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1976 Rochester Q-Jet Identification
I have a Rochester Q-Jet that is for a 1976 Cadillac 500CID. Done a little research and still question whether Cadillac only used 800 CFM on this year. Clearly, it's marked for the 76' year, federal emissions, auto., and yet, when I look down into the primary bores I can see that it has a raised annular ring, which I've read indicates a 750 CFM. The Carb. Ident # 17056230.
posted: August 15, 2009
  Answers (4)
What's the 4 digit number under the GM number? That's called the list # If I have that I can check my Hollander manual and see if it is the origninal for sure and also can call my buddy who runs a crab rebuild shop and get specs on it.
posted:  August 16, 2009
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Looks to me to read 0826 or D826 under the carb #
posted:  August 16, 2009
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It's 0-8-2-6
posted:  August 16, 2009
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Ok-- finally caught up with my friend who runs the carb shop. According to him, GM never rated CFM of Quadrajets. The number you gave me identifies it as a '76 Cad carb on a 500 cubic inch engine. He said the base needs to be taken off, and the ones that flow more the bores will be more of a round shape than oval. However, as he pointed out, when you have that many cubic inches (500) sucking air, it will definitely pull more air than if it was on, say, 327 or 350 cubic inches. Some of the Cad carbs according to him would pull up to 800+ CFM. Hope this helps.
posted:  August 19, 2009
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