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So under rated.

Nothing sounds like a quadrat jet that sound is unmistakable

Thank You for the help

On a stock 400 1976 pontiac trans am would the carb from a 69 gto work well???

Do you have any videos on a 1965 -442 one year only carb? Thanks

couldnt hear at time what you were saying.

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They were rated at 750&800 cfm. Nothing they were ever used on could ever pull enough air to max them out. They were always sized perfectly because they only flowed what the engine could pull.

I've got a 1000 CFM Quadra-FLUSHER on my 455 shit box tuna boat...wtf u talken bout willis?

I have a 1980 Pontiac Grand Prix SJ 301 Engine W-72 has Spark Detonation sensor. 170 horsepower, Quadrajet carburetor. But from the Factory, and I bought it new. The top Secondary Air Valves. Are set to open only to 3/4 . The factory has a small. tab Added on outside end of the Secondary Air Valves shaft. On the right side. Too keep Air Flow down. I know for sure, that is why they did it . Because, I cut down that Tab. AND THE ENGINE COULD NOT TAKE that BIG FLOW OF AIR. ENGINE RAN real bad .When I Floored the Throttle . SO I HAD TO ADD METAL ON . TO STOP SECONDARY AIR Flaps FROM OPENING TOO MUCH. I checked up on that. YES , that is how on cars that had a lot of Emission Things. And the Exhaust was small. General Motors - Pontiac , cut back the Air Flow. That Carburetor would, put out .And would flow in and out of the Engine . And the Engine runs great now again . I bet it now flows maybe 680 CFM to 700 CFM of Air.

I ended up having 2 800cfm ones. Been looking for a 750 for my 355sbc in k10. Guess a 800 will work..?

You're 100% correct, two Q-jet CFM ratings, 750 and 800. Iv'e been a Pontiac guy all my life owning GTO's and Trans Ams. I some how got into rebuilding and calibrating Q-Jets for Pontiac enthusiasts and my own Pontiacs and I was wondering if you guys ever saw a factory single boost primary Q-jet? The're really a odd duck. I've had three of them in my life time, they were installed on some 1971 GTO's and they flowed 800 CFM. They really ran strong! I ran one on some of my Ram Air lll's and a Ram air lV.

Thats great information to know. I'm gonna have to rebuild my carbs on my 430 and 455 Buick engines. Great 👍 video

We had an old Chevy van at work, 220,000+ miles. The quadrajet carb on it looked liked a big lump of grease; Van always started and ran perfectly.

Can I use this method for my valve springs?!

So I’m sitting here watching the video and I’m thinking, “I need to find a local place that has this kind of knowledge” and then I notice the phone number, is that a 631 area code? Suffolk? I’ll have to look this up

They also used those on the Pontiac 250 CID OHC 6 cyl. Sprint engines in the A and F body cars. I've always kept the original Quadrajets on all my cars from the 301 to my current 455 Trans Am and always had a fast car with great throttle response and driveability. If you set them up right, they're trouble-free for many miles!

Excellent video. I got a 383 stroker coming to replace my stock 350 in a 78 k-20. Its supposed to have 410 horse. 750 cfm means I can use my 350 intake, and quadrajet.

i just took a 750 and filed down the ridges and polished the barrels

So then why did a 76 poncho 400 have a Qjet 850 as advertised?

They even use these carburetors on a lot of boats! I have a OMC 4.3L V6 with a 750 CFM Quadra jet! Factory horsepower rating is around 220 I believe! It runs almost as good as a fuel injected engine!

Hi James, this was one of the best videos I have seen on the Rochester Q-Jet carb. I have a 1981 Trans Am which I purchased as a young man back in 1989. I since removed the 301 turbo and replaced it with a 1968 Pontiac 400 with HO heads period correct and it has an Edelbrock square bore intake. I bought the engine complete and had a speed shop install it back in the mid 90's The carb on it is a Holley 750 double pumper, yes I know what your saying, its way to big and yes I figured that out recently. (note this car was in storage from 1996 until 2018) I was hoping I could speak with you briefly on what direction to go in regards to the intake and carb combination as I'm seriously think of going back to the stock intake with a Q-jet carb. Please advise

Great tips about the two sizes. I always thought they were a 650 but, good to know they are a 750 and 800 only. To me many people think they are junk so, they are cheaper to pick up at swap meets. I always love to pick them up since people always want Holley's instead.

if you run class part number has to be correct

Will a Rochester Quadrajet work well on an Olds 425, pumping 550-600 hp?

I found one from an engine that sat in a shed on a 400 Pontiac didn't do a thing to it stuck it on my 305 and it runs fine starts good throttle response good it is an 800 I believe wanna trade for the one I need for my 305 it was a 78 transam motor sat in the shed since 99 lol

I have an 800 off a 78 trans am ill trade for a good rebuilt one setup for a stock 305 this 800 is running it but i know it could be much better

I put a kit in a 1405 the other day for a guy and he bought the Chinese kit. The hole for the linkage on the accelerator pump was drilled too small and it was drilled lower than the original pump causing the pump to bind. Buy the Edelbrock kits and not the other crap. It will save you time and headaches.

Great video. That's what I've always loved about the Qjet...it's infinitely adjustable. And that's why they came on practically every kind of engine application found in an automobile. Engines that had to start and run everyday in all traffic and all weather conditions and STILL deliver high performance when it was called for. If Edison invented a carburetor it most likely would have been a Qjet. Thanks again and Semper Fi!