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Danny Ashley · 12-17-2009, 10:02 PM

Jeff:
All Q-Jets were 750CFM (1.093 venturi) until 1971 when the 800's (1.218 venturi) were installed on Buicks. Pontiac got their's in 1973, Olds 1975, and Chevy also 1975. Not sure about Caddy's. The single booster were on Pontiacs in 1971. I have heard that they were on a few late 1970 and early 1972's. The 7041263 was used on low performance 400's and I think 455's. These carburetors venturi measures 1.093. I had one flowed and was told it flowed inbetween a 750 and a 800. The Pontiac community always refer to these as an 800. Is there an advantage to these over an 750? NHRA thinks so because they say they are only legal on the engines they came on. Danny

12-17-2009, 10:02 PM	#17
Danny Ashley Member Join Date: Nov 2001 Location: Marion,In. Posts: 267 Likes: 60 Liked 110 Times in 29 Posts	Re: Thermoquad vs Quadrajet Jeff: All Q-Jets were 750CFM (1.093 venturi) until 1971 when the 800's (1.218 venturi) were installed on Buicks. Pontiac got their's in 1973, Olds 1975, and Chevy also 1975. Not sure about Caddy's. The single booster were on Pontiacs in 1971. I have heard that they were on a few late 1970 and early 1972's. The 7041263 was used on low performance 400's and I think 455's. These carburetors venturi measures 1.093. I had one flowed and was told it flowed inbetween a 750 and a 800. The Pontiac community always refer to these as an 800. Is there an advantage to these over an 750? NHRA thinks so because they say they are only legal on the engines they came on. Danny