[65 Lamnas]

Can anyone explain WHY there would be a plant code (or pick code) on a SR Quadrajet?

It’s my understanding that the plant code is there to assist the assembly line workers in choosing the correct carb for an engine, so as to minimize mistakes.

I’ve not seen this before on anything but Chevrolet Qjets. Both times were on ‘69 Chevy carbs (70292XX) and one had a 2110 date code with an ED plant code and the other a 0611 date code and a DH.

[johnta1]

Don't know unless it was left overs from Rochester and they put them in inventory?

Wonder if that is the correct pick code for that carb number?

[srmmmm]

Originally Posted by johnta1

Don't know unless it was left overs from Rochester and they put them in inventory?

Wonder if that is the correct pick code for that carb number?

Components such as carburetors and EGR valves (items related to emission standards), leftover at the end of the model year at the assembly plant were typically sent to the parts division warehouses. We also sent parts directly to dealers for warranty replacements if there were no service parts available. This often occurred early in the model year when all of the supplier plant's production was going direct to the assembly plants. I can recall doing bills of lading for radiators, starters, carburetors, and even sheet metal parts sometimes that were going to dealers for warranty. So, it's very possible that an assembly plant coded carburetor could have gone through a parts warehouse or dealer parts department.

[poncho-mike]

Along a similar line of questions, can somebody help me understand how the Carter produced quadrajets fit into the grand scheme of carbs.

I have a pair of 7041262s (1971 455 D-port). One is a conventional Rochester built Q-jet with pick code and production date. The other doesn't have a standard format production date. It has a 2 digit code stamped into it, and the body is manufactured by Carter. Were the Carter carbs used in production, were they for service only, or were they built by and supplied to the after-market by non-GM entities?

[65 Lamnas]

Originally Posted by poncho-mike

Along a similar line of questions, can somebody help me understand how the Carter produced quadrajets fit into the grand scheme of carbs.

I have a pair of 7041262s (1971 455 D-port). One is a conventional Rochester built Q-jet with pick code and production date. The other doesn't have a standard format production date. It has a 2 digit code stamped into it, and the body is manufactured by Carter. Were the Carter carbs used in production, were they for service only, or were they built by and supplied to the after-market by non-GM entities?

Rochester manufacturing couldn’t keep up with demand once all the GM divisions started providing engines with QJets.

Rochester contracted with Carter to manufacture CERTAIN Chevy and Pontiac QJets to help meet production demand.

When Rochester moved from the carb ID “round tags”, they started using a four digit Julian date code. Prior to that they used a letter and numbering system to identify date of manufacture. Carter-manufactured Quadrajets retained the old date code system and never changed.

Carter only manufactured Quadrajets for the Chevy and Pontiac “garden variety“ engines. They did not ever manufacture any quadrajets for the Chevy high performance or Pontiac Ram Air engines. Carter also never manufactured Quadra jet service replacement carbs for AC Delco.

Carter also supplied new and reman carbs to the aftermarket. They were identified by numbers like 4850S, 6574S, etc., These carbs did NOT use the standard Rochester numbering/ID system.

Carter Qjets are sub-standard to Rochester regarding casting quality.

[TXSTARFIRE]

Chev and Pontiac only, never for Buick, Olds or Cadillac?

[srmmmm]

Originally Posted by TXSTARFIRE

Chev and Pontiac only, never for Buick, Olds or Cadillac?

When I worked at Lordstown in the late seventies, we were producing the Chevy Monza, Pontiac Sunfire, Buick Skylark, and Oldsmobile Starfire. Each division had different specification standards on major components that had to be met if part substitutions had to be made due to shortages. For example, each division had a 63 amp alternator available on their cars. The Buick and Oldsmobile alternators had to produce a minimum of 63 amps at a certain rpm so those part numbers could be substituted for each other. Pontiac had a slightly lower minimum output of perhaps 60 amps at the same rpm, and Chevy even lower at 57 amps. So Chevy alternators could not be used on Pontiacs, Buicks or Oldsmobiles as a substitute. And Pontiacs could not be used on Buicks and Oldsmobiles. But an alternator designated got Buick or Olds could be used on a Pontiac or Chevy and Pontiac units could also be used on Chevys. It was all about tolerances. That was one reason the cost escalated on parts like that too as you went up through the divisions.

There were similar requirements on starters, power steering pumps and A/C compressors.

[carbking]

Carter produced O.E. Q-Jets for Chevrolet and Pontiac ONLY; Pontiac through 1976, Chevrolet through 1980.

Carter produced AM Q-Jets for all five of the GM divisions.

