Rochester vs Carter Quadrajet on POP

[Cliff K.]

I recently looked at a 1968 327/300 that has a correctly dated Carter Quadrajet carburetor. However, the owner protect-o-plate has the "R" designation for a Rochester carb. We know that Carter made the Quadrajet for several years because GM, for whatever reason, wanted additional capacity to supply the Quadrajet.

Question is; should the POP show a designation of "C" if the original carb was a Carter built Quadrajet or would it continue to show the "R" since the Carter was additional production (even used the same number system as the Rochester) for the Rochester Quadrajet? Does the "R" designation indicate a Quadrajet carb regardless if made by Rochester or Carter?

Appreciate your sharing of experience on this subject.

Cliff Kennedy

[Terry M.]

Re: Rochester vs Carter Quadrajet on POP

The "R" designation indicates a Quadrajet carb regardless if made by Rochester or Carter.

[Jim T.]

Re: Rochester vs Carter Quadrajet on POP

My 68's POP also shows R. Don't remember if the original carb was a Carter or Rochester, it was replaced by the 68's warranty. The replacement was removed in 1974 and I installed a Holley 650 spreadbore 6210 double pumper that remains in use.

[Cliff K.]

Re: Rochester vs Carter Quadrajet on POP

Terry,

Thank you

[Joe L.]

Re: Rochester vs Carter Quadrajet on POP

My 68's POP also shows R. Don't remember if the original carb was a Carter or Rochester, it was replaced by the 68's warranty. The replacement was removed in 1974 and I installed a Holley 650 spreadbore 6210 double pumper that remains in use.

Jim------


Carter was not manufacturing Q-Jets as early as 1968, so all original 1968 Q-Jets will be manufactured by Rochester, Carter "got into the act" about 1970.

[Pat M.]

Re: Rochester vs Carter Quadrajet on POP

Question is; should the POP show a designation of "C" if the original carb was a Carter built Quadrajet or would it continue to show the "R" since the Carter was additional production (even used the same number system as the Rochester) for the Rochester Quadrajet?

My 70 has what I believe to be the original Carter carb and the POP shows a "C".

[Patrick H.]

Re: Rochester vs Carter Quadrajet on POP

My 70 has what I believe to be the original Carter carb and the POP shows a "C".

Picture of the POP?
I'd be interested in seeing that, even if you block the end of the VIN.

Patrick

[Pat M.]

Re: Rochester vs Carter Quadrajet on POP

Picture of the POP?
I'd be interested in seeing that, even if you block the end of the VIN.

Patrick

Sure, here you go:

[Jason R.]

Re: Rochester vs Carter Quadrajet on POP

My 70 has a "C" on the POP also. The carb is a Carter.

[Patrick H.]

Re: Rochester vs Carter Quadrajet on POP

Thanks.

Any other examples of C for Carter, or R on a car with a Carter-built Rochester?

Patrick

[Jim T.]

Re: Rochester vs Carter Quadrajet on POP

My 70's original carb is a Carter manufactured Quadrajet #704202 FO DH and has the C on the POP.

[Terry M.]

Re: Rochester vs Carter Quadrajet on POP

I learned something new here.

[Jack H.]

Re: Rochester vs Carter Quadrajet on POP

I'm looking at the '71 AIM, Section 0, Sheet B3. It defines the field codes used for POP emboss. The selection choices for the Carb Source field (holarith position C-11) are:

B Bay City
C Carter
H Holley
R Rochester

To confirm this is true for other years, consult the applicable AIM...

[Patrick H.]

Re: Rochester vs Carter Quadrajet on POP

I'm looking at the '71 AIM, Section 0, Sheet B3. It defines the field codes used for POP emboss. The selection choices for the Carb Source field (holarith position C-11) are:

B Bay City
C Carter
H Holley
R Rochester

To confirm this is true for other years, consult the applicable AIM...

I'm just surprised that anyone in the plant would have taken the time to check the carb to see where it was made. I suspect that there must have been something on the paperwork indicating this, but even that surprises me. Had these been actual Carter brand (as opposed to subcontracted) that would be different.

Patrick