How many CFM is a Rochester 4GC?
Earlier 4GC models were only available in 486, 553, or 692 CFM. Quadrajets can range anywhere in between 600 and 800 CFM. Most are rated 750 CFM or higher.
How do I know if my Quadrajet is 800 cfm?
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.
Who owns Rochester carburetor?
Historical Information. The Rochester Components plant has been building automotive components for over 75 years. It is the original home of the Rochester Products Division of General Motors and is well known for manufacturing the Rochester Carburetor.
How do I know which Rochester 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.
How do you know the CFM of a Quadrajet?
The carburetor on the left has the bulge (arrow), and is an 800 cfm unit. The one on the right does not have the bulge, which makes it a 750 cfm unit. 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.
Did Holley make a Quadrajet?
Holley’s products include carburetors, fuel pumps, fuel injection, intake manifolds, and much more. From start to finish, Holley has the parts to make your dream a reality….Features:
Barrels | 4 |
---|---|
Billet Color | None |
Booster | Straight |
Brand | Holley |
Carburetor Use | Street |
What is the difference between Holley and Rochester 4G carbs?
Some later 4GC’s used a larger flange size similar to that used on Carter AFB’s, but narrower than the square bore Holley flange. When interchanging GM carbs of the 50’s and early 60’s, check the flange size on the manifold carefully. Rochester 4-Jet carbs came in three general versions: 4G with manual choke and governor in heavier trucks
What is a Rochester 4-Jet carburetor?
The Rochester 4-Jet carburetor was a downdraft four barrel carburetor produced by the Rochester Products Division of General Motors from 1952 until 1967. It was first used on Oldsmobile and Cadillac in 1952 and was used on GM, Packard and Studebaker cars and trucks into the mid 60’s.
Where is the choke on a 4 jet carburetor?
4GC with an automatic choke mounted on the side of the carburetor Although the 4-Jet is generally referred to as a ‘square-bore’ carburetor, many had substantially larger secondary bores than primary bores, especially in early 1960’s Buick and Pontiac versions.
Can I remove the choke Stat cover from the carburetor?
NOTE: (78), (79) and (80) Water heated type choke stat cover may be removed from carburetor on engine to eliminate draining of coolant. (Leave water hoses connected).