General Category > Quadrajet Carb Talk and Tips
Largest N/S you've used?
77cruiser:
So what's the largest you've used with out problems, at say 6 psi?
Right now I'm at .141 @ psi. I just installed an electric in tank pump 320 lph or 80+ gph.
I'm still getting some lean out at the top of gears.
Combo is 421 sbc 530 ish hp 6000 rpm.
Frank400:
Just built a 800 cfm for a friend with a 625 hp or so 434 and he's doing fine with .135". He's running an aeromotive A1000 at 5.5 psi. No leaning out on top end.
I was almost certain he would need a .150" and looks like it won't be needed.
What is your fuel system ?
77cruiser:
AEM 320 lph pump Aeromotive reg.
https://www.summitracing.com/parts/avm-50-1000
https://www.summitracing.com/parts/aei-13301
77cruiser:
--- Quote from: Frank400 on September 05, 2017, 06:38:42 PM ---Just built a 800 cfm for a friend with a 625 hp or so 434 and he's doing fine with .135". He's running an aeromotive A1000 at 5.5 psi. No leaning out on top end.
I was almost certain he would need a .150" and looks like it won't be needed.
--- End quote ---
Is the engine in the car? Does he have an AFR gauge? Do you leave the round suffer in the carb?
Cliff Ruggles:
I made a .160" for a customer running a FAST Class car once.
I use a .145" seat at 7.5 psi my own carb, but it works equally a well with a .135" seat as long as I keep the fuel pressure at least 6 psi......Cliff
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