ID carburetor

[vso737]

I have a Quadrajet 4 barrel built by CARTER for GM.............

The number is 7035530

I need to purchase a rebuilding kit for it.

Thank you in advance,
Mike

[wayne petty]

that circular number that is CAST in positive is NOT the carb number..


the carb number is stamped vertically.. on the drivers side of the float bowl...


it will have TWO lines of numbers...   stamped in.. on the left side of the float bowl...

some carter built carbs have the number stamped into the built by carter disc in the side of the float bowl.. .

that looks like a chevy carb from 67 or so.. perhaps 68...

[vso737]

"some carter built carbs have the number stamped into the built by carter disc in the side of the float bowl.. ."

Hi, thanks for the quick response............

I thought this  was ( attached photograph) the disc on the side of the bowl.  There are NO other numbers that I can find.

From what I gathered so far, the 703 designates a 1960's carb with A.I.R.

On a good number, the 4th digit designates the YEAR; the 4th digit (5) is a California car........the PROBLEM is the 6th digit (3) it does not coincide with any model car..........the last digit, the (0) designates an automatic since it is an even number.

The carburetor came with the 1968 307 SBC motor that I purchased with my project.

In the event that these are the ONLY numbers I can find, would any rebuilt kit for the 703 carburetor work??

Thanks,
Mike

[wayne petty]

on the left side of the float bowl... is there a round depression where something about the size of a dime might have  been..

carter tags were in that hole.. made like a DOG tag.. embossed from the rear..

i should have done this last night..

http://www.camaros.org/images/carb/carb_7027203-s.jpg


the entire link

http://www.camaros.org/carb.shtml

this seems to cover only 67 to 69...  i don't think personally they built them any later than those first few years..  but i could be wrong..

are you in need of a carb kit??? or trying to identify it for sale..

[vso737]

YES..............

I just came back from taking a look at the carburetor before I read your response.

I DO HAVE that circle but it is BLANK..........NO stamping on it at all.  It is right above the Quadrajet stamping and next to Carter Carburetor manufacture for GM.  All of this is on the opposite side of the numbers that I posted.

I will take a picture of it and posted.

I would like to get a REBUILT KIT and try to rebuild it myself.  Worse scenario, purchase an aftermarket Edelbrock.

I kind of like what I have read about the Quadrajet and would like to keep it if possible.

Thanks for all the help...........I will look up the stuff you sent me.

LG,
Mike

[wayne petty]

i am going to dig out my walker carb parts binder..  its 4 inches thick..  i will have some idea of what you will need in an hour or two...

do post which parts store you like to shop at...

AZ    O.   PB    so i can get the right number to you.. there are a few variations..

and the binder is under and behind a few things..  or i would already have it out..  i thought i had a digital copy but i cannot find it in my hard drive..

[vso737]

Thanks Wayne,

I shop at both places.................

I would think that the number on the float bowl would be pretty close to the CARB ID #.........since it starts with "703" ..........just my guess.

The ONLY other numbers stamped on this carburetor is a # 32 on the corner of the AIRHORN and directly below it on the FLOAT BOWL the same #32.  I guess it is to show that they are matching parts to the same carburetor.

I have more pic's if you need them and can take some more.

I can't believe how many different kits there are out there............

Thank you very much for taking the time out to do this,
Mike

[wayne petty]

i found the individual parts PDF file online.

http://www.diplomat.cc/dl/qj_4bbl_4mv_4mc.pdf


if you have the early quadrajet.. the needle and seat base will be held down by a flange with 2 screws through it..  its shown on the last page of the above file...  as a 31-551..



Year,      needle and seat 31-,     pump 64-,      basegasket G-,   kit#      

73-74   350-454,        31-701,         64-273,      G842,      151037

72   350      31-542,         64-260,      G842,      15514

69-72   BBC      31-701,         64-260,     G842,      15518B

69-71    SBC      31-542,         64-264,      NA,      151033A

68    BBC      31-701,         64-198,      G581,      15428E

67-68   SB/BB      31-542,         64-220,      G581,      15431A      

65-67   SB/BB      31-551,         64-220,      G836/G581,   15290A


you will also note that the accelerator pump rods have different HEIGHTS when fully extended..

as for the threaded in needle and seats... the small block applications usually have the opening at .101  where the big block versions have the .131 opening..


this is on a quadrajet 4MV for probably the late 67 to 71 models with the threaded needle and seat..

http://www.corvettefever.com/techarticles/corp_1004_corvette_carburetor_rebuild/viewall.html


you will really want to read this article. on fixing the main well plug leaks..

http://www.highperformancepontiac.com/tech/hppp_1107_home_remedy_quadrajet_carburetor/viewall.html

you may NOT have to do it.. but its worth checking..

here is one on bushings and something on bringing back the color..

http://www.carcraft.com/howto/57178/index.html

and one for the back of your mind.. on slight modifications to the calibration and tuning..

http://www.highperformancepontiac.com/tech/hppp_0702_rochester_quadrajet_carburetor_tuning/viewall.html

[wayne petty]

for those with quadrajets... who want to perhaps tune them.. or swap them onto a different displacement engine from their original calibration..  you will want to download this file ...



http://www.corvette-restoration.com/resources/technical_papers/Q-Jet_Carb_Tuning.pdf


it shows the actual primary jet numbers.. primary jet rods... power valve spring... and secondary metering rod letters..

along with some fancy calculations of the amount of area for fuel flow..

why do it think that this chart is important..

i have never seen anything like it..  and i have wanted to produce one my self.. less the area calculations..

with this.. and some more info thats not hard to find on the web by googling the actual carb number you have.. you should be able to fine tune almost any quadrajet to get it fairly close to your displacement .  that is if you can find parts..


you may also want to print this chart....  of the secondary metering rods BY SIZE....

http://www.highperformancepontiac.com/tech/hppp_0311_rochester_quadrajet_carburetor/photo_26.html


i have seen a primary rod chart somewhere..


if you look at this link carefully.. there is a link to download this as a complete file... it has parts lists for individual carbs.. but also it gives the applications on many..
and you can actually do a find file and find many of the carb numbers..

http://www.tocmp.com/manuals/Carbs/Rochester/QJet/index.htm

this is the actual download link...

http://www.tocmp.com/manuals/Carbs/Rochester/QJet/1973/pdf/1973%20manual%20complete.pdf



this link shows some of the merc cruiser quadrajet calibrations..

http://www.boatfix.com/merc/bullet/93/93_15.PDF

and is a good tuning reference..