC%20motorhome/IMG_20170218_171230_zpszjaaetqw.jpg.html

--
78 Royal #749
74 #136
Oversteer is when you hit the wall with the rear of the car, understeer is when you hit the wall with the front of the car. Hp is how fast you hit the
wall, and torque is how far you take the wall with you when you hit it.

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[David Morrison]

If i'm decoding that number correctly, the carburetor the previous owner installed 17053309 is off a 1973 chevy 1 barrel

170 : Prefix Code
5 : Decade Produced
5 - 1976-1979 (1705)
8 - 1980's (1708)
3 : Year Produced
3 : Model
0 - Monojet (1 bbl) Federal standards
1 - Two jet (2 bbl) Federal standards
2 - Quadrajet (4 bbl) Federal standards
3 - Monojet (1 bbl) California standards
4 - Two jet (2 bbl) California standards
5 - Quadrajet (4 bbl) California standards
6 - VariJet (2 bbl) Fed
0 : Division.
0, 1, and 2 all indicate Chevrolet.
4 - Buick
5 - Olds
6,7 - Pontiac
8 - Chev / Olds / GMC / Truck Non comp
9 : Transmission
Even numbers - Automatic Transmission
Odd numbers - Manual Transmission

[Rob Mueller]

David,

Here you go:

http://gmcmotorhome.info/engine.html#carb

BTW you can save yourself a lot of aggravation and frustration by book
marking Gene's website and checking it before you order stuff for your GMC.

There are very few parts people around anymore that even know what a GMC
motorhome looks like let alone what parts it uses!

Regards,
Rob M.
The Pedantic Mechanic
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808

[A.]

davidlive wrote on Sat, 11 March 2017 17:28

> I'm in the process of rebuilding the carburetor, I ordered a rebuild kit from summit racing and they sent me Hygrade Carburetor repair kit 1580
> Kit V17024, but i believe it's not the correct one, so i called them back to verify and a different sales rep told me they didn't even have my
> carburetor number in their system Rochester quadrajet 17053309, (403 Engine Federal Standard Non-ca)
>
> is this the correct carburetor ?
> or did the previous owner change it ?
>
> I do have a Carburetor on a 1974 455 engine, but unable to locate it's number yet to see if it can be used instead.
>
> http://s3.photobucket.com/user/DavidLive/media/1978%20GMC%20motorhome/IMG_20170218_171230_zpszjaaetqw.jpg.html

Correct carb for a 1978 with a 403 in California would have been 17058559. Everywhere else was 17058254. Correct carb for the 455 in 1974 would have
been 7043254.
--
73 23' Sequoia 4 Sale
73 23' CanyonLands Parts Unit 4 Sale
Upper Alabama
"When I grow up I am going to be a curmudgeon."

[David Morrison]

both of mine are stamped in a circle on the rear of the carburetor

the 1978 royal 403 engine 17053309, doesn't match any of the numbers on gene's site for 78
http://s3.photobucket.com/user/DavidLive/media/1978%20GMC%20motorhome/IMG_20170218_170818_zpsnoksofug.jpg.html

the 1974 painted desert 455 engine, this one is hard to read i think it's 7037895 and doesn't match any of the numbers on gene's site for 73/74
http://s3.photobucket.com/user/DavidLive/media/1974%20GMC%20Motorhome/IMG_20170311_162100_zpsiqkozijn.jpg.html


so neither one is the correct carburetor for my 403 engine ...


