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SDLuck's Photo Album. Wow that's allot more than I thought it would be What do y'all think I should list it as? Wiki Editor.

Wiki Edits: The Holley was made to be a direct replacement for a Rochester Q-jet. They were emissions compliant and you'll notice there's no external float adjustment and the location of the fuel inlet is the same as a Chevy Q-jet. Unfortunately, they are not in demand. I doubt you'll be able to get much more than a core price for it the way it sits. You can advertise it as a Holley cfm model , List part number , spreadbore Q-jet replacement carb. Good luck. There are literally dozens of different part numbers for Holley spreadbore carbs: some emissions legal and some not, there are and models, and cfm, single and double pumper, etc.

But the the OP has is a , just so there's no confusion. FmrStrtracer's Photo Album. Thanks guys for helping me identify it!

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Holley Carburetors: How to Rebuild

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Where Are Holley Carburetor ID Numbers Located?

The fuel line inlet is located on the front of the installed carburetor. The 2GV models specified for cars with air conditioning had a "hot idle compensator" feature. When high underhood temperatures occurred during idling, the compensator supplied additional air to offset excessive fuel vaporization. The medium- and high-performance power plants received the Rochester "Quadrajet" 4MV four-barrel carburetor. Rated at CFM, this was a carburetor that could deliver good performance out of the higher power engines when the secondaries were opened, yet still retained good gas mileage under normal conditions, due to the small primaries.

Rochester carburetors were known for their simplicity and reliability. Air Injection Reactor, aka "Smog". 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.

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This carburetor was rated at CFM [2] and was a dual-feed model with vacuum secondaries. 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 , 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. 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.

Holley Four Barrel 4150 and 4160 Carburetors Explained

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.


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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.

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.

The letter "S" followed the identification code and may have included a change code of "A", "B", "C", etc. The Chevrolet part number may also be present. Note that the letter "I" wasn't used. 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 or later will have four digit date codes.


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  • The only exception to this is the ZL1 carburetor, which did not include a choke. Number column. The I. Number is the number stamped on the carburetor. You'll notice that in some instances the Chevrolet Part Number and I. 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. 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.