General Category > Quadrajet Carb Talk and Tips
Is there a difference performance wise?
55 Tony:
Which one of these q-jets are better performance wise or is there no real difference? No need to match numbers or anything like that.
7042240 or a 17084266 (both 800cfm)
Engine is a 454 ~10.3:1 compression
Cam:
http://www.compcams.com/Company/CC/cam-specs/Details.aspx?csid=436&sb=0
I have always had trouble with fuel starvation when it's hot and going WOT. I'm guessing I get fuel vapor in my lines and the pump can't keep up pushing the vapor out and pumping fuel again?
The 17084266 is new to me. It has the large void shown on page 12 of Cliffs book, but it didn't come with the plastic cup. It looks to me as if I could drill a hole down near the bottom of that void that it would basically make the bowl larger/more capacity. Anyone try that?
carmantx:
I can't find any info on the 4266, but it is probably electric choke.
So choke would be a difference to consider.
Also consider the internal APT for tuning on one, not other
2240 will have more parts selection for rods.
Just some thoughts to consider.
Cliff Ruggles:
17084266?
Not familiar with that part number, can you post a pic of it?
55 Tony:
I goofed, it's a 17084226.
Cliff Ruggles:
Late model truck Q-jet, nice unit and same capabilities as the early Buick but a much better carb all the way around....IMHO
"I have always had trouble with fuel starvation when it's hot and going WOT. I'm guessing I get fuel vapor in my lines and the pump can't keep up pushing the vapor out and pumping fuel again?"
Start by putting the correct high flow N/S assembly in the carburetor to make sure it isn't simply a fuel delivery issue. I would install our HP pump at the same time, the big block application needs both of those items...
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