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Quadrajet question


I picked this up with a bunch of other stuff the other day. The previous owner was not sure of it originality other than it was from a mid sixties car. I could not find a date # or anything that can tell me what it is. I am asking anyone out there that can ID  this carb. Thanks 



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The number 704 should be somewhere on that carb, if it is a sixties Quadrajet (1965-1974). I hope i got that right. Good luck. 



-- Edited by long stroke on Saturday 3rd of November 2018 01:43:00 PM

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looks just like the one on my 66 327 linkage wise, part # on a round disc.



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This should help ID it

www.rodauthority.com/tech-stories/fuel-cooling/choose-your-quadrajet-number-identification-guide/

 

Just looking at the pics, it is for a Chevy, Old, Buicks etc had the fuel inlet sticking out the front, not to the side. And it is older, I would guess late 60s-early 70s. 



-- Edited by poncho62 on Saturday 3rd of November 2018 04:54:18 PM

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If the number 7032720 is the model number then the 4th last digit (2) indicates the year which would be 1962 or 1972. Don't believe there was a 1962.

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I have found the same carb on carbs unlimited and I believe it is a 7026200 used on 65-66 396&427 chev. Will it run a 327 or is only for big blocks?

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It is a 65-67 Quadrajet and the number would have been pressed into the disc on the side of the body in photo 3 on an insert sometimes silver, red, blue or green in colour. In 68 the numbers were stamped into the body closer to the rear. Without that insert you really can't say what number it is. It will work with proper adjustment on any GM engine with a spread bore intake. 



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the applicaton number for that car is MIA, all you're going to see is the casting numbers;
That funny round spot on the side of the fuel bowl by the throttle arm is where the 1966-1968.5 Quadrajets had an aluminum coloured disc affixed which had the manufacture date, and the application number.
The fuel bowl to me looks to be a Chevrolet casting, as far as I am aware, all but a few big block applications for Chevrolet received a side inlet fuel line.

Although improbable, it could also be a Cadillac unit, as those too received side inlet fuel lines.

There are ways to try to narrow down the original application, but from here, it's all uphill.

Just a note;
I see that '73SC' says it's a 65-67 casting;
I am unaware of 1965 Quadrajets being made - but I guess it is possible;
I do know that the Quadrajet was used for a year by Chevrolet before other divisions got to use the Quadrajet;
The first year Pontiac's could have a Quadrajet was 1967 - so to me at least, logically 1966 was the first year for Chevrolet - but I could be wrong.

The stamped disc application ID method was used during the 1967 calender year, which included early manufactured 1968 model year units.

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It looks like a 65-66 as the secondary air valves are dampened by the arm on the top left rear valve, rather than a link from the vacuum break on the other side.



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If I had to take a really educated guess based on my gut feel on that carb and using my own knowledge plus what unruhjonny has written I'd go with a 1967 327  Chevrolet. The side inlet tells us its a Chevy, Cadillac carbs are just way to hard to find even though they are side inlet.



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unruhjonny wrote:


I am unaware of 1965 Quadrajets being made - but I guess it is possible;

I do know that the Quadrajet was used for a year by Chevrolet before other divisions got to use the Quadrajet;

The first year Pontiac's could have a Quadrajet was 1967 - so to me at least, logically 1966 was the first year for Chevrolet - but I could be wrong.



Jonathon, there would have been a Quadrajet on Chevrolet in 1965 because of the 396, and the Pontiacs in 1966 because of the 396/427. At least I am quite sure of that. I've never seen anything but a Qjet or Holley on those years of 396/427.

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Check your parts books for the q jet intakes? Ive not had experience with anything much newer than a 64 and no q jet or bbs.

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I've put a lot of carb kits in quadrajets over the years and kept a lot of the spec sheets with numbers I'll see if I can find anything helpful to narrow this down.  I am a fan of the quadrajet and when I bought my 62 Parisienne with the factory 283 - 2bbl, I simply had to track down a period quadrajet.  A friend owns a NAPA store and he found this listing for a 62 Impala https://www.napacanada.com/en/p/ATAC983 so I bought it.  It's a front fuel supply setup.  I don't have access to any GM parts books to confirm the application but it's gonna work for me.



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I checked all the sheets I kept from various carb kits over the years, not surprisingly I can't find anything close.  I turned to my Motor's 1965 manual, which covers all North American and Volkswagen 1958 - 65.  If we look under Pontiac we find our American cousins.  During these years, if they had Rochester they all had 2 bbl except for 1958 which had a Rochester 4bbl and the 1965 tri-power.  The 4 bbl all appear to have been Carters.

