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Author Topic:   rochester #'s
longracing25
Dirt Maniac

Total posts: 103
posted July 24, 2002 09:42 PM
Hey guys!....tried the search, but couldn't find anything. I know the "big bore" 2G carbs are the 2b of choice. My question is, they guys around here refer to the carbs as #114,#115,#116,#117,....saying the 114 basicaly, is not what yo want. the #116 is supposed to be GREAT, where are these 3 digit numbers on the carbs? My racer friends say these numbers are on the fuel bowl, but i can't find any on mine. I want one of the #116.....thanks.

racer17j
Dirt Forum Champ
Total posts: 1565
posted July 25, 2002 01:25 AM UIN: 54865418
they are right the #'s are on the bowl on the right hand side i have a 114 i got it from speedway i also have an old carb with no markings on it it's probably the same thing you have there. if it is it's not what your looking for. basicly if you want to go hunting look for a school bus with a 350 in it you will have to put it on a different base tho if and thats a big if you can find one

longracing25
Dirt Maniac

Total posts: 103
posted July 25, 2002 01:58 AM
yeah, i have a rochester 2b, the only # i can find , is on the metal tag...and it's not a 3 digit number, i'm told it's the number you go by to get a rebuild kit.So i can't figure out if it's a "keeper" or not.I have a 1972-1980(81) Chiltons manual, checked the number in that, but it was a lower number than those....so does that mean it's a 1971 or older?

KPLugnut
Dirt Freak

Total posts: 408
posted July 25, 2002 08:33 AM
Guys, maybe this will help you out. When racers are referring to the 2G's by 3 digit numbers, they are talking about the LAST 3 digits of the 7 digit (or 8 digit if it's newer than '76) number that is USUALLY found on the right side of the fuel bowl.
Some early 2G's did not have the # stamped there, but came with the tin metal tag attached to one of the front bowl screws.
One type of car, for example that came with the big 2G was the '71 Pontiac 455 motor. Most of them had 4bbls, but some were fitted with the big 2G. Grain trucks, some buses, etc were also a source, but as was stated above, the baseplate is different (governor, linkage, etc).
Almost ALL common 2G baseplates were of the same size, too, i.e., 1.687" throttle bore, and all had the same 3-bolt pattern.

At any rate, here is one of the many websites where the 7-8 digit numbers are explained....
http://www.carbs.net/quadnumber.htm

Hope that helps, and if anyone has troubles locating one of the hard-to-find big bore carbs, just let me know. I can get you one...
as well as anything else carb related...

KPLugnut
Kinetic Performance

[This message has been edited by KPLugnut (edited July 25, 2002).]

[This message has been edited by KPLugnut (edited July 25, 2002).]

longracing25
Dirt Maniac

Total posts: 103
posted July 26, 2002 01:59 PM
Yeah , i also found a guy who has a carb with the last 3 digits "116" (7040116) for sale.....guess what he wants only $5 for it....needs rebuilt, but it's a keeper,isn't it?

Brad haddix
Dirt Full Roller

Total posts: 56
posted July 26, 2002 02:28 PM
measure the venturis, if its inch and 3/8s you got a keeper regardless of #s

powerglides
Dirt Full Roller

Total posts: 69
posted July 29, 2002 10:44 AM
Quick tip, I always carry a long 3/8 bolt with me when I am looking at Roch 2 jet carbs, if the bolt will fit between the booster and the venturi bore its a big one 1 3/8 bore, buy it.

longracing25
Dirt Maniac

Total posts: 103
posted July 29, 2002 12:12 PM
so not ALL #116 are GOOD carbs? I thought ALL #116 and #118 were "big" bores.

KPLugnut
Dirt Freak

Total posts: 408
posted July 29, 2002 01:47 PM
That is true that NOT all 116's or 118's are going to be 1 3/8" venturi carbs. The only thing the 116 and 118 have in common is that the 6 and the 8 are both even numbers making
them carbs that came from automatic transmission vehicles (odd #'s were standard transmission cars/trucks).

Guys, you will find it much harder than you think to actually find a TRUE 1 3/8" venturi
2G carb....what most racers I've seen seem to think is a big bore, is nothing more than either a 1 1/4" or 1 5/16" carb.

Hope that helps,

Kinetic Performance

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