Q jet cfm - The 1947 - Present Chevrolet & GMC Truck Message Board Network

70 Bowtie · 12-31-2005, 12:45 AM

Hey all,

I found these #'s on the base of my carb, 0258, and these on the main body, 7032750. Is this q jet a 650?

Thank for your help in advance

Brett

Blazer1970 · 12-31-2005, 08:38 AM

No such thing as a 650 Q-Jet. They are pretty much all 750 cfm (some are 795/800 cfm, but not on small blocks). The Q-Jet is set up so that the secondaries open based on engine demand, so there is no issue with it being "too much carb" for the motor.

**special-K** · 12-31-2005, 09:58 AM

I think they are 780 cfm.They are great for various displacements/hp-ratings due to the spread bore design,smaller primaries.

70 Bowtie · 12-31-2005, 08:49 PM

Thanks for the info!!!!

Brett

see ten · 01-01-2006, 03:08 PM

Quadrajet CFM is different depending if your carb is for a truck or a car. The trucks have more flow than the one for cars. I am not an expert and I am sure that there are exceptions (high performance cars) but I do know that all Quadrajets are not the same CFM.
http://www.hemmings.com/index.cfm/fu...article_id/498

12-31-2005, 12:45 AM	#1
70 Bowtie Registered User Join Date: Jul 2005 Location: South Dakota Posts: 70	Q jet cfm Hey all, I found these #'s on the base of my carb, 0258, and these on the main body, 7032750. Is this q jet a 650? Thank for your help in advance Brett

12-31-2005, 08:38 AM	#2
Blazer1970 Registered User Join Date: Dec 1999 Location: Old Mission, MI, USA Posts: 2,510	Re: Q jet cfm No such thing as a 650 Q-Jet. They are pretty much all 750 cfm (some are 795/800 cfm, but not on small blocks). The Q-Jet is set up so that the secondaries open based on engine demand, so there is no issue with it being "too much carb" for the motor. __________________ Tim Last edited by Blazer1970; 12-31-2005 at 08:40 AM.

12-31-2005, 09:58 AM	#3
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,852	Re: Q jet cfm I think they are 780 cfm.They are great for various displacements/hp-ratings due to the spread bore design,smaller primaries. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

12-31-2005, 08:49 PM	#4
70 Bowtie Registered User Join Date: Jul 2005 Location: South Dakota Posts: 70	Re: Q jet cfm Thanks for the info!!!! Brett

01-01-2006, 03:08 PM	#5
see ten WTB this ad Join Date: Sep 2004 Location: Lafayette Georgia Posts: 5,074	Re: Q jet cfm Quadrajet CFM is different depending if your carb is for a truck or a car. The trucks have more flow than the one for cars. I am not an expert and I am sure that there are exceptions (high performance cars) but I do know that all Quadrajets are not the same CFM. http://www.hemmings.com/index.cfm/fu...article_id/498



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