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Decoding a Rochester Quadrajet part 1: The name

Rochester Quadrajets tend to mystify people because of the various model names assigned to them by GM. Add to that a redesign in the '70s and the confusion only grows. In this video we'll learn the different model names and also how to differentiate between early and later-model Qjets. Enjoy!


 


More Videos...


Decoding a Rochester Quadrajet part 2: Breaking down the numbers
In this clip we'll learn how to decipher the Identification number and julian date code on the Rochester Quadrajet.





re-jet your Quadrajet (part 1)
rejetting a quadrajet





750 vs. 800cfm Rochester Quadrajets-how to tell them apart
There exists a ton of misinformation regarding the actual airflow capacity of the Rochester Quadrajet. Not many people know how many variations there are or how to tell them apart. Here is a simple video explaining how to identify each size based on casting design. I will cover the "cfm-limited" carbs in a separate video.





How to adjust Quadrajet secondary air doors
These take some trial and error to get them adjusted so that there is no bog, but it's not hard to do-here's how.





Adjusting High Idle on a 4 Barrel Rochester
Adjusting the high idle on a 4 barrel Rochester Carburetor.





Q-jet overhaul
Rochester Quadrajet parts description and overhaul discussion





How To Adjust Fuel And Float Level On Holley Carbs
Holley demonstrates how to properly adjust the fuel level and the float on Holley four-barrel carburetors.





New quadrajet set up
New air-gap manifold and custom/rebuilt q-jet. Sounds good but I still need to set the timing on the distributor and the carb is tuned already. Hope you like, nothing to fancy just a few revs and walk around...the Exhaust is true dual no x/h pipe and it has cherry bomb glasspacks(3 inch)





How to identify 4 barrel carburetors
Here's a guide to help identify the most common 4bbl carbs including Edelbrock, Quadrajet, Holley and Thermoquad. There are a few older or more obsolete carbs not shown including Rochester 4G, Autolite-Motorcraft 4100/4300/4350 and Carter WCFB that I'll detail in the future provided I can actually find one.





The Infamous Quadrajet Moan
Making a full-throttle pull on the chassis Dyno with our 1972 Pontiac Trans Am with 455 H.O. engine.





'77 Chevy K20: Quadrajet Choke Pull Off and Fast Idle Cam Observations
1977 Chevy K20. 350 crate engine. Rochester Quadrajet 4MV carburetor with divorced choke. Truck suffers from unexplained hesitation and bogging when in forward gears. Tends to rev just fine after a few minutes of mixed idling and high revving. Checking choke operations as well as a possible sticky fast idle cam as part of the process of elimination. - Truck is allowed to idle/warm up until 2:25 mark, at which point the engine is revved to about 2,000 rpm, and can be heard bogging (a hissing sound can be heard). The fast idle cam is seen dropping. Fuel flow can be seen in the glass-cased fuel filter right before the carb as remaining steady. - The engine is revved again about three more time up until 3:00 minute mark. The engine revs slightly higher, but the hissing and bogging can still be heard. - Engine is revved again at the 3:35 mark, slightly past the 3,000 rpm mark. Hesitation and hissing still evident, but less so than before. - Engine revved at the 4:25 mark to about 4,000 rpm. No hesitation or hissing heard. - Transmission is slowly shift through every gear starting at 4:55 mark. Shifted back into Park at 5:05 mark. - Engine revved again at 5:10 and 5:17 marks to 4,000 rpm. No hesitation or hissing is heard. To read up on the discussion, please visit the following thread: http://www.hotrodders.com/forum/1977-chevy-k20-engine-suffers-hesitation-po wer-loss-when-drive-213757.html





Setting the timing and adjusting the carb
Set the timing by ear, and got the idle slowed down so I could do a little adjusting on the carb. I'll do more when it's cold, so I can set the choke and all. Love the way it's sounding..





Setting The Transmission Kickdown On TH-350, TH400, And 700R4
Holley offers tips on properly setting up the transmission kickdown levers on GM turbo Hydro 350 and 400 automatic transmissions. The video also demonstrates how to properly set the throttle valve, TV cable.





1958 Cadillac Runs After 15 Years!
I bought this Cadillac and it hadn't run in 15 years. It was missing the carburetor and the previous owner I guess thought that was the problem. Well, the carb was lost by the mechanic over the years. I borrowed one from a 1963 Pontiac parts car I have. Turns out the fuel pump was bad but I got it running in 20 second spurts with a gravity feed. I used a funnel, a hose and filled it with gasoline. It worked until the gas ran out but it was a good way to test a few things. At least I spark, compression and oil pressure and that all the valves were opening and closing.





How to rebuild a Rochester Quadrajet part 10




Which car is faster? Which Car is Faster?





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