I recently put an 82 or earlier 4 bbl intake from a 4.1 on my 86 231. The computer was making the car stupid so I eliminated it. I put a Quadrajet on it. The carb is from a 73 Pontiac. I think the jets are about 72 I forget what the primary rods are, though. Anyway, I get a bog when I first hit the throttle. After the little stumble it will pull hard and everything is fine. The accelerator pump is reletively new and has a good seal. The spring is rather narrow and has alot of coils. The accelerator pump spring in the original 2bbl carb is thicker with half as many coils. Could the accelerator pump spring be my problem??? I wanted to ask before I start messing with it and make it worse.
I did a similar swap years ago with an '82 Regal. I used a computer Q-Jet from an Olds 307, but I swapped the primary jets and mixture control solenoid rods from my Computer controlled Dual Jet to the Q-Jet. It worked great. Then I just tinkered with the spring tension for the air valve on the secondaries. Mark
I put the other spring in tonight. It runs terrific (for a 231). From what I can tell, the spring with more coils was limiting the pump travel, thus limiting the fuel charge. When I was testing it earlier I was running around without the aircleaner. It still had a full throttle stumble, but the off idle acceleration stumble was gone. I put the air cleaner on and that problem went away. My jets are 74 and the primary rods are 47. I'm thinking about leaning it out some. On hand (without tearing another carb apart) I have a set of 70 and 73 jets. My primary rods I have are 40, 43b and 46c. Maybe I'll just leave it alone cause it runs well right now.
The main curcuit air bleeds could be too big. Consider working on them too. If they are too big it will change the fuel curve and bring the fuel in late. Lean at lower rpms, rich at higher rpms, and will not be as responsive as it should be or stumble/bog easy.
