[3goats]

I came across a carter quadrajet that I need info for. Problem is the carb is a restamp.
Would anybody here know what application this carb would of came from.

Throttle body #7037174
Bowl #7037576
Airhorn # 7037454
Jets 73
p rods 47
s rods bp

It has pontiac linkage and divorced choke. I'm going to use it for my project until I can find a better carb. I've heard that carter never made high performance carbs. Is this true? With these casting numbers it matches a 7029273 carb but I know it isn't a 273. But what would a carter like this be. A SR carb?
As I said it is restamped.
Thanks for replies.

[Kenth]

What is the stamped number at this location:

[3goats]

Kenth
Stamped number is 7029273 xb 2109. Obviously restamp as i've heard carter never made high performance carbs. Am I right?
There is a cast #3 under fuel inlet on bowl and a stamped number on TB between plates that looks like 37489?

[Kenth]

You´re correct, Carter never made RamAir units.

#37489 between plates indicates an aftermarket Carter Q-jet replacement unit.

It, may have started it´s life as a Carter 4987S or 4988S.

I have a NOS 4887S with cast "3" beneith fuel inlet and #37478 stamped between plates.

These units also have the early (1969-70) POE-system, two holes in the back wall of choke housing, under choke blade, serving dual purpose as choke enrichment/high speed enrichment and secondary main well airbleeds.

RA units do not have the POE system.

[3goats]

Thanks Kenth
I rechecked the number between plates and it is 37479 not 37489 as I wrote before.
Also underneath the bowl where it has cast #3 it has 37790 stamped.
I found another number on passenger side rear of airhorn 37498.
When you mention holes in back of air housing I see no holes? The airhorn has the tubes coming up on secondary side not the covered or enclosed type or POE if i'm understanding you correctly.
The throttle body has two vertical slots in each primary and a extra horizontal slot on one side only. Don't know it's function. Are these called the off idle slots?
I was thinking of rebuilding this carb for a driver and install a ram air 3 rebuild kit with proper jets etc. Would this carb be ok or is there anything that might not work for me?

[Kenth]

1967-68 Pontiac Q-jets (Rochester or Carter) did not use the POE-system, but they uses a larger float assembly with less leverage on inlet needle than used in 1969 and later units.

The vertical slots in primary bores are the off-idle slots, the horizontal slot is used for controlling the ignition vacuum advance, if it´s located above throttle blade with .040" of the off-idle slots shown it´s a "ported" source used on 1968 and later units.
If the slot is located under the throttle blade (on 1967 Carter aftermarket replacement units) it is a manifold vacuum source, wich is correct for 1967.
Original 1967 units did not use the horizontal slot in bore, they uses a source from beneith throttle plate.

I think your unit will be fine properly adjusted.

Red = 1969-70 POE, Yellow = "Regular" :

[3goats]

Thanks Kenth
I'll checked the location of the horizontal slot and it looks to be above blade.when closed. Looks to be in the center of vertical slot if you know what I mean. So is this a 68 unit?
The airhorn in your yellow marked picture is what I have.
Thanks for your time Kenth.

[milly]

I've got a late 60's Cater built Q-jet for GMC on my T/A. I haven't bothered to find the numbers on it yet. I was told that it came off a '68 or '69 GMC pick up. I'll have to check the air horn to compare to the pics that were posted.