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CRG Research Report

First Generation Camaro Carburetors

© 2006-2014, Camaro Research Group

Author - and the CRG
Reviewed by the CRG
Last Edit: 25-Oct-2013
Previous Edits: 17-Nov-2008, 12-Mar-2008, 19-Dec-2007
Original Release: 30-Nov-2007

Index

Introduction and History

Three companies supplied carburetors for 1967 through 1969 Camaro usage: Rochester Products, Carter, and Holley.

Rochester Products plant, circa 1953
Rochester, New York plant
National Cycle Manufacturing Company, Bay City, MI, circa 1898
National Cycle Manufacturing Company
Most first-generation Camaro carburetors were supplied by the Rochester Products Division of General Motors. Rochester Products Division has been operating since production began at the then-new Lexington Avenue plant in Rochester, New York in 1939. Originally a division of Delco Appliance, Rochester Products Division manufactured tubing, automotive locks and keys, carburetors and a host of other automotive components. Eventually, these other products were dropped, and Rochester began to specialize in carburetors, fuel injection systems, and emission control products. The Rochester Products Division is now known as the Fuel Systems Division of General Motors.

In addition to production from the Rochester, New York plant, one- and two-barrel carburetors were supplied for the Camaro by the Bay City, Michigan plant. Starting out as the National Cycle Manufacturing Company in 1892, the Bay City plant began producing trucks in the early 1900's. In 1916 William Durant purchased the failing business and converted it to a Chevrolet automobile parts manufacturing facility. In the 1960's it employed around 5,000 people and still lives on today producing engine components (camshafts, Northstar engine parts, etc.) for the General Motors Powertrain Division.


Carter Carburetor plant, circa 1915
Carter Carburetor plant
William "Will" Carter, circa 1950
William "Will" Carter
Carter Carburetor also supplied carburetors for the Camaro. The Carter Carburetor Company of St. Louis, Missouri was started by William (Will) Carter in 1909. Carter had found that the carburetor was a particular source of problems for automobile companies and motorists alike. This prompted him to develop methods of improving fuel delivery, beginning with wooden models that would then become cores for sand molds and eventually, a cast-brass carburetor. Carter carburetors were acknowledged for their superior accuracy in processing and metering fuel. In 1952, the "Will Carter Four Barrel" (WCFB) became the world's first four-barrel carburetor and had a whopping rating of 385 CFM! Carter was purchased in 1922 by the American Car and Foundry Company (ACF) and continues to this day manufacturing the Carter Thermoquad carb.



Holley Carburetor, part of the Bovaird and Seyfang Building, circa 1895
Holley Carburetor
George Holley, circa 1901
George Holley
The third supplier for carburetors to the first-generation Camaro was Holley. The Holley carburetor was the high performance carburetor of choice for many automotive manufacturers, not just General Motors. Although founded in 1896 by brothers George and Earl Holley, Holley didn't enter the automotive aftermarket until 1948. Supplying carburetors, repair kits and genuine Holley parts to garages, service stations and speed shops around the country, Holley began to make a name in the hot rod circles as a reliable, easy-to-adjust, easy-to-rebuild, easy-to-modify carburetor. In 1952, a new 250,000-square-foot manufacturing plant was opened in Bowling Green, Kentucky, and product development continued with the first Holley modular carburetor, the model 4150 that was made standard on the 1957 Ford Thunderbird. Chevrolet OEM use of the Holley Carburetor was generally limited to use on special high performance engines. The 4150 carb continues to be manufactured today, with literally millions having been sold over the years.  

Rochester Carburetors

Rochester supplied four basic carburetors for the Camaro:


Rochester 1BV
Monojet Carburetor
Rochester 1MV
Monojet Carburetor
Rochester 2GV
Dualjet Carburetor
Rochester 4MV
Quadrajet Carburetor
Rochester 1BV Monojet Carburetor Rochester 1MV Monojet Carburetor Rochester 2GV Dualjet Carburetor Rochester 4MV Quadrajet Carburetor
 

Carter Carburetors

The Carter "YF" single barrel carburetor was used only in 1967, and only on the six-cylinder engines with A.I.R. (Air Injection Reactor, aka "Smog"). Other than this application, no other "Carter designed" carburetors (AFB, AVS, WCFB or Thermoquad) were ever installed from the factory on a first-generation Camaro. However, Carter was also licensed to build the Quadrajet as a secondary source, and supplied carburetors to not only Chevrolet, but other GM divisions as well. Note that all Carter-built Quadrajet carburetors will have the same part number and ID number as the Rochester-built Quadrajets, but will have "MFG BY CARTER CARBURETOR FOR GMC" cast into the carburetor body.