As far as the Carter castings are inferior due to inferior metal, I personally feel this is incorrect. No, I haven't seen as many Q-Jets as Cliff and maybe some others, BUT I HAVE SEEN THOUSANDS OF Q-JETS ! I started building Q-Jets in about 1971.
What I believe is the cause of this rumor is the fact that the percentage of Carter-produced Q-Jets was much higher in the 1960's than in the 1970'.s. The first fuel inlet nut was only three threads. Changing the fuel filter about twice and the fuel inlet was stripped. Rochester changed to a 5 thread nut about 1967. Better, but still an issue. About 1970ish Rochester changed to an 8 thread nut and that seemed to solve the issue.

Over the years, I probably did 500 or so 1967 GTO Q-Jets. The ratio of Carter to Rochester was about 5 to 1. Virtually ALL of BOTH required a heli-coil for the fuel inlet.

Not trying to start an argument, simply posting my opinion based on LOTS of experience.

As far as picking codes on SR carbs; I have seen quite a few of these, BUT ONLY ON THE 1968 AND 1969 VERSIONS, other than restamps.

Remember that Rochester did the change-over from round tag to stamping the casting over a two year period, not all at once.

Jon

[Kenth]

Jon, i have only seen 4-digit AM Carter mfd 4MV´s for Chevrolet and Pontiac, noone for Buick, Cadillac or Oldsmobile?

As for castings, what i´ve seen since the 80's is that Carter castings are porous/softer than Rochester castings, almost to the point of being disposable.

Kenth

[carbking]

Kenth - as I stated, NO interest in starting an argument, simply what I have observed.

As far as the Carter Q-Jets, lets see what happens below:

Carter Q-Jets
Make Year CFM Model Carb make Prefix Carb number Code Kit Type Chapter Carburetor suffix Cylinders CID Replacement carburetor Replacement adapter Superceding carburetor
Buick 1967 (Replacement) A/T Carter 4645 QJET 7 8 430
Buick 1968 (Repl) A/T Carter 4764 QJET 10 8 430
Buick 1969 (Repl) A/T Carter 4764 QJET 10 8 430
Buick 1967 (Replacement)(cancelled) Carter 6204 QJET 10 8
Buick 1977 A/T repl 17057213 Carter 9163 QJET 7 8 350
Cadillac 1967 Repl 7037230 Carter 4459 QJET 7 8 429 6126
Cadillac 1967 Repl 7027234 Carter 4460 QJET 7 8 429 6126
Cadillac 1967 Repl 7037230 Carter 4461 QJET 7 8 429 6126
Cadillac 1968 Carter 4696 QJET 7 8 6126
Cadillac 1968 Eldorado Carter 4697 QJET 7 8 4696
Cadillac 1967 (Replacement) Carter 6126 QJET 7 8
Cadillac 1968 (Replacement) Carter 6126 QJET 7 8
Cadillac 1969 (Replacement) Carter 6298 QJET 7 8 472
Chevrolet 1965 Repl 7027200 Carter 4445 QJET 7 8 396 6170
Chevrolet 1966 Repl 7027200 Carter 4445 QJET 7 8 396 6170
Chevrolet 1967 Repl 7027200 Carter 4445 QJET 7 8 396 6170
Chevrolet 1967 Repl 7027201 S/T Carter 4446 QJET 7 8 396 6170
Chevrolet 1965 Repl 7027201 S/T Carter 4446 QJET 7 8 396 6170
Chevrolet 1967 Repl 7027202 A/T Carter 4447 QJET 7 8 327 6173
Chevrolet 1966 Repl 7027202 A/T Carter 4447 QJET 7 8 327 6173
Chevrolet 1966 Repl 7027203 S/T Carter 4448 QJET 7 8 327 6173
Chevrolet 1967 Repl 7027203 S/T Carter 4448 QJET 7 8 327 6173
Chevrolet 1966 Repl 7037210 (Calif) A/T Carter 4449 QJET 7 8 396 6170
Chevrolet 1967 Repl 7037210 (Calif) A/T Carter 4449 QJET 7 8 396 6170
Chevrolet 1967 Repl 7037211 (Calif) S/T Carter 4450 QJET 7 8 396 6170
Chevrolet 1966 Repl 7037211 (Calif) S/T Carter 4450 QJET 7 8 396 6170
Chevrolet 1966 Repl 7037212 (Calif) A/T Carter 4451 QJET 7 8 327 6173
Chevrolet 1967 Repl 7037212 (Calif) A/T Carter 4451 QJET 7 8 327 6173
Chevrolet 1966 Repl 7037213 (Calif) S/T Carter 4452 QJET 7 8 327 6173
Chevrolet 1967 Repl 7037213 (Calif) S/T Carter 4452 QJET 7 8 327 6173
Chevrolet 1968 (Repl 7028210) A/T Carter 4671 QJET 7 8 396 4848
Chevrolet 1968 (Repl 7028210) A/T Carter 4671 QJET 7 8 427 4848
Chevrolet 1968 Repl 7028211 S/T Carter 4672 QJET 7 8 427 4849
Chevrolet 1968 Repl 7028211 S/T Carter 4672 QJET 7 8 396 4849
Chevrolet 1968 Repl 7028212 A/T Carter 4673 QJET 7 8 327 4850
Chevrolet 1968 Repl 7028212 A/T Carter 4673 QJET 7 8 350 4850
Chevrolet 1968 Repl 7028213 S/T Carter 4674 QJET 7 8 327 4851
Chevrolet 1968 Repl 7028213 S/T Carter 4674 QJET 7 8 350 4851
Chevrolet 1969 (Repl 7029200) A/T Carter 4848 QJET 7 8 427
Chevrolet 1968 (Repl 7029200) A/T Carter 4848 QJET 7 8 396
Chevrolet 1969 (Repl 7029200) A/T Carter 4848 QJET 7 8 396
Chevrolet 1968 (Repl 7029200) A/T Carter 4848 QJET 7 8 427
Chevrolet 1968 (Repl 7029201) S/T Carter 4849 QJET 7 8 427
Chevrolet 1968 (Repl 7029201) S/T Carter 4849 QJET 7 8 396
Chevrolet 1969 (Repl 7029201) S/T Carter 4849 QJET 7 8 427
Chevrolet 1969 (Repl 7029201) S/T Carter 4849 QJET 7 8 396
Chevrolet 1968 (Repl 7029202) A/T Carter 4850 QJET 7 8 350
Chevrolet 1969 (Repl 7029202) A/T Carter 4850 QJET 7 8 350
Chevrolet 1968 (Repl 7029202) A/T Carter 4850 QJET 7 8 327
Chevrolet 1969 (Repl 7029202) A/T Carter 4850 QJET 7 8 327
Chevrolet 1968 (Repl 7029203) S/T Carter 4851 QJET 7 8 327 4850
Chevrolet 1969 (Repl 7029203) S/T Carter 4851 QJET 7 8 350 4850
Chevrolet 1969 (Repl 7029203) S/T Carter 4851 QJET 7 8 327 4850
Chevrolet 1968 (Repl 7029203) S/T Carter 4851 QJET 7 8 350 4850
Chevrolet 1970 (Repl 7040200) A/T Carter 4984 QJET 7 8 454
Chevrolet 1970 (Repl 7040200) A/T Carter 4984 QJET 7 8 400
Chevrolet 1970 (Repl 7040200) A/T Carter 4984 QJET 7 8 396
Chevrolet 1970 (Repl 7040202) A/T Carter 4985 QJET 7 8 350
Chevrolet 1970 (Repl 7040203) S/T Carter 4986 QJET 7 8 350
Chevrolet 1967 (Replacement) Carter 6170 QJET 7 8 396
Chevrolet 1965 (Replacement) Carter 6170 QJET 7 8 396
Chevrolet 1965 (Replacement) Carter 6170 QJET 7 8 427
Chevrolet 1966 (Replacement) Carter 6170 QJET 7 8 427
Chevrolet 1967 (Replacement) Carter 6170 QJET 7 8 427
Chevrolet 1966 (Replacement) Carter 6170 QJET 7 8 396
Chevrolet 1966 (Replacement) Carter 6173 QJET 7 8 327
Chevrolet 1967 (Replacement) Carter 6173 QJET 7 8 327
Chevrolet 1967 (Replacement) Carter 6173 QJET 7 8 350
Chevrolet 1966 (Replacement) Carter 6173 QJET 7 8 350
Chevrolet 1971 (Repl 7041200) A/T Carter 6206 QJET 7 8 454
Chevrolet 1971 (Repl 7041200) A/T Carter 6206 QJET 7 8 400
Chevrolet 1971 (Repl 7041202) A/T Carter 6207 QJET 7 8 350
Chevrolet 1971 (Repl 7041203) S/T Carter 6208 QJET 7 8 350
Chevrolet 1972 (Replacement) Carter 6372 QJET 7 8 402
Chevrolet 1972 (Replacement) Carter 6372 QJET 7 8 454
Chevrolet 1972 (Replacement) Carter 6373 QJET 7 8 350
Chevrolet 1973 (Repl 7043200) Carter 6571 QJET 7 8 454