Thanks David

[Charles Boyd]

The carb number should be stamped not cast. I believe it runs vertical.



davidlive wrote on Sat, 11 March 2017 18:28

> I'm in the process of rebuilding the carburetor, I ordered a rebuild kit from summit racing and they sent me Hygrade Carburetor repair kit 1580
> Kit V17024, but i believe it's not the correct one, so i called them back to verify and a different sales rep told me they didn't even have my
> carburetor number in their system Rochester quadrajet 17053309, (403 Engine Federal Standard Non-ca)
>
> is this the correct carburetor ?
> or did the previous owner change it ?
>
> I do have a Carburetor on a 1974 455 engine, but unable to locate it's number yet to see if it can be used instead.
>
> http://s3.photobucket.com/user/DavidLive/media/1978%20GMC%20motorhome/IMG_20170218_171230_zpszjaaetqw.jpg.html


--

C. Boyd
76 Crestmont
East Tennessee

[Charles Boyd]

In this pic of throttle lever side (driver)
http://s3.photobucket.com/user/DavidLive/media/1978%20GMC%20motorhome/IMG_20170218_170747_zpswrlini0k.jpg.html
There is a dirty vertical flat under the round thingie. Clean it off and look for number.




[xquote title=C Boyd wrote on Sat, 11 March 2017 20:23]The carb number should be stamped not cast. I believe it runs vertical.

davidlive wrote on Sat, 11 March 2017 18:28
> I'm in the process of rebuilding the carburetor, I ordered a rebuild kit from summit racing and they sent me Hygrade Carburetor repair kit 1580
> Kit V17024, but i believe it's not the correct one, so i called them back to verify and a different sales rep told me they didn't even have my
> carburetor number in their system Rochester quadrajet 17053309, (403 Engine Federal Standard Non-ca)
>
> is this the correct carburetor ?
> or did the previous owner change it ?
>
> I do have a Carburetor on a 1974 455 engine, but unable to locate it's number yet to see if it can be used instead.
>
> http://s3.photobucket.com/user/DavidLive/media/1978%20GMC%20motorhome/IMG_20170218_171230_zpszjaaetqw.jpg.html

[/quote]

[David Morrison]

I finally found it, wow, THANK YOU C BOYD it was covered in dirt .... wow one of those moments ... Thank everyone here for putting up with me, and
guiding me to patience and finding the correct stuff

the 1978 royal has the correct carburetor in it 17058254
http://s3.photobucket.com/user/DavidLive/media/1978%20GMC%20motorhome/IMG_20170311_173453_zpsizmd75lw.jpg.html

the 1974 painted desert, has 7029241 which doesn't match gene's site
http://s3.photobucket.com/user/DavidLive/media/1974%20GMC%20Motorhome/IMG_20170311_173620_zpstynegk4n.jpg.html


Thanks David

[Charles Boyd]

Does the 74 carb gas inlet come in the front as all Olds carbs or from the side as other brand Q-jets? 7029 is a 1969 # but 241 doesn't seem to be
Olds.
http://442.com/oldsfaq/ofcrb.htm#Carbs

davidlive wrote on Sat, 11 March 2017 20:47

> I finally found it, wow, THANK YOU C BOYD it was covered in dirt .... wow one of those moments ... Thank everyone here for putting up with me, and

> guiding me with patience to finding it correctly.

>
> the 1978 royal has the correct carburetor in it 17058254
> http://s3.photobucket.com/user/DavidLive/media/1978%20GMC%20motorhome/IMG_20170311_173453_zpsizmd75lw.jpg.html
>
> the 1974 painted desert, has 7029241 which doesn't match gene's site
> http://s3.photobucket.com/user/DavidLive/media/1974%20GMC%20Motorhome/IMG_20170311_173620_zpstynegk4n.jpg.html
>
>
> Thanks David

--

C. Boyd
76 Crestmont
East Tennessee

[David Morrison]

yeah, the fuel comes from the front, the previous owner of that engine, well he tinkered, he did convert it to hei ignition from points, he had the
engine rebuilt, he had those roller rocker arms on it, and did other things as well.

according to guide online it's from a 1969 4 barrel Q-jet Federal standard Buick with a Manual transmission ...
http://www.route66hotrodhigh.com/DecodeQjet.html

Thanks David

[Charles Boyd]

That Buick mt carb is rare. Bout as rare as an Olds mt carb. Hang on to it or use it. Olds cranks are not drilled for a pilot bearing for a
straight shift trans unless it came with an oem straight shift.



