Thread: Carb Identification?

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Maybe you Rochester guru's can help me with this one. It's not so much actual carb identification as application. The carb is a Rochester 2G. It looks almost identical to the standard ones alot of us use, so I didn't bother to take a picture. Outwardly it looks like the garden variety 2G, with a couple of small exceptions. The fuel inlet has no filter. Threaded for 1/8 npt fitting. The base plate is aluminium and looks a little shorter, (thinner) than standard. The base plate is rectangular in shape, standard small base bolt pattern, and the hole on front drivers side is slotted. Inside the venturi is 1 inch instead of 1 3/32. Any Ideas?
I bought this rebuilt, NOS. I think it was an Olds application, but now cant remember. It was new, newly rebuilt, in box, but dumb a## me didnt write down number and application.
Oh, and just because you buy a rebuilt carb doesn't mean its right. I have had to play with adjustments to get to idle correctly, but I attributed problems to running 2 primary carbs instead of a primary and a secondary. The flat spot was bugging me and last couple of days it wanted to die at idle. So I checked and accelerator pump wasnt doing very good. This one had the leather one. So I got a std 2G kit at my local autozone and put what would fit in. I wasn't going to remove the base plate as the std gasket won't fit. But I got to looking and the gasket between baseplate and body didn't look like it matched properly, so I shined a flashlight down the venturi and could see light between body and base plate. So I removed it carefully so as not to ruin mounting gasket, and it didnt match. Fortunately the gasket in the kit did. I installed it and put it back on the rat. Runs and idles like a different carb. If it was a newly rebuilt 2010 I would suspect the worse before I put it on but as it was old stock I thought it would be of higher quality. Goes to show you not all was better, (back in the day).
Any help IDing this carb and application would be greatly appreciated. I have yey to find a mounting gasket yet. And I am not too good anymore at making them. Thanks to all

on the side or back is a #. It is an 8 digit number ( example 17080804, ect ) Get me that and I'll see what I can do. Some of those old Rochester 2 bbls were set up for Multiple carb use ( like 3 deuces or even a 4 deuce Man-a-fre ), and the baseplates were smaller to lower the fuel input.

Originally Posted by Weasel Diesel

on the side or back is a #. It is an 8 digit number ( example 17080804, ect ) Get me that and I'll see what I can do. Some of those old Rochester 2 bbls were set up for Multiple carb use ( like 3 deuces or even a 4 deuce Man-a-fre ), and the baseplates were smaller to lower the fuel input.

No Such luck. All my other 2G's have a number stamped into them. This one had a metal tag on one of the top screws, but was mostly torn off with no remnants of any numbers left. It's not a major deal, but I get obsessed and upset at the things I can't remember anymore. It seams to me it was late 50's or very early sixties application. I am also very currious what the cfm rating is. It used to be fairly easy to research this stuff, but the danged auto parts stores have gone to computer databases, and even where the parts were used many years later the data pre 70's is very incomplete. Whish my old parts books hadn't burned with my shop.