Chevrolet 1973 (Repl 7043202) A/T Carter 6572 QJET 7 8 350
Chevrolet 1974 Truck A/T 7044202 Carter 9037 QJET 7 8 350
Chevrolet 1974 A/T (Repl 7044206 Carter 9038 QJET 7 8 350
Chevrolet 1974 Truck A/T 7044213 Carter 9039 QJET 7 8 350
Chevrolet 1974 Truck A/T 7044223 Carter 9040 QJET 7 8 454
Chevrolet 1974 Stn Wgn A/T 7044226 Carter 9041 QJET 7 8 400
Chevrolet 1975 Truck Repl 7045212 Carter 9082 QJET 7 8 454
Chevrolet 1975 Truck Repl 7045213 Carter 9083 QJET 7 8 350
Chevrolet 1976 Truck Repl 7045213 Carter 9083 QJET 7 8 350
Chevrolet 1976 Truck Repl 7045229 Carter 9084 QJET 7 8 400
Chevrolet 1975 Truck Repl 7045229 Carter 9084 QJET 7 8 400
Chevrolet 1975 A/T Repl 7045200 Carter 9086 QJET 7 8 454
Chevrolet 1976 A/T Repl 7045202 Carter 9087 QJET 7 8 350
Chevrolet 1976 A/T Repl 7045202 Carter 9087 QJET 7 8 400
Chevrolet 1975 A/T Repl 7045202 Carter 9087 QJET 7 8 350
Chevrolet 1975 A/T Repl 7045202 Carter 9087 QJET 7 8 400
Chevrolet 1975 (repl 7045228) Carter 9088 QJET 7 8 350
Chevrolet 1977 Truck repl 17057213 Carter 9163 QJET 7 8 350
Chevrolet 1977 A/T repl 17057213 Carter 9163 QJET 7 8 350
Chevrolet 1978 Repl 17058204 Carter 9257 QJET 7 8 350
Chevrolet 1978 Truck (repl 17058213) Carter 9258 QJET 7 8 350
Chevrolet 1979 Truck (repl 17059205) Carter 9301 QJET 7 8
Chevrolet 1979 Truck (repl 17059206) Carter 9302 QJET 7 8
Chevrolet 1979 Truck (repl 17059216) Carter 9303 QJET 7 8
Chevrolet 1980 (repl 17080205/6) Carter 9360 QJET 7 8
Chevrolet 1980 (repl 17080213) Carter 9361 QJET 7 8
Chevrolet 1980 (repl 17080290/2) Carter 9362 QJET 7 8
Chevrolet 1980 (repl 17080298) Carter 9363 QJET 7 8
G.M.C. 1967 (cancelled) Carter 6204 QJET 10 8
G.M.C. 1967 (cancelled) Carter 6205 QJET 10
G.M.C. 1974 Truck A/T 7044213 Carter 9039 QJET 7 8 350
G.M.C. 1975 Truck Repl 7045212 Carter 9082 QJET 7 8 454
G.M.C. 1976 Truck Repl 7045213 Carter 9083 QJET 7 8 350
G.M.C. 1975 Truck Repl 7045213 Carter 9083 QJET 7 8 350
G.M.C. 1976 Truck Repl 7045229 Carter 9084 QJET 7 8 400
G.M.C. 1975 Truck Repl 7045229 Carter 9084 QJET 7 8 400
Oldsmobile 1967 (Replacement) Carter 4644 QJET 7 8 425
Oldsmobile 1967 (Replacement) Carter 4644 QJET 7 8 400
Oldsmobile 1966 (Replacement) Carter 4644 QJET 7 8 400
Oldsmobile 1966 (Replacement) Carter 4644 QJET 7 8 425
Oldsmobile 1968 (Replacement) Carter 4954 QJET 7 8 400
Oldsmobile 1969 (Replacement) Carter 4954 QJET 7 8 400
Oldsmobile 1968 (Replacement) Carter 4954 QJET 7 8 455
Oldsmobile 1968 (Replacement) Carter 4954 QJET 7 8 350
Oldsmobile 1969 (Replacement) Carter 4954 QJET 7 8 455
Oldsmobile 1969 (Replacement) Carter 4954 QJET 7 8 350
Oldsmobile 1966 (Replacement)(cancelled) Carter 6205 QJET 10 8
Oldsmobile 1967 (Replacement)(cancelled) Carter 6205 QJET 10 8
Pontiac 1967 (Replacement) A/T Carter 4455 1367 QJET 7 8 400 6132
Pontiac 1967 (Replacement) A/T Carter 4455 1367 QJET 7 8 428 6132
Pontiac 1967 Repl 7027263 S/T Carter 4456 1363 QJET 7 8 428 6132
Pontiac 1967 Repl 7027263 S/T Carter 4456 1363 QJET 7 8 400 6132
Pontiac 1967 Repl 7037262 (Calif) A/T Carter 4457 1367 QJET 7 8 400 6132
Pontiac 1967 Repl 7037262 (Calif) A/T Carter 4457 1367 QJET 7 8 428 6132
Pontiac 1967 Repl 7037263 (Calif) S/T Carter 4458 1363 QJET 7 8 400 6132
Pontiac 1967 Repl 7037263 (Calif) S/T Carter 4458 1363 QJET 7 8 428 6132
Pontiac 1968 Repl 7028262 A/T Carter 4675 1378 QJET 7 8 400
Pontiac 1969 (Repl 7029262) A/T Carter 4852 1381 QJET 7 8 400
Pontiac 1969 (Repl 7029263) S/T Carter 4853 1380 QJET 7 8 400
Pontiac 1969 (Repl 7029268) A/T Carter 4887 1380 QJET 7 8 428
Pontiac 1969 (Repl 7029268) A/T Carter 4887 1380 QJET 7 8 400
Pontiac 1970 Replacement All trans. Carter 4987 1387 QJET 7 8 400
Pontiac 1970 Replacement All trans. Carter 4987 1390 QJET 7 8 455
Pontiac 1970 Replacement A/T Carter 4988 1387 QJET 7 8 400
Pontiac 1967 (Replacement) Carter 6132 1367 QJET 7 8 400
Pontiac 1967 (Replacement) Carter 6132 1367 QJET 7 8 428
Pontiac 1967 (Replacement)(cancelled) Carter 6157 QJET 10 8
Pontiac 1971 (Repl 7041262) S/T Carter 6209 1400 QJET 7 8 455
Pontiac 1971 (Repl 7041264) S/T Carter 6210 1405 QJET 7 8 400
Pontiac 1968 (replacement)(cancelled) Carter 6231 QJET 10 8
Pontiac 1972 (Repl 7042272) A/T Carter 6374 1413 QJET 7 8 455
Pontiac 1972 (Repl 7042274) A/T Carter 6375 1414 QJET 7 8 400
Pontiac 1973 (Repl 7043262) A/T Carter 6573 1419 QJET 7 8 455
Pontiac 1973 (Repl 7043264) Carter 6574 1417 QJET 7 8 400
Pontiac 1973 (Repl 7043266) A/T Carter 6617 1424 QJET 7 8 400
Pontiac 1974 A/T (Repl 7044262) Carter 9042 1419 QJET 7 8 455
Pontiac 1974 A/T (Repl 7044266) Carter 9043 1424 QJET 7 8 400
Pontiac 1975 A/T Carter 9089 QJET 7 8 400
Pontiac 1975 A/T Carter 9089 QJET 7 8 455
Pontiac 1975 (repl 7045264) Carter 9090 QJET 7 8 400
Pontiac 1975 (repl 7045264) Carter 9090 QJET 7 8 455

