What is the CFM of a Quadrajet carb?
750 CFM
Quadrajets can range anywhere in between 600 and 800 CFM. Most are rated 750 CFM or higher. Quadrajets are used by many GM street car enthusiasts; however, they are also disliked by just about as many.
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. In the early ’80s, GM incorporated electronic connections to the Quadrajet.
How many CFM is a Rochester 4gc?
Produced in 486, 553, and 692 CFM ratings, the 4G uses a squarebore layout with a conventional fixed jet, power valve and accelerator pump metering scheme.
What is a Thermoquad carburetor?
The final Chrysler use of four-barrel Carter carburetors was the Thermo-Quad, which used a lightweight thermoplastic float bowl, on the most powerful Chrysler engines. Carter produced Rochester Quadrajet carburetors for their rival maker whenever demand outpaced Rochester’s ability to make them.
Are all Quadrajet the same cfm?
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.
Who makes quadrajet carburetor?
Rochester Products Division
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.
What size is a Quadrajet carburetor?
The Quadrajet has 1 3/32- or 1 7/32-inch primary throttle bores with either 750 or 800 cfm. It has been proven you can modify the Quadrajet to flow in excess of 1,000 cfm.
What CFM is a ThermoQuad?
800 cfm
Wide-open, the “small” TQ was rated at 800 cfm, while the larger unit spec’d at 850 cfm, blowing away the airflow capacity of any previous OEM Mopar four-barrel. While the ThermoQuad certainly had the flow to support big power, the timing of events curbed its chance at glory as a high performance carb.
Is it legal to replace Q jet carburetors?
The Performer Series for Q-Jet Applications are stock replacement and street legal in 50-states for the Chevrolet/GMC vehicles listed under each carburetor description. Q-Jets were original equipment on some of the most popular Chevy and GMC engines on the road today.
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.
How big is the needle on a Q jet carburetor?
This carburetor is a high performance version of the Q-Jet calibrated for use with the Performer RPM Q-Jet manifold and other high performance, non-emissions applications. It has an 850 cfm air flow capacity, and the .149″ diameter needle and seat assembly provides fuel flow to support 500+ horsepower.
Is the CFM rating on a Q Jet the same as a 455?
“CFM rating” is simply the wrong question to ask about a Q-Jet. The carbs themselves are all the same, with a very very few exceptions that came on motor homes and some 455s and such in the early 70s. I don’t think I’ve ever seen one of those in all the years and the hundreds of Q-Jets I’ve had or worked with.