Is there a posting here on Carburetor identification?

Here's a few pics of my Rochester 2GV carburetor.

The driver's side.

2GV drivers side.JPG

Note the remains of the choke pull-off :oops: and the large tube poking out, that has an ugly hose clamped plug on the end.... What was that usually attached to? o_O

2GV pass side.JPG

The attachment spot on the intake for the divorced choke thermostat spring is visible on the left in this pic

2GV front.JPG

Here is the back view with the choke pull-off.. It was plastic and just fell to bits when I bumped it... :eek: Also, the plugged vacuum port at the bottom. Again, what's that pipe heading off to the right for?

2GV back.JPG

And the top view.... Is there anything that can be done to fix/hold together that crack in the air-cleaner stud hole? It seems to be holding on for now, but every time I tighten the air cleaner, I expect it to pull the stud out....

2GV top.JPG
 
The bracket that holds the choke pull off usually has a carb # on the reverse. This may be a replacement CPO, however it usually close enough to find a rebuild kit. This carb does have an power accelerator. It's in the bowl opposite the fuel inlet (front).
 
chromebumpers said:
The bracket that holds the choke pull off usually has a carb # on the reverse. This may be a replacement CPO, however it usually close enough to find a rebuild kit. This carb does have an power accelerator. It's in the bowl opposite the fuel inlet (front).
Click to expand...

I can't see a number on the bracket... This one?

2GV pass side arrow.jpg

Should I be able to see it, when its attached to the carb?
 
I can't see any numbers. There should be a 7 digit number on Rochesters, I've seen it on 67 and newer carb, can't say about a 65 if it's just tags alone. Your carb is almost identical to the Large jet 2G-GV that uses kit KT-5215A as seen in 68 and later 307s in Camaro, Nova, Chevelle and Monti Carlo. The mid year impala didn't have 307
Rochester Identification

You can usually find the carbs casting number and date code on the driverside of the carb stamped vertically.

A typical stamping;
7045213 YA
101 5

70 = Rochester products division#
45 = Production year, 4=1970's, 5=specific year, 1975
2 = Carb ID, 2=49 state Q-jet
1 = Division, 1=Chevrolet products
3 = Tranny ID*, Even number=Automatic, Odd number=manual
101 5 = Julian Date Code, Friday April 11 1975
YA = Engine assembly plant

# Carbs starting with 70xxxxx are pre-1976. Carbs starting with 170xxxxx are 1976 onwards.
An important note: Primary metering rods are different lengths for the two units, both rods are available from GM, and the new-part part numbers correspond with the carb. Rods whose p/n starts with a 7xyz are for the 70xxxxx carbs, and p/n 17xyz are for the 170xxxxx carbs.

* tranny ID is not cast in stone. This particular example was original equipment on an automatic equipped pickup truck.



Production Year
15 = 1960
19 = 1961
20 = 1962
2x = 1963-1969
3x = 1966-1967 A.I.R. equipped vehicles
4x = 1970-1975
5x = 1976-1979
8x = 1980-?

x=last digit of model year


Carb ID
0 = 49 state mono-jet
1 = 49 state 2bbl
2 = 49 state Q-jet
3 = California mono-jet
4 = California 2bbl
5 = California and high altitude Q-jet


Product Division
0,1,2 = Chevrolet
3 = Cadilllac
4 = Buick
5 = Oldsmobile
6,7 = Pontiac
8 = Non-GM, possibly Mercruiser Marine
9 = Special


Julian Date Code
From our above example code;
101 = Day of the year (1 thru 364/5)
5 = Last digit of manufacturing year. (0 thru 9). Utilize carb id for 60's, 70's, or 80's.
Some of those multiyear calanders with a look-up table have the Julian day of the year on them. If not, you'll just need to count out the days.


Engine Assembly Plant
YA = ?
FJY =?



Examples
Our example carb, 7045213
Is a Rochester carb, for the 1975 model year, 49 state (federal) Q-jet, Chevrolet Division with supposedly a manual transmission.
What it was originally installed on was a non-emmisions controlled 1975 3/4 ton Chevrolet Pickup truck with a 350 cubic inch engine and an AUTOMATIC transmission.
How about another? 17083222
Date Code 0183
Is a 1983 model year, 49 state Q-jet, Chevrolet division with an automatic tranny.
Manufactured on the 18th day of the year, in a year ending in 3. For, January 18 1983
Originally installed on a 1983 1/2 ton Chevy Pickup with a 305 and automatic tranny.

And one more for fun, 7043114
A 1973, 49 state 2bbl , Chevrolet division, with an automatic tranny.
Originally installed on a 1973 Nova w/350 and automatic tranny.

 
Last edited:
I was having a good time with the engine bay detailing until I made a stupid move.
I did an impeccable job on painting the valve covers. 3 Coates of the correct blue metallic and 1 coat of high heat Diamond Clear gloss. Looking at the covers under the garage lights I noticed some Orange peel. So with some 000 steel wool and some wet/dry sandpaper I lightly sand just enough to take out the OP. For a complete removal of any stray wool or contaminants I used the prep spray from Eastwood BIG F/Up at 3 am! All that great paint screwed!
 
