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What's this Carb?

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Old September 12th, 2014, 02:49 PM
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What's this Carb?

I picked this Rochestor 4 jet up at an automotive flea market it caught my eye because of the giant disk on it, but I have no idea what is it for, the year, the model, the CFM or what carb kit I need. It does say GM and various other things like RP and Rochester, the number I do have yielded no matches anywhere 7011456. If anyone can help me I would appreciate it
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Old September 12th, 2014, 02:50 PM
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Old September 12th, 2014, 02:52 PM
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If there is a picture you need let me know.
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Old September 12th, 2014, 02:54 PM
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Old September 12th, 2014, 02:55 PM
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is that for propane/ng
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Old September 12th, 2014, 02:55 PM
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I'm not able to do multi picture posts...
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Old September 12th, 2014, 02:56 PM
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Originally Posted by pogo69
is that for propane/ng
I'm not sure I understand, could you elaborate?
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Old September 12th, 2014, 02:58 PM
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One more
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Old September 12th, 2014, 02:59 PM
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The stamp is very odd
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Old September 12th, 2014, 03:02 PM
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Originally Posted by 1978 Oldsmobile Omega
I'm not sure I understand, could you elaborate?
regulator for propane or natural gas conversion
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Old September 12th, 2014, 03:05 PM
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Originally Posted by pogo69
regulator for propane or natural gas conversion
I just looked up that kind of stuff, and some of the parts seem similar but it said it was for a generator, so I don't really get the system, what is it for and how does it work?
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Old September 12th, 2014, 04:04 PM
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Looks to me like it could be a governor setup.........
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Old September 12th, 2014, 08:08 PM
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Originally Posted by 1978 Oldsmobile Omega
The stamp is very odd
That's not the carb # it should have a triangular tag attached to a screw on top.I agree some sort of governor.
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Old September 13th, 2014, 04:29 AM
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I had a feeling it wasent because I haven't been able to decode it anywhere, and my issue is that it does not have the tag, but... Was there not years where the number was only 4 numbers, because it looks like someone tried to punch the number in the top by where the tag should be. It's a rough punch but it looks like someone did it themselves... Either they faked it or the tag was breaking down and they wanted the number known.
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Old September 13th, 2014, 06:00 AM
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The large vacuum actuator on the side of the carb is a vacuum actuated speed governor for a truck or bus application, used in the early 1960s by Chevy and GMC. Note parts number 69, 70, 71 on this exploded view.
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Old September 13th, 2014, 06:43 AM
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Originally Posted by joe_padavano
The large vacuum actuator on the side of the carb is a vacuum actuated speed governor for a truck or bus application, used in the early 1960s by Chevy and GMC. Note parts number 69, 70, 71 on this exploded view.
Wow that's pretty cool,thanks for the information, are these a common carb?
And would it have any uses on motors today? If so what kinds? And would the exploded views be this exact carb, I see that the number I did find on mine matches the same scheme as those part numbers. Thanks again
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Old September 13th, 2014, 07:06 AM
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I've got it now! So the previous owner stamped in all of the numbers except the 70 at the start so it is 7020029
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Old September 13th, 2014, 07:39 AM
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[QUOTE=1978 Oldsmobile Omega;743767]Wow that's pretty cool,thanks for the information, are these a common carb?
And would it have any uses on motors today? If so what kinds?

Pfffft yeah, I would buy a big orange BUS splash some Grateful Dead posters up in the windows paint some peace, love and arrows add some leaves and flowers all over that thing. Wrap a bandanna around your head and go cruisin. That would be a smokin' ride Jus' keep the windows open a crack to let a bit of the smoke out thou.
Put-er-ther.

Last edited by 76olds; September 13th, 2014 at 07:41 AM.
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Old September 13th, 2014, 07:48 AM
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Pfffft yeah, I would buy a big orange BUS splash some Grateful Dead posters up in the windows paint some peace, love and arrows add some leaves and flowers all over that thing. Wrap a bandanna around your head and go cruisin. Keep the windows open a crack to let a bit of the smoke out thou.
Put-er-ther.[/QUOTE]

Hey well there are some pretty cool old busses out there, I wouldn't mind one! And I only paid $5, can't go wrong and it's in nice shape. Now if only I had a bus...
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Old September 13th, 2014, 08:02 AM
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I'd check eBay - the 4GC carburetor is early fifties technology and not the greatest (the QJ is a better carb), and you'll probably never use it or any parts from it, but the commercial vehicle guys may be looking for these, and for the five bucks you spent, you may be able to turn it over into a nice profit.

- Eric
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Old September 13th, 2014, 08:06 AM
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Originally Posted by MDchanic
I'd check eBay - the 4GC carburetor is early fifties technology and not the greatest (the QJ is a better carb), and you'll probably never use it or any parts from it, but the commercial vehicle guys may be looking for these, and for the five bucks you spent, you may be able to turn it over into a nice profit.

- Eric
I defiantly agree, I assumed I couldn't go wrong for $5 and it's fun to decode them. And I would think a lot of them are just left to rot, I guess I will either hold onto it or see if anyone wants one in my area. Thanks for the help!
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Old September 13th, 2014, 06:46 PM
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Originally Posted by 1978 Oldsmobile Omega
I'm not able to do multi picture posts...
Did you see the symbol in this pic that looks like a pair of glasses or 2 P's.
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Old September 13th, 2014, 07:06 PM
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Originally Posted by Railguy
Did you see the symbol in this pic that looks like a pair of glasses or 2 P's.
railguy
Kind of strange how that worked out, I believe it says RP... Does it mean Rochester Production? that's all I got from the internet, it has a lot of little symbols.
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