Carter YF
1-barrel Carburetor
"MFG BY CARTER" location "MFG BY CARTER" casting
Carter YF 1-barrel Carburetor "MFG BY CARTER" location "MFG BY CARTER" casting
 

Holley Carburetors

Holley supplied one carburetor model for the Camaro: the tried and true 4150 series. It was standard on the special high performance (solid lifter) 302/290, 396/375 [1], and the 427/425 engines. This carburetor was rated at 780 CFM [2] and was a dual-feed model with vacuum secondaries. Another version of the 4150 was also used on the 427/430 ZL1 engine, but was rated at 850 CFM and included mechanical secondaries [3].

Holley carburetors are known for their performance, and are not generally thought of as an economy carburetor. However, with mild tweaking and keeping your "foot" out of it, a Holley carburetor equipped engine can achieve up to 15 miles per gallon. Horrible by today's standards, but pretty good in the late 60's!

Note that the base plates are different between first and second design (and reproduction) carburetors. Starting in late 1970, a new and improved thicker base plate was added to eliminate breakage or cracking when installing. These newer base plates detract from the value of an original Holley since an original base plate would be preferred on a restoration project. Correct base plate assemblies can also be identified by the number "172" stamped on the 1-11/16-inch diameter throttle blades (some may have "173" stampings).


1967 Holley
3910 Carburetor
1968/1969 Holley
4053 Carburetor
(Note incorrect accelerator pump
cover and screws, choke pull-off,
vent tubes, and baseplate)
1969 Holley
4346 Carburetor
(Note incorrect primary float
adjustment screw and nut)
1967 Holley 3910 Carburetor 1968/1969 Holley 4053 Carburetor 1969 Holley 4346 Carburetor

Detailed Pictures:

Holley "172"
stamping
Original Holley
Base Plate
(Driver side)
Later Holley
Base Plate
(Driver side)
Original Holley
Base Plate
(Passenger side)
Later Holley
Base Plate
(Passenger side)
Holley "172" stamping Original Holley Base Plate Later Holley Base Plate Original Holley Base Plate Later Holley Base Plate


1967 Holley 3910
Rear view
1967-1969 Holley
Venturi Casting
"6R 2829"
1967 Holley 3910
(Driver side)
1967 Holley 3910
Front view
1967 Holley 3910 - rear 1967-1969 Holley 1967 Holley 3910 - Driver side 1967 Holley 3910 - front


1967 Holley 3910
Primary Metering
Block "5417"
1967 Holley 3910
(Passengers side)
1967-1969 Holley
Correct Curved Neck
Choke Pull Off
1967 Holley 3910
Rear Float Bowl
and Vacuum Canister
1967 Holley 3910 1967 Holley 3910 - Passenger side 1967-1969 Holley 1967 Holley 3910


1968/1969 Holley
Primary Metering
Block "5583"
1967-1969 Holley
Secondary Metering
Block "4519"
1967 Holley 3911
Base Plate
1967 Holley 3911
Base Plate
1967 Holley 3911
Base Plate
1968/1969 Holley 1967-1969 Holley 1967 Holley 3911 Base Plate 1967 Holley 3911 Base Plate 1967 Holley 3911 Base Plate
 

Date Coding and Identification

"Bay City" casting
"Bay City" casting
Carburetor date coding and identification in the late 1960's can be very confusing. Unfortunately, since there was no requirement from General Motors dictating the structure, each supplier was free to use the format they wanted. Making things even more confusing was that the manufacturers didn't always stay with the same format or location. For instance, the location of the carburetor ID stamp may be in a completely different area from one year to the next. It also may have been different between carburetor models from the same manufacturer. Most carburetors will have an identification number, a broadcast code (the two letter designation that was used as "shorthand" for the complete part number by the assembly plant), and a date code. Some will have a change letter as well, indicating a revision of the carburetor. For instance, a change letter of "A" would indicate the first change to the carburetor. A change letter of "B" would indicate a second change, also incorporating the changes made in revision "A".

