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Author Topic:   Quadrajet Carb Question
Dirt Full Roller

Total posts: 47
posted July 19, 2005 04:19 AM  
Is there some Q-jet that are better for racing than others. I see some have front gas inlet and some have side gas inlet. Some even have different tops. What do you look for to get a good circle track carb?

Dirt Maniac

Total posts: 148
posted July 20, 2005 02:45 PM  
I have heard the front inlet are better, although i've run both. I don't feel a big difference.
There are different Q-Jets but i think you'll be fine with any of the early plain 4 bbls. There are some that have electric connectors on some late 80s stuff. I shied away from them.
I run a q-Jet on my superstock against the high dollar Willies and BG carbs. I don't think my 50 dollar carb is giving anything away to those carbs.
Get the book on Rochester carbs, read it, make the modifications they suggest.
Address a post to KPLugnut, he'll square you away on any carb questions you have.

Some People Race For A Living; I Live To Race

Dirt Forum Champ
Total posts: 776
posted July 20, 2005 10:13 PM  
Get ones starting with a 704 serial number. stay away from the 170's

Dirt Full Roller

Total posts: 26
posted July 22, 2005 05:47 PM  
You need too get a Q-jet off of a caddy with a 435 or a 500 engine it has a biger CFM.

Dirt Maniac

Total posts: 176
posted July 22, 2005 06:57 PM  
What do you think KP? Is that true?

Dirt Forum Champ
Total posts: 1019
posted July 22, 2005 08:07 PM  
It's not mandatory to have the 800cfm big block quadrajet, as all the others flow 750cfm or thereabouts. When tuned right, every single quad will perform sufficiently except for the ones from the late 70's-early 80's that were from computer controlled engines as they require the computer to monitor enrichment circuits among other things.
750cfm is plenty for any engine in any class that allows these motors. Heck, we've got 700HP motors here in the northeast running on 650cfm Holley 4777's in nearly box stock form....

So, to answer the original question, nearly any early quad from a car or pickup prior to 1977 or so will be a good enough candidate for building into a race carb.



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