Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

7041540 Buick 455 goes lean at WOT

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quadrajam:
Time to focus in on the secondary set-up.

QJ

Rhett:
Given fuel wont make it in the front door, adjusting the back door seems a little premature?

Rhett:
I've been thinking about trying a 540 carb with no primary rods, and wanted to see if the group had any suggestions on set up:
-Upper and lower air bleed sizing
- OK to eave the primary piston in place? (this is a trial set up, I dont want to solder a good core shut)
- Primary Jet sizing
- Bypass sizing - this car loves a huge bypass

Anything else I need to consider? this is on a 440/540 Buick 462 stocker, 5700 rpm max, 3.73 gear and 3000 stall, 4000 lbs. Will I lose day to day driveability?

Kenth:
I would leave the main airbleeds std.
Power piston left in the hole w/o spring.
Use Rochester 2G .065"-.067" jets w/60° approach (short taper).
.110" to .138" idle bypass air.
If more needed for correct position of throttle blades to off-idle slots, holes of proper size may be drilled 1/4" from front edge of throttle blades.
This wont lean WOT mixture as larger holes in throttle plate will.

HTH

lightning boy:
Just a thought Rhett, have you checked the secondary tubes in the airhorn? Sometimes they're pressed it too far blocking some flow.

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