Not all Rochester carburetors have the "standard" seven-digit identification code. Although uncommon, original carburetors have been observed with the first two numbers ("70") omitted. In addition, Rochester carburetors manufactured at the Bay City, Michigan plant can be identified by the "Bay City" wording inside the Chevrolet bow-tie emblem cast into the carburetor body. Also note that many of the small parts on a Rochester Quadrajet have the "RP" (Rochester Products) logo stamped on them. The Carter-built Quadrajet carburetors won't have these stampings.


1967 Rochester Monojet (1BV) and 1967 - 1969 Rochester Dualjet (2GV)

1967 Rochester 1BV Monojet Tag Location
1967 Rochester 1BV Monojet
67-69 Rochester 2GV Dualjet
Tag Location
1967-1969 Rochester 2GV Dualjet
For these applications, the identification number, broadcast code, and date code was located on a triangular metal (aluminum) tag attached to the front of the carburetor on the driver's side of the car. This tag will contain not only the carburetor model number, broadcast code, and date code in a letter/number format (where the letter is the month of manufacture and the number is the year, e.g., C7), but also a change letter (if applicable) and an inspection stamp. Also note that these tags were different colors, depending on the application. This allowed assembly workers to quickly identify the correct carburetor without having to read the tag.

 

 

1967 Rochester 2GV
7027116
M6 DA Tag
(December, 1966)
1968 Rochester 2GV
7028110
E8 CH Tag
(May, 1968)
1968 Rochester
7028112
J7 CK Tag
(September 67)
1969 Rochester 2GV
7029112
K8 CK Tag
(October, 1968)
1967 Rochester tag 1968 Rochester tag 1968 Rochester tag 1969 Rochester tag


1967 Rochester Monojet (1MV) and 1967 Quadrajet (4MV)

1967 Rochester 1MV Monojet Tag Location
1967 Rochester tag location
1967 Rochester 4MV Quadrajet Tag Location
1967 Rochester tag location
For 1967, the Rochester Monojet (1MV) and Rochester Quadrajet (4MV) carburetors had the date code, identification number, change letter, and broadcast code stamped on a round metal disk pressed into a recess on the driver's side of the main body. The date code is again in a letter/number format where the letter is the month of manufacture and the number is the year, e.g., C7.

The Carter-built Quadrajet carburetors will have the "MFG BY CARTER" designation cast into the main body and used the same information location and date code format.


1967 Rochester 4MV
ID and Date Code Example
1967 Rochester 4MV
ID and Date Code Example
1967 Carter built Quadrajet
7027203 M6 DZ Tag
(December, 1966)
(Note the"MFG BY
CARTER" casting)
1967 Rochester
7027211 C7 LD tag
(March, 1967)
1967 Rochester 4MV codes 1967 Rochester 4MV codes 1967 Rochester 1967 Rochester


1968 & 1969 Rochester Monojet (1MV) and 1968 & 1969 Quadrajet (4MV)

1968/1969 Rochester 1MV Monojet Stamping Location
1968/1969 Rochester 1MV Monojet stamp
1968/1969 Rochester 4MV Quadrajet Stamping Location
1968/1969 Rochester 4MV Quadrajet stamp
Starting in 1968, the Rochester Monojet (1MV) identification number was roll stamped into the drivers side of the float bowl, along with the broadcast code.

The very early 68 Quadrajets (4MV) had the identification number, date code, and broadcast code stamped into the round metal disk pressed into a recess on the driver's side of the main body (like the 67 Quadrajets). Later Quadrajet carburetors were roll stamped into the vertical boss on the driver's side main body (just behind the secondary throttle shaft). The date code was stamped either on the base of the carburetor toward the rear on the driver's side of the car, or on the vertical boss next to the identification number. The date will be in a four-digit format (where the first three numbers are the Julian day and the last number being the year).

