Rochester Mystery Carb Numbers [Archive] - Team Camaro Tech

: Rochester Mystery Carb Numbers


daverichard
Dec 24th, 02, 10:51 AM
I just removed the quadrajet from my 68. I am deciding whether to have it restored or not. I am trying to decode it, but it does not seem to have numbers in the normal format. On the housing (right where Chevy By The Numbers says they should be) are the following numbers: 292231Y then some space and the numbers 0189. I think the 0189 is the Julian date, but the other numbers don't seem to match anything I have read. Can anyone shed some light on where this carb came from? If that is the Julian date, then this can not be the original carb. Everything else on this engine has proven to be date correct so far. Any help is greatly appreciated!!

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Dave68RS/SS Convertible (http://home.attbi.com/~daverichard/camaro.html)
L48 (350/295 Powerglide)

elcamino
Dec 24th, 02, 11:28 AM
Sometimes the number is not complete. In this case I think the 70 prefix is not stamped

So the real number is 7029223 1Y

70 - Prefix code for 1965-69 carbs
2 - Decade produced 2=1960's
9 - year produced is 1969
2 - Model Q-Jet 4BBL federal standards
2 - GM Division 2=Pontiac
3 - Trans type odd=A/T
1Y - Customer code, aka broadcast code, This would show in a box on the build sheet as the carb code installed.

I found this carb number in the old interchange as being used on small block engines. Applications included Camaro's but this is coded for a Pontiac.

0189 is a date code as you know for 1969, 18th day Jan 18, 1969.

On page 154 of my 1965-69 CBTN it mentions the fact that the 70 could be missing on some carbs.

Someone may have swaped carbs or purchased a remanufacured carb from a parts supplier. The rebuilder would not have cared if the number was consitant with the correct model and division.

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2002 Pontiac TA WS6 Ram Air LS1, 6sp Hurst, TCS, CD Changer - Pewter "Last of the Breed" #3124 of only 12,516 WS6 built
2001 GMC SLT Extended Cab Z71 - Polo Green




[This message has been edited by elcamino (edited 12-24-2002).]

flowjoe
Apr 11th, 10, 05:53 PM
I just removed the quadrajet from my 68. I am deciding whether to have it restored or not. I am trying to decode it, but it does not seem to have numbers in the normal format. On the housing (right where Chevy By The Numbers says they should be) are the following numbers: 292231Y then some space and the numbers 0189. I think the 0189 is the Julian date, but the other numbers don't seem to match anything I have read. Can anyone shed some light on where this carb came from? If that is the Julian date, then this can not be the original carb. Everything else on this engine has proven to be date correct so far. Any help is greatly appreciated!!

------------------
Dave68RS/SS Convertible (http://home.attbi.com/%7Edaverichard/camaro.html)
L48 (350/295 Powerglide)

I know I'm resurrecting a very old post but...:D...one of my spare Qjets has the same code: 292231Y 0029.

Now I get elcamino's logic on the missing numbers but the thing is that Chevy Qjets have side feed fuel inlets while Pontiac uses a straight feed inlet - castings are different. I'll have to go back through my Qjet Pontiac references (it's in the garage) to see if there is an application for 7029223. Anyone have further thoughts on this?

dyno jonn
Apr 11th, 10, 06:10 PM
Put away those old Pontiac books FlowJoe....

That particular carb (or maybe just the center section) came off of a 69 Eldorado 472 with A/C. :yes:

flowjoe
Apr 11th, 10, 11:24 PM
Put away those old Pontiac books FlowJoe....

That particular carb (or maybe just the center section) came off of a 69 Eldorado 472 with A/C. :yes:

Thanks dyno jonn!:thumbsup: Are you positive about the Caddy usage? I did a few searches based upon a 7029223 number (previously just searched for the 292231) after finding this thread (and before digging out the Pontiac books:D). Came up with a '69 Chevy or GMC truck with 350 and MT....see here:

http://www.camaros.net/forums/showthread.php?t=158696

http://67-72chevytrucks.com/vboard/showthread.php?t=361476

http://www.chevelles.com/forums/showthread.php?p=581538

What d'ya think?

dyno jonn
Apr 12th, 10, 07:50 AM
OOPs, sorry. I screwed up on that. I looked up 233 instead of 223. The 7029223 is actually for a 69 Chevy truck with a 350. The info comes from my Rochester Carburetor parts catalogue. It's about 5 inches thick and lists all of the carburetors and the internal parts as far back as the late 40's up through the late 70's. I bought it back in the late 70's when I was working as a mechanic. Cost a whole $20.00, direct from Rochester Carburetor.

flowjoe
Apr 12th, 10, 12:57 PM
OOPs, sorry. I screwed up on that. I looked up 233 instead of 223. The 7029223 is actually for a 69 Chevy truck with a 350. The info comes from my Rochester Carburetor parts catalogue. It's about 5 inches thick and lists all of the carburetors and the internal parts as far back as the late 40's up through the late 70's. I bought it back in the late 70's when I was working as a mechanic. Cost a whole $20.00, direct from Rochester Carburetor.

I have an abridged version that a carb rebuilder let me copy - only covers Chevrolet and Pontiac. It's very handy and had I went out and looked through it for "7029223" I'd wager it would have shown up.

don't get too smug on that whole $20 thing;). Using 1979 as the year, I looked up the same amount in 2010 dollars = $59.71 (http://data.bls.gov/cgi-bin/cpicalc.pl). Almost be funny if it weren't sad.:):(