Correction, the rebuild kit is KT - 5215 L

If you're not going to upgrade to power steering (which adding the parts are cheap and a really good idea), then I recommend cleaning up that junk in the back of the carb, among other things there's less to leak vacuum later.
 
chromebumpers said:
I can't see any numbers. There should be a 7 digit number on Rochesters, I've seen it on 67 and newer carb, can't say about a 65 if it's just tags alone. Your carb is almost identical to the Large jet 2G-GV that uses kit KT-5215A as seen in 68 and later 307s in Camaro, Nova, Chevelle and Monti Carlo. The mid year impala didn't have 307
Rochester Identification

You can usually find the carbs casting number and date code on the driverside of the carb stamped vertically.

A typical stamping;
7045213 YA
101 5

70 = Rochester products division#
45 = Production year, 4=1970's, 5=specific year, 1975
2 = Carb ID, 2=49 state Q-jet
1 = Division, 1=Chevrolet products
3 = Tranny ID*, Even number=Automatic, Odd number=manual
101 5 = Julian Date Code, Friday April 11 1975
YA = Engine assembly plant

# Carbs starting with 70xxxxx are pre-1976. Carbs starting with 170xxxxx are 1976 onwards.
An important note: Primary metering rods are different lengths for the two units, both rods are available from GM, and the new-part part numbers correspond with the carb. Rods whose p/n starts with a 7xyz are for the 70xxxxx carbs, and p/n 17xyz are for the 170xxxxx carbs.

* tranny ID is not cast in stone. This particular example was original equipment on an automatic equipped pickup truck.



Production Year
15 = 1960
19 = 1961
20 = 1962
2x = 1963-1969
3x = 1966-1967 A.I.R. equipped vehicles
4x = 1970-1975
5x = 1976-1979
8x = 1980-?

x=last digit of model year


Carb ID
0 = 49 state mono-jet
1 = 49 state 2bbl
2 = 49 state Q-jet
3 = California mono-jet
4 = California 2bbl
5 = California and high altitude Q-jet


Product Division
0,1,2 = Chevrolet
3 = Cadilllac
4 = Buick
5 = Oldsmobile
6,7 = Pontiac
8 = Non-GM, possibly Mercruiser Marine
9 = Special


Julian Date Code
From our above example code;
101 = Day of the year (1 thru 364/5)
5 = Last digit of manufacturing year. (0 thru 9). Utilize carb id for 60's, 70's, or 80's.
Some of those multiyear calanders with a look-up table have the Julian day of the year on them. If not, you'll just need to count out the days.


Engine Assembly Plant
YA = ?
FJY =?



Examples
Our example carb, 7045213
Is a Rochester carb, for the 1975 model year, 49 state (federal) Q-jet, Chevrolet Division with supposedly a manual transmission.
What it was originally installed on was a non-emmisions controlled 1975 3/4 ton Chevrolet Pickup truck with a 350 cubic inch engine and an AUTOMATIC transmission.
How about another? 17083222
Date Code 0183
Is a 1983 model year, 49 state Q-jet, Chevrolet division with an automatic tranny.
Manufactured on the 18th day of the year, in a year ending in 3. For, January 18 1983
Originally installed on a 1983 1/2 ton Chevy Pickup with a 305 and automatic tranny.

And one more for fun, 7043114
A 1973, 49 state 2bbl , Chevrolet division, with an automatic tranny.
Originally installed on a 1973 Nova w/350 and automatic tranny.
Click to expand...

Yeah, no numbers like on yours... The date of manufacture for the carb is up for debate... The origin of the engine and any attached parts is uncertain... It's not the original for certain.. The guy I bought it off was not sure and a little evasive as to details...

An expert in 60s cars produced in Australia who saw the engine even thought the engine may have originally been out of a 68-69 Aussie car.... Which makes the carb ID even less certain... But, it's likely old enough to be in the tag ID era...
 
chromebumpers said:
I was having a good time with the engine bay detailing until I made a stupid move.
I did an impeccable job on painting the valve covers. 3 Coates of the correct blue metallic and 1 coat of high heat Diamond Clear gloss. Looking at the covers under the garage lights I noticed some Orange peel. So with some 000 steel wool and some wet/dry sandpaper I lightly sand just enough to take out the OP. For a complete removal of any stray wool or contaminants I used the prep spray from Eastwood BIG F/Up at 3 am! All that great paint screwed!
Click to expand...

Ahhhhhhh, shhiiiiiiiiit.... That sucks... Redo..... :oops:
 
chromebumpers said:
Correction, the rebuild kit is KT - 5215 L

If you're not going to upgrade to power steering (which adding the parts are cheap and a really good idea), then I recommend cleaning up that junk in the back of the carb, among other things there's less to leak vacuum later.
Click to expand...

Do you have a link to the kit? I can't find it online...

It looks like a lot of the kits are fairly generic and if I get one for pre 68-69 I should have a good chance.....? Only way to be sure is probably to pull the carb apart and then cross match with pics online.... Then the car is off line for as long as it takes to order and wait for shipping... Not cool..

Good call on the junk on the back.... I'll look into that... There should be some sort of screw in plug?
 
In the tag era Rochechesters there is still redundant Id cast inside the float bowl. The numbers are in a small circle. So even if someone swapped the air horn a workable rebuild kit is obtainable. I'll see if I can capture the numbers in a photo sometime today.
 
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