Carter-built 4MV Quadrajet carburetors will show the "MFG BY CARTER" designation and continued using the date code format where the letter is the month of manufacture and the number is the year, e.g., C8.


Early 1968 Rochester
7028212 J7 DH
(September, 1967)
Later 1968 Carter-built
7028212 D8 DH
(April, 1968)
(Note the "MFG BY
CARTER" & the Carter
date code format)
1968 Rochester
7028211 ED
Early 1968 Rochester Late 1968 Carter-built 1968 Rochester ED


1969 Rochester
7028218 EH
1969 Rochester
7029202 DH 1629
(162nd day of 69)
(Note the missing "70"
in the ID number)
1968 Carter-built
7028213 DY A8
(January, 1968)
1969 Rochester EH 1969 Rochester DH 1968 Carter built DY


1967 Carter (YF) 1 barrel

1967 Carter YF Tag Location
1967 Carter YF Tag Location
1967 Carter YF Stamping Location
1967 Carter YF Stamping Location
The identification and date code was either stamped on the lower flange of the main body where it meets the lower mount, or on a tag attached to the float bowl. The letter "S" followed the identification code and may have included a change code of "A", "B", "C", etc. The date code was in a letter/number format (where the letter was the month of production and the number was the year). The Chevrolet part number may also be present. Note that the letter "I" wasn't used.


1967 Carter YF
Tag Location
1967 Carter YF Tag
3905975 4367S H6
(August, 1966)
1967 Carter YF
"4367S" ID number
1967 Carter YF location 1967 Carter YF tag 1967 Carter YF ID


1967 through 1969 Holley

The identification number and the date of manufacture are stamped into the forward vertical surface of the air horn. The three digit date code is broken down with the first number being the year of manufacture, the second number (or letter) being the month of manufacture (1 through 0 for January through October, and then the letters A and B for November and December), and the third number being the week of the month. Service parts assembled 1973 or later will have four digit date codes.


1967 Holley
3916143 CT Stamping
Date code "742"
(2nd week of April, 1967)
1968 Holley
3923289 DZ Stamping
Date code "833"
(3rd week of March, 1968)
1969 Holley
3959164 GE Stamping
Date code "935"
(5th week of March, 1969)
1967 Holley CT 1968 Holley DZ 1969 Holley GE

Chokes

To aid in cold starting the engine, all 1967-1969 Camaro carburetors had automatic chokes that were controlled by a thermostatic coil located on the intake manifold or exhaust manifold. The only exception to this is the ZL1 carburetor, which did not include a choke.  

Usage

The charts below show what carburetor was used in each particular engine/transmission application. In addition to the Engine, Transmission, and Carburetor columns, there's a Chevrolet P/N column and an I.D. Number column. The I.D. Number is the number stamped on the carburetor. You'll notice that in some instances the Chevrolet Part Number and I.D. Number were the same. Usually they weren't. I've included the Chevrolet Part Number in case someone might stumble upon an NOS carburetor for sale or require parts to their existing carburetor, of which some are still available from Chevrolet! You will need the Chevrolet Part Number in these instances since Chevrolet references carburetors and components using the Chevrolet Part Number and not the I.D. Number.

The "early", "mid" and "late" indications in parentheses are relative. A carburetor change could have occurred fairly early in production, so "early" could mean only a few weeks or months into production and "late" would mean anything after that. Or the change may have occurred near the end of model year. If you are looking for a carburetor for an application with multiple versions, don't go by the I.D. number, but by the date of the carburetor.

Note that the same Chevrolet Part Number is sometimes listed for two different parts. Unfortunately we do not have access to the original parts lists and the Chevrolet Part Numbers that are shown below were derived from service information and other documentation, so we cannot determine all the original Chevrolet Part Numbers.

Also note that some of the I.D. Numbers have the corresponding two-letter broadcast code listed. You can help with the CRG's research on carburetors. If you know the correct broadcast code for a carburetor that's not on the list, please contact the . Thanks!


