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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.


 


More Videos...


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





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.





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)





re-jet your Quadrajet (part 2)
rejetting a Quadrajet





Identifying Quadrajet vacuum ports
I always see a lot of questions about what various vacuum ports do on a Quadrajet. Here's a general guide that will point you in the right direction. Remember that there were many different Qjets over the years and vacuum port locations and number will vary. This video is representative of 1975-90 carbs. Enjoy!





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





How to measure and adjust Quadrajet float level
I have had several requests for this, so here you go: 1. The airhorn has to be removed to do this, but the carburetor does not have to be removed from the engine. 2. Some data says to measure from the toe(end that is opposite from the hinge), some say 5/16 inward from the end, etc. I suggest following the specs for your particular carburetor. 3. With the float in the raised position and the inlet needle lightly seated, measure from the top of the float to the top edge of the carburetor with NO gasket in place. If you have to adjust the float, bend at the area that has the cutouts, 4, If you are experiencing flooding issues then it is an excellent time to install a new needle/seat and float and that should cure flooding problems that are not choke-related.





for Tim - Rochester tips





Rochester Carburetor Trick!
If your Rochester Quadrajet or Dualjet Carburetor is Hesitating try this Trick!





How to diagnose a Quadrajet part 3
Let's take a look inside





Carburadores - Reconstrucción, Diagnóstico, y reparación - 8 de 9 - www.tusfrenos.com
www.tusfrenos.com Somos una Organización dedicada a la venta de repuestos, teniendo como principales líneas de productos los frenos, embragues y filtros, para cualquier tipo de vehículos. Operamos a nivel nacional despachando a toda Venezuela. Conocemos el mercado Venezolano y sus necesidades, es por eso que ofrecemos a nuestros clientes una amplia cartera de productos a través de nuestra página web. Contamos con un amplio inventario de productos de las principales marcas del mercado en FRENOS Y EMBRAGUES: AETNA AP ASCO ATE BENDIX BOSCH BOSCH/BENDIX CHEVRON CRT DAIKIN DIERO/ZHEJIANG DUROLINE FRAS-LE IBK ILLINOIS KOYO L&S LEXTRON LPR LUCAS LUCIFLEX LUK LUK / PERFECTION MATRICERIA VICTORIA MIDWEST NACHI NAMCCO NSK NSK / PERFECTION NTN PERFECTION PIONEER RAYBESTOS SACHS SANGSHIN SECO SEIRE SEIRE AP SEOJIN SIA/SEIRE SNT TCIC TOYOTA TRW VALEO VARGA VARGA/TRW VELVETOUCH Para los siguientes aplicaciones: Frenos en Venezuela: * Bandas * Bloques y Rollos * Bombas de Freno * Calipers * Cilindros de Rueda * Discos de Freno * Equipo Pesado Frenos * Hidrovac * Kits de Frenos * Liga de Freno * Mangueras de Freno * Pastillas * Tambores Embragues en Venezuela: * Bombas de Embrague * Caras de Disco * Collarines * Crucetas * Discos de Embrague * Equipo Pesado Embragues * Kits de Embrague * Platos Manuales de Vehiculos en Venezuela: * Manuales de Taller * Manual de Usuario Para Fitros en la linea de carga pesada en Venezuela contamos con las marcas: Baldwin Filters www.baldwinfilters.com GFC Performance www.globalfilters.net Parker Racor www.parker.com/racor Mann Filter www.mann-filter.com Donaldson www.donaldson-filters.com Fleetguard www.cumminsfiltration.com Tecfil www.tecfil.com.br Purolator www.pureoil.comwww.purolator.com.br Para los siguientes aplicaciones: * Filtros de Combustible Separadores de Agua * Filtros de Combustible Gasolina y Diesel * Filtros para Aceite Lubricante * Filtros para Aceite Hidraúlicos * Filtros para Aire * Filtros para Aire Acondicionado (Habitáculo / Cabina) * Filtros para Transmisiones y Diferenciales * Filtros Secadores para Frenos de Aire * Filtros Secadores para Aire Acondicionado * Filtros para Refrigerante FRENOS, EMBRAGUES, FILTROS, MANUALES, VENEZUELA, TUSFRENOS, REPUESTOS, WWW.TUSFRENOS.COM" "Más Información en http://www.metacog.com"





Most relaxing sound for men - Old-School American V8 Corvette C3 1979 (Stingray)
Includes Cold engine idle, warm idle and a bit of revving to about 4500 RPM. I decided to create this video since my Vette now sounds quite loud thanks to the Cherrybomb glasspack Exhaust and removal of the catalyst. The Exhaust is basically stock. I think this is one of the most relaxing sounds for men who are into cars and machines :) Engine: 5.7 L (350 cid) V8 L-48 Transmission: Warner 4-Speed Manual My Corvette is generally in very good condition and it has already been restored once in USA some years before it arrived in our country. I got the car in a state where the exterior + drivetrain were fine, but the interior needed new carpet, some painting and several other components in order to look great. I'm now pretty much done with the interior. The engine used to have issues but those were mostly external (bad thermostat housing, bad spark plug wires etc.). By now the engine is a pleasure to drive, but the Rochester Quadrajet carburetor has hard time keeping the pre-selected idle speed and sometimes wants to hold it higher, then lower. It might be also some extra fuel leaking in from somewhere occasionally. There used to be some vacuum leaks but I've taken care of them. Perhaps I will replace the intake + carb with an Edelbrock setup for next driving season. The engine compression has been measured recently and the results were perfect for all cylinders. NB! We will soon try to film the Vette from another car when driving on a motorway. I'm hoping to get some good footage that way. For more information and work history on my Corvette, Suburban and ex-Jeep Grand Cherokee, please visit my blog at http://www.georgescarblog.com .





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.





'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





Quadrajet sound
Q jet secondary operation




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