How do I know what Quadrajet carburetor I have?
All Rochester Quadrajet carburetors are identified by a seven- or eight-digit GM part number. On units made before mid-1968, the part number was stamped around the outside edge of a round metal tag attached to the fuel bowl.
Are Rochester carburetors still made?
In 1995 Rochester became part of Delphi, which in turn became a separate company four years later, and continues to manufacture fuel injection systems in Rochester, now part of General Motors Automotive Components Holdings- Rochester Operations.
What is a Rochester carburetor?
The Quadrajet is a four barrel carburetor, made by the Rochester Products Division of General Motors. Its first application was the new-for-1965 Chevy 396ci engine.
Are quadrajet carburetors any good?
A lot of good and bad has been written about the use of a Rochester Quadrajet carburetor as a replacement four-barrel. Some enthusiasts love them while others avoid them like the plague. The truth is, a properly tuned Quadrajet can be just as efficient and reliable as a bolt-on substitute performance carburetor.
How do I identify my Rochester 1 barrel carburetor?
The Rochester 1 barrel used a small metal tag attached to one of the float bowl screws for identification. When the tag is missing, check the bottom of the mounting pad. If you find 4 numbers add 700 to the front of the 4 numbers and that will give you the carburetor number.
How do I identify my Rochester 2 barrel?
All Rochester carburetors are identified by a seven- or eight-digit part number. The earliest units, made before mid-1968, had a triangular metal tag attached to the fuel bowl. The seven-digit part number is listed on the tag.
How do I know what kind of carburetor I have?
Look at the upper front of the carburetor on the piece known as the airhorn, or choke tower. This is a rectangular part of the carburetor with rounded edges, open to the top of the part. There will be a small number stamped there.
How is float drop measured?
With float hanging freely, measure from gasket surface to lip of plastic float, or bottom of metal float. Check the float drop to make sure the needle doesn’t fall out, or gets stuck to the side. Here is a remark from one of our Youtube watchers: A few years ago I had a condition where the float drop was too low.