1967 Carburetor Usage
Engine Transmission Carburetor Chevrolet P/N I.D. Number
230/140 w/o A.I.R. Manual Monojet 1BV 7016544 7025003   BN
Automatic Monojet 1BV 7016543 7025000   
250/155 w/o A.I.R. Manual Monojet 1BV 7016627 7026027   BB
Automatic Monojet 1BV 7016628 7026028   BH
230/140 w/ A.I.R.
and
250/155 w/ A.I.R.  
Manual Carter YF 3905975 YF-4367S
Automatic Carter YF 3905976 YF-4368S
302/290 w/o A.I.R. Manual Holley 4150 3916143 3916143   CT
Holley # 3910
302/290 w/ A.I.R. Manual Holley 4150 3916145 3916145   CU
Holley # 3911
327/210 w/o A.I.R. Manual w/o A.C. Dualjet 2GV 7016718 7027101   CA
Manual w/ A.C. Dualjet 2GV 7016718 7027103
Automatic w/o A.C. Dualjet 2GV 7016719 7027110   CD  (early)
Dualjet 2GV 7016719 7027114   CL  (late)
Automatic w/ A.C. Dualjet 2GV 7016719 7027112          (early)
Dualjet 2GV 7016719 7027116   DA  (late)
327/210 w/ A.I.R. Manual w/o A.C. Dualjet 2GV 7037103 7037101
Manual w/ A.C. Dualjet 2GV 7037103 7037103
Automatic w/o A.C. Dualjet 2GV 7037112 7037110   CH
Automatic w/ A.C. Dualjet 2GV 7037112 7037112
327/275 w/o A.I.R.
and
350/295 w/o A.I.R.
Manual Quadrajet 4MV 7034591 7027203   DZ  (early)
Quadrajet 4MV 7034591 7027213   DZ  (late)
Automatic Quadrajet 4MV 7016702 7027202   DB  (early)
Quadrajet 4MV 7016702 7027212   DB  (mid)
Quadrajet 4MV 7035397 7027218   BC  (late)
327/275 w/ A.I.R.
and
350/295 w/ A.I.R.
Manual Quadrajet 4MV 7035323 7037203   DY  (early)
Quadrajet 4MV 7035323 7037213   DY  (late)
Automatic Quadrajet 4MV 7037202 7037202   DH  (early)
Quadrajet 4MV 7037202 7037212   DH  (mid)
Quadrajet 4MV 7035322 7037218   BD  (late)
396/325 w/o A.I.R. Manual Quadrajet 4MV 7016721 7027201   ER  (early)
Quadrajet 4MV 7036304 7027211   LD  (late)  [4]
Automatic Quadrajet 4MV 7034588 7027200   BL  (early)
Quadrajet 4MV 7034588 7027210   BL  (mid)
Quadrajet 4MV 7035396 7027216   BL  (late)
396/325 w/ A.I.R. Manual Quadrajet 4MV 7037211 7037201   EP  (early)
Quadrajet 4MV 7037211 7037211   EF  (late)
Automatic Quadrajet 4MV 7037210 7037200   EU  (early)
Quadrajet 4MV 7037210 7037210          (mid)
Quadrajet 4MV 7036300 7037216   BM  (late)
396/375 w/o A.I.R. Manual Holley 4150 3916143 3916143   CT  [1]
Holley # 3910
396/375 w/ A.I.R. Manual Holley 4150 3916145 3916145   CU  [1]
Holley # 3911


 

