67 Qjets
 

I "think" I know the answer to this, but wanna check with you guys....

1st question:

On the non RA '67 400 and 428 Qjets, 7027262, 7027263 and their CA counterparts, is there any way to tell from the documentation (Protecto Plate, build sheet) if the engine was supplied with a Carter or a Rochester??

My initial thought is "no", because the same pick code was used for all the auto carbs, and a different code for the stick cars, and there was no further way rto differentiate.

2nd question:

Did these same 1967 carbs all come with the airhorn-style idle bypass air feature? There was a little screw under the triangle-shape spring steel piece on the bowl stack vent.

The engine code would determine the carb.
What is the engine code?


:confused:

John, I think you might be confused. My question is regarding 1967 Quadrajets. Carter made Quadrajets, and Rochester made them too.

With that in mind, is there any way to tell by documentation or otherwise, WHICH QJet the assembly line put on the engine? NOT the carb number, but the manufacturer? My thought was it could be either, and there's no way to tell for certain which it was if the original carb is MIA.

It's an XS engine, but I'm not sure that helps.

YEP, confused!
:D

I thought you wanted to know if it had a Qjet or the AFB (or whatever the other carb was)

:)

XS is Ram Air, so it'd definitely be a Rochester. :confused:

I was mistaken. It’s a WS, not an XS. Car is a 360HP HO car with 068 cam and MT.

I don’t think there’s a way to tell from documentation if the engine had a Carter on it or a Rochester.

Yeah, I *believe* it could have gone either way with the HO. But
the odds strongly favor the Rochester. And when you consider
the Carter-made units are less desirable castings...

My 7027262 (HO/auto) never had that bypass, it's bowl vent isn't
slant cut either. Also checked three other early carbs (68 Buick,
and 68 Olds) and none of those have the bypass either - both of
my 7029268 carbs do though. HTH.

The conical head screw under the triangular cover adjusts/adds air to the upper idle airbleeds on 1967 (1967 only units with #´s starting 703xxxx)-69 units.
On 1970 and later units the same screw adjusts/adds air to the upper main circuit air bleeds.
Rochester named the feature "off-idle" adjustment.

The date would be the only consideration clue about originality.
I've never seen a 67 Carter Qjet carb on PMD or Baltimore 67 cars that generally populated my area.

Carter stamped a month/year date code

My '67 was built in Pontiac in June 1967, 335 HP automatic with air, came with a Rochester Q-Jet 7027262. It does not have an idle air adjustment at the bowl vent.