Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem
Chasing lean condition at WOT
baxternick:
The engine always had a small bog when I floored it and would go stupid rich no matter what hanger I used when under 3k rpm. Then once I broke the 4K rpm the engine started to lean out bad. I would see no change in performance once I got through the initial bog. The engine would pull strong even when that lean at WOT. I was just concerned about engine damage with it that lean. I just installed 77 jets with 53M rods. This is close to the same cruise area I had before, but a good amount more at wot on primaries. This allowed me to tone back secondaries to a M hanger that stopped the bog. First drive today was good. Air fuel at cruise is 13.3-13.5. WOT is now 13.2 at most.
Jeffs68:
Nice! Looks like you got the right combination!
Cliff Ruggles:
Large MAB carburetors never used "M" series metering rods, and stock 350 SBC low compression smog engines with crappy 882 heads on them used 76 or 77 jets and "K" series metering rods with .026" tips......FWIW.......Cliff
Marx3:
So if this is indeed a large mab unit, then the calibration is just even worse for a big Cadillac 500 !
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