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Dgas ?


Hey Dgas Post up the Carbs you have for sale smile

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No Holleys or Carter/Edel's, but I do have a PILE of Qjets. I'll put together a list of the stamping codes. I think I do have enough Holley parts to build a 750/780 except for the base plate though.

-- Edited by Dgas on Monday 18th of October 2010 05:22:59 AM

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yes please put together of them q-jet date codes, we may be doing business looking for a 66/7 model 283/327

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283 You will need to run one of these on that II . I know how to Trick them out biggrin



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Carburetor Technical Information

Background

early Rochester 4GC
First-Design 4GC ca. 1953

The Rochester 4-Jet carburetor was a downdraft four barrel carburetor produced by the Rochester Products Division of General Motors from 1952 until 1967. It was first used on Oldsmobile and Cadillac in 1952 and was used on GM, Packard and Studebaker cars and trucks into the mid 60's. The last application was on Chevrolet trucks in 1967.

The 4-Jet consists of a pair of two barrel carburetors back to back, with the primary side being similar in construction to the 2-Jet (2G, 2GC, 2GV) carburetor.

late 50's Olds 4GC
Oldsmobile 4GC ca. 1958

In the 1950's Rochester 4-Jet carbs and Carter WCFB's were used interchangeably on some applications. Many of these early 4-Jet carburetors used the same very small mounting flange as the WCFB carburetor (for example, Cadillac). Some later 4GC's used a larger flange size similar to that used on Carter AFB's, but narrower than the square bore Holley flange. When interchanging GM carbs of the 50's and early 60's, check the flange size on the manifold carefully.

buick 4GC carb
Buick 4GC ca. 1964

Rochester 4-Jet carbs came in three general versions:

  • 4G with manual choke
  • 4G with manual choke and governor in heavier trucks
  • 4GC with an automatic choke mounted on the side of the carburetor

Although the 4-Jet is generally referred to as a 'square-bore' carburetor, many had substantially larger secondary bores than primary bores, especially in early 1960's Buick and Pontiac versions. Also, while most 4-Jets had a cast iron throttle body, some of these Buick and Pontiac carbs had aluminum bases.

 

http://oldcarmanualproject.com/manuals/Carbs/Rochester/4-Jet/64RochesterServiceMan/index.htm


Exploded View of a Rochester 4G - 4GC Carburetor

Find the part you need by number:

Rochester 4G

 





-- Edited by TANGO on Monday 18th of October 2010 09:30:32 AM

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Thats some good info Tango . A good candidate for a sticky in a tech area. There is very little info from the knowing these days on them. I played w them a bit BITD. but always switched to AFB's as soon as money allowed. Forgot most of what I did know since. I probably have one or two 60-63 Buick or Olds 394 carbs laying around some where as well.

-- Edited by Dgas on Monday 18th of October 2010 12:56:12 PM

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oh yeah the infamous 4gc isnt a bad carb just gotta work them haha.

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Rebuilding a Worn-Out Rochester 4-Jet Carb


http://www.streetrodderweb.com/tech/0901sr_holley_repairs_rochester_carburetor/index.html

-- Edited by TANGO on Tuesday 1st of March 2011 07:13:23 PM

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RE: Dgas ?


Wonder how bad the bite is? Pretty high I'd guess. These carbs are pretty labor intense on a true complete rejuvenation.

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