1968 Carburetor Usage
Engine Transmission Carburetor Chevrolet P/N I.D. Number
230/140
and
250/155
Manual w/o A.C. Monojet 1MV 7016823 7028017   BD
Manual w/ A.C. Monojet 1MV 7016823 7028015
Automatic Monojet 1MV 7016822 7028014   BB
302/290
and
396/375
Manual Holley 4150 3923289 3923289   DZ
Holley # 4053
302/290 (2X4) [5] Manual Holley 4160 3941140 3941140   (early)
Holley # 3810
Holley 4150 3942595 3942595   (late)
Holley # 4210
327/210 w/o A.C. Manual Dualjet 2GV 7016818 7028101   CG
Automatic Dualjet 2GV 7016818 7028110   CH
327/210 w/ A.C. Manual Dualjet 2GV 7016819 7028103
Automatic Dualjet 2GV 7016819 7028112   CK
327/275
and
350/295
Manual Quadrajet 4MV 7016849 7028213   DY
Powerglide Quadrajet 4MV 7016850 7028212   DH
327/275
TH-350 [6] Quadrajet 4MV 7016922 7029202   DH
396/325 Manual Quadrajet 4MV 7016817 7028211   ED
Automatic Quadrajet 4MV 7016858 7028210   EE  [7]
396/350 Manual Quadrajet 4MV 7016817 7028217   EG
Automatic Quadrajet 4MV 7016858 7028218   EH


 

1969 Carburetor Usage
Engine Transmission Carburetor Chevrolet P/N I.D. Number
230/140
and
250/155
Manual w/o A.C. Monojet 1MV 7016901 7029017   BD
Manual w/ A.C. Monojet 1MV 7016901 7029015
Automatic Monojet 1MV 7016902 7029014   BB
302/290 Manual Holley 4150 3923289 3923289   DZ
Holley # 4053
302/290 (2X4) [5] Manual Holley 4150 3957859 3957859
Holley # 4295
307/200 w/o A.C.
and
327/210 w/o A.C.
Manual Dualjet 2GV 7016903 7029101   CG
Automatic Dualjet 2GV 7016912 7029110   CH
307/200 w/ A.C.
and
327/210 w/ A.C.
Manual Dualjet 2GV 7016903 7029103
Automatic Dualjet 2GV 7016912 7029112   CK
350/250
w & w/o A.C.
Manual Dualjet 2GV 7016915 7029113   DC  [8]
Automatic Dualjet 2GV 7016916 7029114   DD  [8]
350/255
and
350/300
Manual Quadrajet4MV 7016923 7029203   DY
Automatic Quadrajet 4MV 7016922 7029202   DH
396/325
and
396/350
Manual Quadrajet 4MV 7016925 7029215   EH  [9]
Automatic Quadrajet 4MV 7016926 7029204   FF  [9]
396/375
and
427/425 (L72)
Manual &
Automatic
Holley 4150 3959164 3959164   GE
Holley # 4346
427/430 (ZL1) Manual &
Automatic
Holley 4150 3955205 3955205
Holley # 4296  [3]



Footnotes

Chevrolet
Service News
June 1967
Chevrolet Service News

[1] Although published data shows that early 1967 396/375 cars received the Holley 4160 series (list number 3811), no cars have been observed with this carburetor.

[2] Although Holley rates this carburetor as 780 CFM, Chevrolet specifications and advertisements showed it as 800 CFM.

[3] Early ZL1's were produced with Holley 4346's which were later retrofitted at the Gibb dealership with 4296's.
There is no broadcast code on the 4296. The 4296 rear accelerator pump requires the revised air cleaner with the vent tube with two 45° bends; the version with the 90° vent tube will hit the rear pump lever.

[4] As per the June 1967 Chevrolet Service News bulletin (right), the 7027211 carburetor was also installed on some 396/325 cars with automatic transmissions and serviced in the field by 7034589.

[5] Not installed from the factory. Available as an "over the counter" service item only.

[6] Some late 1968 327/275 cars came equipped with the Turbo 350 3-speed automatic transmission as part of an internal GM test fleet. The carb application used a 69 part number.

[7] The 396/350 (L34) 7028218 has also been observed on this application. Possibly due to shortages of the 7028210.

[8] The L65 actual observed usages are shown in the table and differ from published listings. The listings show the L65 with AC used the 7029115 (manual trans) and 7029116 DF (auto trans) carbs. Actual vehicle data shows that the L65 AC cars used the same carb as the L65 non-AC cars.

[9] The L35 actual observed usages are shown in the table and differ from published listings. Those listings show 7029200 as the L35 auto carb and 7029201 as L35 manual carb. Neither has been observed by the CRG on original L35 cars; all have had the L34 carbs.

 



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