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Carburetor [message #314438]

Sat, 11 March 2017 17:28

davidlive

Messages: 143
Registered: November 2011
Location: Simi valley, Southern Cal...

Karma: -1

Senior Member

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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Re: Carburetor [message #314441 is a reply to message #314438]

Sat, 11 March 2017 18:06

davidlive

Messages: 143
Registered: November 2011
Location: Simi valley, Southern Cal...

Karma: -1

Senior Member

Deleted

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.

[Updated on: Sat, 11 March 2017 22:07]

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Re: Carburetor [message #314444 is a reply to message #314438]

Sat, 11 March 2017 18:26

A Hamilto

Messages: 4508
Registered: April 2011

Karma: 39

Senior Member

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.

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Re: [GMCnet] Carburetor [message #314445 is a reply to message #314441]

Sat, 11 March 2017 18:19

USAussie

Messages: 15912
Registered: July 2007
Location: Sydney, Australia

Karma: 6

Senior Member

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

-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of David
Morrison
Sent: Sunday, March 12, 2017 11:07 AM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Carburetor

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
--
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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Regards, Rob M. (USAussie) The Pedantic Mechanic Sydney, Australia '75 Avion - AUS - The Blue Streak TZE365V100428 '75 Avion - USA - Double Trouble TZE365V100426

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Re: [GMCnet] Carburetor [message #314449 is a reply to message #314445]

Sat, 11 March 2017 18:58

davidlive

Messages: 143
Registered: November 2011
Location: Simi valley, Southern Cal...

Karma: -1

Senior Member

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

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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Re: Carburetor [message #314451 is a reply to message #314438]

Sat, 11 March 2017 19:23

C Boyd

Messages: 2629
Registered: April 2006

Karma: 18

Senior Member

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

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Re: Carburetor [message #314454 is a reply to message #314451]

Sat, 11 March 2017 19:33

C Boyd

Messages: 2629
Registered: April 2006

Karma: 18

Senior Member

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]

C. Boyd
76 Crestmont
East Tennessee

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Re: Carburetor [message #314456 is a reply to message #314438]

Sat, 11 March 2017 19:47

davidlive

Messages: 143
Registered: November 2011
Location: Simi valley, Southern Cal...

Karma: -1

Senior Member

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

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.

[Updated on: Sat, 11 March 2017 19:48]

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Re: Carburetor [message #314457 is a reply to message #314456]

Sat, 11 March 2017 20:02

C Boyd

Messages: 2629
Registered: April 2006

Karma: 18

Senior Member

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

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Re: Carburetor [message #314458 is a reply to message #314438]

Sat, 11 March 2017 20:15

davidlive

Messages: 143
Registered: November 2011
Location: Simi valley, Southern Cal...

Karma: -1

Senior Member

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

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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Re: Carburetor [message #314460 is a reply to message #314458]

Sat, 11 March 2017 20:32

C Boyd

Messages: 2629
Registered: April 2006

Karma: 18

Senior Member

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

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Re: Carburetor [message #314463 is a reply to message #314460]

Sat, 11 March 2017 20:44

davidlive

Messages: 143
Registered: November 2011
Location: Simi valley, Southern Cal...

Karma: -1

Senior Member

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.

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Re: Carburetor [message #315174 is a reply to message #314438]

Tue, 28 March 2017 20:36

davidlive

Messages: 143
Registered: November 2011
Location: Simi valley, Southern Cal...

Karma: -1

Senior Member

Mad

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

Mad

Mad

David

Mad

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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Re: [GMCnet] Carburetor [message #315179 is a reply to message #315174]

Tue, 28 March 2017 21:07

jimk

Messages: 6734
Registered: July 2006
Location: Belmont, CA

Karma: 9

Senior Member

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.

On Tue, Mar 28, 2017 at 6:36 PM, David Morrison wrote:

> :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
> --
> 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.
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

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

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Re: [GMCnet] Carburetor [message #315253 is a reply to message #315179]

Thu, 30 March 2017 18:50

Tony Cook

Messages: 121
Registered: August 2014
Location: Torrance CA

Karma: 0

Senior Member

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

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Re: [GMCnet] Carburetor [message #315268 is a reply to message #315253]

Fri, 31 March 2017 00:05

jimk

Messages: 6734
Registered: July 2006
Location: Belmont, CA

Karma: 9

Senior Member

Go to another shop.

On Thu, Mar 30, 2017 at 4:50 PM, Tony Cook wrote:

> 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
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

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

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Re: Carburetor [message #315289 is a reply to message #314438]

Fri, 31 March 2017 15:08

davidlive

Messages: 143
Registered: November 2011
Location: Simi valley, Southern Cal...

Karma: -1

Senior Member

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.

David Morrison

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

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.

[Updated on: Fri, 31 March 2017 15:43]

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Re: Carburetor [message #315293 is a reply to message #315289]

Fri, 31 March 2017 15:53

Tony Cook

Messages: 121
Registered: August 2014
Location: Torrance CA

Karma: 0

Senior Member

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

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Re: [GMCnet] Carburetor [message #315342 is a reply to message #315293]

Sun, 02 April 2017 08:52

jimk

Messages: 6734
Registered: July 2006
Location: Belmont, CA

Karma: 9

Senior Member

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.

On Fri, Mar 31, 2017 at 1:53 PM, Tony Cook wrote:

> 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
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502

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