Jon

[carbking]

I haven't figured out posting tables on this forum; if you will message me with an email address, I will try to send you a file. Would you prefer Excel, Word, or Access?
Note there are 4 digit Cqrter Q-Jets for Buick, Cadillac, Chevrolet, GMC, Oldsmobile, and Pontiac.

This list taken from original Carter files.

Jon

[Kenth]

Thanks Jon, message sent.

And, just because i haven´t seen those Buick, Cadillac or Oldsmobile units doesn't mean they don´t exist, hope some of them will show up someday.

Kenth

[carbking]

Kenth - message did not come through. Send me an email at [email protected]

I don't remember ever having a Cadillac version; but have had a few Buick, and maybe a couple of Oldsmobile.

The Pontiacs seem to be the most common; have had more than a hundred of the Pontiacs. But at one time, I had more than 10,000 Pontiac Q-Jets. I bought more of them than the others.

Jon

[carbking]

Kenth - did you get my email?

Jon

[Kenth]

Jon, thanks for the list!
I've skimmed through it and found that many of the numbers are not found in Standard Motors, TOMCO or Walker catalogs.
I'll go through Delco Parts&Service #9 as well and see what I can find there. I'm guessing the missing numbers never made it into production?

Kenth

[carbking]

Some of the Carter A/M carburetors used unique parts. I am not surprised that Standard, Walker, etc. do not list them.

There are quite a few O.E. low production carbs over the years that do not make most, if any, of the aftermarket suppliers. Just for Pontiac, look for the 1956 / 1957 dual quads, and all of the SD carbs from 1961, 1962, and 1963.

I think the list contains a reference if the number was issued, but not produced.

Jon