davidlive wrote on Sat, 11 March 2017 21:15

> yeah, the fuel comes from the front, the previous owner of that engine, well he tinkered, he did convert it to hei ignition from points, he had
> the engine rebuilt, he had those roller rocker arms on it, and did other things as well.
>
> according to guide online it's from a 1969 4 barrel Q-jet Federal standard Buick with a Manual transmission ...
> http://www.route66hotrodhigh.com/DecodeQjet.html
>
> Thanks David


--

C. Boyd
76 Crestmont
East Tennessee

[David Morrison]

the 74 is being made into a trailer and is stripped down to the shell, i would be willing to sell that carburetor and any other parts if you know
someone that's interested, just email me a offer

Thanks David
--
78 Royal #749
74 #136
Oversteer is when you hit the wall with the rear of the car, understeer is when you hit the wall with the front of the car. Hp is how fast you hit the
wall, and torque is how far you take the wall with you when you hit it.

[Bob Dunahugh]

The carburetor in our 78 403 is 17058559. Sometimes carb numbers change during the year. This GMC was built in January of 78. Our other 78 403 GMC was built in December of 77. I believe there's 122 VIN's between them. I'll check the carb numbers on it tomorrow. Be interesting.

Bob Dunahugh

[Bruce Hart]

FYI
Handy reference for carb numbers!

http://www.carburetion.com/Number/bynumber.asp

--
Bruce Hart
1976 Palm Beach
Milliken, Co
GMC=Got More Class

[Bruce Hart]

For carb kits and parts go here.

http://quadrajetparts.com/quadrajet-carburetor-rebuild-kits-c-128_33.html?sort=3a

[Bob Dunahugh]

Just checked the other carb on the 78 - 403. Same 17058559 carb. So this is the number for Dec of 77, and Jan of 78. Bob Dunahugh

________________________________
From: Bob Dunahugh <yenk...@hotmail.com>
Sent: Saturday, March 11, 2017 11:42 PM
To: gmc...@list.gmcnet.org
Subject: RE: Carburetor

[David Morrison]

:x

So today i went to smog with the rebuilt carburetor my brother did and it failed HORRIBLY as a gross polluter, so i tired to lean it out and even with
the mixture screws all the way in, the engine still runs and they had it on the machine measuring it and wasn't changing the amount roughly 3000 hc
(ppm) at idle, it's a BAD carburetor

:x David :x

[Jim Kanomata]

You are miss lead, lean is not good as there is now less gas to ignite.
I help at least 3-5 people per month pass smog.

--
Jim Kanomata
Applied/GMC, Fremont,CA
ji...@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502

[Tony Cook]

God I really hate the Smog racket here in Cali especially when they say ' There's no Cats 'and you have to tell them over and over they didn't come
with em. I feel your pain.
--
Tony Cook
77' Kingsley ' SuperSession 77 '
Torrance Beach,CA

[Jim Kanomata]

Go to another shop.

--
Jim Kanomata
Applied/GMC, Fremont,CA
ji...@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502

[David Morrison]

something went wrong with the rebuild of the carburetor in order to throw up those numbers, so I acquired another carburetor, and installed it and
took it up there and it has some minor issues with 500+ HC when at low idle under 1100 rpm , but at 1100+ idle it PASSED with flying colors (62 HC),

still need to tweak the fuel mixture and as I had it extra lean(only 1 turn out on the mixture screws), the engine had no power to it at that point,
and I need to replace the automatic choke as the rivets are falling out of it.



David Morrison

P.S. hopefully California will pass sb-1239 for pre-1981 exception.

[Tony Cook]

I hope it passes too and they go back to the rolling 25 year exempt. So lame

--
Tony Cook
77' Kingsley ' SuperSession 77 '
Torrance Beach,CA

[Jim Kanomata]

I feel the state will not roll back.
Once you have things running like it should, you'll find that the smog test
will not be a problem.

--
Jim Kanomata
Applied/GMC, Fremont,CA
ji...@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502