#1  
Old 06-18-2024, 10:23 PM
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Default Air Cleaner history...

Hi fellas:

I have another thread going to track down a 70's carb as Cliff told me the carb that came with the car is of a cheby variety. I also have a vacuum leak so it seemed like a good time to rebuild or replace it anyways.

Anyway, he mentioned that the pontiac qjet is a different beast with the hoses on the other side and some kind of vent on the front.

He also mentioned that a 75 or later would have a larger oriface so I was wondering if whoever stuck the cheby carb in there butchered or made his own shaker base (that I have today) so maybe the pontiac q-jet won't fit it?

Can you tell by the pictures if I have the proper shaker base or will run into problems or should I start looking for a different base?

Thanks!

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'74 T/A 455 Y-code SD clone

previously on Dawson's Creek:

'74 T/A 400
'81 AMC SX/4
'69 FB 350
  #2  
Old 06-18-2024, 10:25 PM
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'74 T/A 455 Y-code SD clone

previously on Dawson's Creek:

'74 T/A 400
'81 AMC SX/4
'69 FB 350
  #3  
Old 06-19-2024, 09:37 AM
'ol Pinion head 'ol Pinion head is offline
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Aircleaner base is correct 1 1/2" drop for your '74. Shaker top came from '74 GTO but is dimensionally the same as '73-76 T/A, have several of each style.

For a Qjet, unless you've changed to an earlier intake like a '72, or '71 & earlier intake & matching ex crossover heads, I'd prob go with a '77-80 800 cfm Pontiac Qjet to rework Am not a big fan of the early integral choke 750 cfm Qjets like the 7043262, 7043262, the latter being what came on your '74. They can be gone through & reworked though.

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Last edited by 'ol Pinion head; 06-19-2024 at 09:43 AM.
  #4  
Old 06-19-2024, 10:50 AM
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it looks like a plug was added to the base;
1971-1979 Pontiac Quadrajets all have a "chimney" fuel bowl vent that protrudes into the air cleaner;
Chev carbs don't have this - which is probably why that plug was placed there.

1975+ Pontiac Quadrajets do have the "chimney" in a different spot than the 71-74 units - so a 1973-1974 air cleaner base might be best matched to a pre-1975 Quadrajet (otherwise your valve cover breather tube won't reach the hook up spot).

Something worth mentioning is that 1973-79(?) Pontiac Quadrajets can change from a heat sink style choke to an electric choke;
You just swap the element, and cap off the feed line.

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1970 Formula 400
Carousel Red paint on Black standard interior
A no-engine, no-transmission, no-wheel option car.
Quite likely one of few '70 Muncie three speed Formula 400's left.


1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing)
2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs)
  #5  
Old 06-19-2024, 04:13 PM
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Quote:
Originally Posted by 'ol Pinion head View Post
Aircleaner base is correct 1 1/2" drop for your '74. Shaker top came from '74 GTO but is dimensionally the same as '73-76 T/A, have several of each style.

For a Qjet, unless you've changed to an earlier intake like a '72, or '71 & earlier intake & matching ex crossover heads, I'd prob go with a '77-80 800 cfm Pontiac Qjet to rework Am not a big fan of the early integral choke 750 cfm Qjets like the 7043262, 7043262, the latter being what came on your '74. They can be gone through & reworked though.
Oh interesting...50 years of hijinx gets me to this point I guess 😞

I'm not sure what intake I have but it's a 74 SR block with an iron stock one.

I've never had a working choke on any pontiac so that would be a huge upgrade.

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'74 T/A 455 Y-code SD clone

previously on Dawson's Creek:

'74 T/A 400
'81 AMC SX/4
'69 FB 350
  #6  
Old 06-19-2024, 04:15 PM
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So in your opinion would the '75 & up carb chimney fit in that hole that is plugged and other than re-routing the lines I should be good in regards to the base?

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'74 T/A 455 Y-code SD clone

previously on Dawson's Creek:

'74 T/A 400
'81 AMC SX/4
'69 FB 350
  #7  
Old 06-19-2024, 07:06 PM
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65 Lamnas 65 Lamnas is offline
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Pictured are the 2 different styles of "chimney vents". The 71-74 style is cast into a removable cover. Through '72 they have a divorced choke and the 73-74 have an integral hot air choke. The later 75-79 style of "chimney vent" is integrated into the airhorn. There is a 2nd style of 800cfm Pontiac Q-jet that has no "chimney vent". It was mostly used on the 301 engine and is an 800cfm carb. I prefer to use these cores for HP builds due to the lack of the vent.
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  #8  
Old 06-20-2024, 03:36 PM
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unruhjonny unruhjonny is offline
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I might have one of those 301 carbs too!

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1970 Formula 400
Carousel Red paint on Black standard interior
A no-engine, no-transmission, no-wheel option car.
Quite likely one of few '70 Muncie three speed Formula 400's left.


1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing)
2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs)
  #9  
Old 06-21-2024, 11:34 AM
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I think I found a '75 carb one town over...pick it up on tuesday

Then I guess it'll be an OJ situation with the base:



Interesting how many different q-jets and chim-chim-chimineys there are...I had no idea...always learning

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'74 T/A 455 Y-code SD clone

previously on Dawson's Creek:

'74 T/A 400
'81 AMC SX/4
'69 FB 350
  #10  
Old 06-28-2024, 10:16 AM
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Skidmark Skidmark is offline
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Quote:
Originally Posted by kingbuzzo View Post
I think I found a '75 carb one town over...pick it up on tuesday

Then I guess it'll be an OJ situation with the base:



Interesting how many different q-jets and chim-chim-chimineys there are...I had no idea...always learning
I have a 75 TA and was told that the 75 q jet is a kinda odd ball unit. Cliff doesn't recommend using one if you have access to a 76 and up carb.

I've got the stick version xxx263 getting a 76 stick carb built now. Hoping it will fit my base without modifications.

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  #11  
Old 06-28-2024, 12:28 PM
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great...I have two of them in stock now lol

I'll find out soon enough

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'74 T/A 455 Y-code SD clone

previously on Dawson's Creek:

'74 T/A 400
'81 AMC SX/4
'69 FB 350
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