Is a Rochester quadrajet a good carburetor?
Is a Rochester quadrajet a good carburetor?
A lot of good and bad has been written about the use of a Rochester Quadrajet carburetor as a replacement four-barrel. The truth is, a properly tuned Quadrajet can be just as efficient and reliable as a bolt-on substitute performance carburetor.
How do I know what Rochester carburetor I have?
All Rochester carburetors, including the Quadrajet, are identified by a 7-digit or 8-digit part number; the earliest units, made before mid-1968, had a round metal tag attached to the fuel bowl. The 7-digit part number ran around the outside edge of the tag.
What CFM are quadrajet carburetors?
Most Quadrajets were capable of 750 cu ft (21,000 l)/min (cfm) maximum, but some rare Buick and Pontiac models were capable of 800 cu ft (23,000 l)/min for use on high performance engines, and most 1984-1987 pickup trucks were also equipped with the 800-cfm carb.
What size is a quadrajet?
Two basic sizes of Quadrajet were produced over the years; 750 and 800 CFM versions. The 800 CFM unit (identified by a slightly larger primary venturi) was relatively rare, found only on 1971-73 Buicks and 1973 Pontiacs.
Where are the numbers on a Rochester Quadrajet carburetor?
ID numbers for a Rochester Quadrajet carburetor are found next to the throttle level. 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. This is the number you need for decoding.
Does Rochester still make carburetors?
When looking under the hood of most classic Chevy’s, odds are you are going to see some version of a Rochester carburetor. Although the manufacturer did not start their storied existence by manufacturing carburetors, their fuel-delivery offerings were — and still are, a mainstay with Chevrolet enthusiasts.
How to rebuild a Rochester Quadrajet 4 barrel carburetor?
Rochester Quadrajet, 4 barrel carburetor rebuild kit. Don’t trust your rebuild on less. Picture illustrates what is included in this kit. May include extra parts. Use the best fitting. Polish the pump well with crocus cloth, or 2000+ sandpaper. The pump needs a smooth glide. Apply 2 dabs of lithium grease to the pump cup.
What is the part number for a Carter Quadrajet?
Any and all replacement parts between Carter and Rochester are directly interchangeable. Carter Carburetors built Quadrajet carburetors for GM cars from 1966 into the late ’70s. If the Quadrajet you’re looking at has a seven-digit part number ranging from 702 through 704, these were built before 1976.
What does the m stand for on a Rochester Quadrajet?
The “M” after that, is a style/model type. Early Rochester four barrels were a “G” series. So, a 4M is a Quadrajet, and a 2M is a two-barrel Dualjet. The next letter, V, C, or E stands for the type of the choke’s thermostatic coil. If there is an E before the number 4, that designates an electronically-controlled carburetor.
What kind of carburetor does a 750 CFM Quadrajet have?
When looking through the primaries, if you see a pronounced bulge protruding from the side of the wall surface, you have an 800 cfm carburetor. The primary wall of the 750 cfm unit does not have this bulge, and is consistent throughout. In the early ’80s, GM incorporated electronic connections to the Quadrajet.
What kind of carburetor is a 1966 Rochester Quadrajet?
1966 Rochester Quadrajet used on 327 Chevrolet engine with manual transmission, no. 7026203 – number is on the blue ‘bottle cap’ visible on the throttle side 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.
How did the Quadrajet carburetor become a success?
This new carburetor was blended with what Rochester knew about carburetors, mixed with ideas from other manufacturers, (spread-bore design and vacuum secondaries). The Quadrajet became an instant success. The Quadrajet carburetor was available on GM passenger and performance cars, as well as its trucks. Image courtesy www.chevytalk.com
Any and all replacement parts between Carter and Rochester are directly interchangeable. Carter Carburetors built Quadrajet carburetors for GM cars from 1966 into the late ’70s. If the Quadrajet you’re looking at has a seven-digit part number ranging from 702 through 704, these were built before 1976.
What kind of Quadrajet does a 1980 Chevy truck have?
1980 Chevrolet truck Quadrajet, M4MC type (hot air choke), no. 17080213. M4MC Quadrajets have an integral choke and a different airhorn design; also, the throttle shafts are longer than in 4MV carbs. Starting in 1968 carb numbers were stamped on the driver’s side, near the back.