Looking to Chevy for our Canadian cars 4bbl carbs seem to have been either Carter or Rochester.  The attached pic from the manual shows all the carbs for this period including a Holley 4150 but it was reserved for the 1964 - 65 Corvette, high performance, with duals, special cam and solid lifters.  The Rochester models for '58 - '65 had a 7 digit code all starting with 7.  In '58 they began with 701 and by '65 they were in the 702's.



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Poncho Master!

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That pic is a 4 gc Rochester the most common Chev/Cdn Pontiac carb from 59-64.



-- Edited by DonSSDD on Tuesday 17th of September 2019 05:48:37 PM

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Here are pictures of my Rochester 4GC used 58 - 65, hope it helps.  The fuel supply, primary, secondary and choke plate are totally different.  I think his carb is in the 69 - 70 era in part because of what looks like an early vacuum pod for the choke pull off and another primary vacuum port on the bottom left front, possibly for a PCV valve.  If memory serves me correctly, vacuum controlled emission devices started in 1970 with the gas crisis, which is why I think his carb is from that era.



-- Edited by Glenn Musgrave on Wednesday 18th of September 2019 11:19:47 AM



-- Edited by Glenn Musgrave on Wednesday 18th of September 2019 11:37:30 AM

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It has to be pre-1968 model year as it is the older Quadrajet body with the round disk. Carter made them after that with the old body but Rochester ones had the body change. As the disk is missing hard to say what it was. I can't see the assembly Julian date code on the base plate either so the base may have been changed for a 1968-9 plate. The most likely small block Chevrolet application will be 1967 327/240 or 1967 350/295. It may also be a big block carb off a lower power 396 or 427. Has to be off an engine that used the idle compensation valve on the back as well, not all Quadrajets used this. It aslo has the vented fuel bowl at the front just above the fuel inlet, the little rectangular cap is missing. From memory 1968 an dlater in the USA were sealed here and vented internally.

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All I know is its gotta be newer than 64

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Poncho Master!

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Heres an interesting post on qjets, it mentions that #RP29865 on the plate on this carb and speculates its a Julian calendar date code, day 298 of year 65. I found another ad on eBay with that number, so hard to say what that number means. 



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4SPEED427 said:

Jonathon, there would have been a Quadrajet on Chevrolet in 1965 because of the 396, and the Pontiacs in 1966 because of the 396/427. At least I am quite sure of that. I've never seen anything but a Qjet or Holley on those years of 396/427.
If you say that there were Rochester Quadrajets in production for the 1965 model year, I'll trust you.
When I referred to Pontiacs first recivieving a Quadrajet for 1967, in hindsight, I should have clarified I intended to mean Pontiac-USA, it is fairly well known that Pontiac-Canada, with the odd exception, used Chevrolet drivetrains, so that would explain any pre-1967 Pontiacs which recieved a Quadrajet.

I see that the Rochester 4GC was mentioned;
I hope no one is confusing a Quadrajet for a 4GC - they are wholly different units, the Quadrajet was a blank sheet new design four barrel, that I had previously understood was divisionally exclusive to Chevrolet for 1966 (maybe the 1965 396 was an early 1966 option??);
Some 1967 model year Pontiac-USA (and probably other divisions) 4 barrel applications still used a Rochester 4GC;
To the best of my understanding the Quadrajet replaced the 4GC for all GM brands across the board in 1968.
The 4GC may have been in production past 1967, but I am unaware of them being used in anything GM manufactured after 1967.

1) The trouble with any pre-1968 and early-1968 model year Quadrajets is that they used the stamped disc for the application number (see first attachment; the F1 indicated first week of June(I believe this example was manufactured in June 1967) the other letters are the pick code);

2) When the disc was removed from the Quadrajet assembly during the 1968 model year, and the application number started being stamped on the vertical flat (where it remained for the remainder of Quadrajet production) the assembly date code was initially stamped on the throttlebody (as DonSSDD mentioned; see circled area in second image for location, and third attachment for a date code on a 1968 Pontiac Quadrajet; 299th day of 1967);

3) The assembly date was only placed on the throttle body into the 1969 model year, when an abbreviated application number was used with the date behind it (see fourth attachment);
this was again changed during the 1969 model year, when the full application number returned, and hte assembly date was placed on a second line.

Hopefully that all makes sense.

The genesis of my knowledge in Quadrajets all lies in looking for a correct carb for my car - that wasn't restamped or monkeyed with.



-- Edited by unruhjonny on Monday 16th of December 2019 01:41:53 PM

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unruhjonny wrote:

 

If you say that there were Rochester Quadrajets in production for the 1965 model year, I'll trust you.


-- Edited by unruhjonny on Monday 16th of December 2019 01:41:53 PM


 I should add that would only apply to the US I guess because it appears we only had 409's for 65, no 396's.



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Unless of course they only put Holleys on 1965 396's in the US....

Interesting point, I'll have to check the US parts book.

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