Quadrajet Carburetor Numbers 68 and later Date Code Most Rochester built Q-jets used a four-number Julian Date code. The first three numbers are the Day of the Year the carburetor was built.
Jet 37001 Rochester 2g Circle Track 500 Cfm 2 Barrel Carburetor
76 and later will start with 170 2 - Decade produced.
Rochester carburetor cfm identification. These carburetor identification numbers start with 1705 or 1708 depending on whether they were built in the 70s or 80s. This video gives tips on how to identify the carbu. After 1972 the CFM rating on all three models was raised to 800.
All ratings 30 in HG. Rochester carburetors with a seven-digit part number starting with 700 through 704 were built before 1976. The last number is the Year.
1966 Rochester Quadrajet used on 327 Chevrolet engine with manual transmission no. Big Or Even Bigger 750 Vs. Match that with what we have in our carburetor kit listing and you are good to go otherwise you have to use the best guess method.
Most 1967-down Rochester carbs have a triangular aluminum or brass tag retained by a screw attached to the top of the float bowl. According to the Rochester BookThe 2G carbs came with two different flange sizes and 5 different CFM ratings. Carburetor Identification Service.
It is not set in stone because it is a documented fact that Rochester didnt follow these rules 100. Full Size View Parts Page Diagram. These carburetor identification numbers start with 1705 or 1708 depending on whether they were built in the 70s or 80s.
Chevy Classics February 2013 11 Source. Rochester Tri-Power carburetor kits. Full Size View Parts Page Diagram.
The center carburetor is used for the idle low speed circuit. Eight-digit casting numbers began in 1976. Brass Series ACGH 1909 1922 1 barrel updraft have no information to further identify these units.
702 - 1960s 703 - 1060s with AIR. The outer carburetors also dont have idle mixture screws. If your 4M 4MC or 4MV Quadrajet was built before 1972 it is a 750 cfm carburetor.
1705 series numbers would identify 1976 to 1979 carburetors. Eight-digit casting numbers began in 1976. Rochester 1 barrel M MV 1ME 1MV Monojet.
There should be a metal disc affixed to the carburetor for those in the 1965 to 1968 range and the number was stamped into the unit without a metal disc on the later-year models. 70 will appear on all late 60s Rochester Carburetors. Carter Holley Marvel MarvelSchebler Rochester Schebler Stromberg Zenith.
The 2GC is the carburetor in the middle and would have the automatic choke attached. Rochester 2 barrel 2G 2GC 2GV 2GE Two Jet. Rochester 4 Jet Identification When you have the carburetor number stamped on a tag attached to the top of the carburetor then that is golden.
The front and rear carburetor does not have a choke. These are the 2G and 2GC carburetors. The Rochester 4-Jet carburetor was a downdraft four barrel carburetor produced by the Rochester Products Division of General Motors from 1952 until 1967.
1965 to 1967 Quadrajets had a round bottle cap tag on the front drivers side. 1 38 venturi 435 CFM. Rochester 2 barrel 2SE E2SE VaraJet.
Carter also produced carburetors with OE. 1705 series numbers would identify 1976 to 1979 carburetors with 1708. The last application was on Chevrolet trucks in 1967.
1 12 Flange carbs all have 1 1116 bores. 7026203 - number is on the blue bottle cap visible on the throttle side Design The QJet is a large 4 barrel carburetor that has a small primary side for fuel economy and good emissions and a large secondary side for good performance. Rochester 1 barrel B BC BV.
It is for Quadra-jet carburetors only. 1 316 venturi 352 CFM. Full Size View Parts Page Diagram.
It was first used on Oldsmobile and Cadillac in 1952 and was used on GM Packard and Studebaker cars and trucks into the mid 60s. For the 1980 and up carburetors the fourth and fifth digits are the last two digits in the year in which it was produced. All two-barrel carburetors had a cfm range of 285 to 450 cfm and the original 2G used a manifold-mounted thermal-spring assembly that connected to the choke via a linkage rod.
1 14 venturi 381 CFM. The last three digits will unfortunately give you no information about the carburetor unless you have a Rochester numerical reference chart. ID numbers for a Rochester Quadrajet carburetor are found next to the throttle level.
Calibrations with the Carter numbering system which is 4 numbers followed by the letter S on the quadrajets. 1 516 venturi 423 CFM. ID numbers for a Rochester Quadrajet carburetor are found next to the throttle level.
There are two different size throttle bores on Rochester two-barrel carburetors one is 1 14 and the other is 1 12 inches. This guide is just that. 1 14 flange 1 716 Bore x 1 332 venturi 278 CFM.
Tips on identification of various carburetors. Identification Number Decoding It is not uncommon for confusion to arise when decoding a Quadrajet carburetor. According to Recarbo Fuel Systems.
This is the number you need for decoding. Before that they are found on a tag. Rochester carburetor numbers are stamped into the float bowl of the carburetor starting in 1968.
Carburetor number 17058201 followed by a Julian date of 1238 would have been built the 123rd day of 1978. There should be a metal disc affixed to the carburetor for those in the 1965 to 1968 range and the number was. Identification codes indicate the car or truck a carburetor was designed for and what transmission it was used with.
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