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Been searching the forum for ideas on my current problem. Final stages of complete restorations of my 73 Z. My latest issue is it running rich. I have replaced the 73 carbs with 72 round tops that I completely rebuilt. The car runs fines at all rpms and speeds (actual driving it). It smells rich and does some popping thru the exhaust. I should also mention I have headers on the car. The carbs have new .100 nozzles from z therapy and N54 needles. In an attempt to lean it out I've tried incrementally adjusting the Idle nuts 1/2 turn clockwise (did it 2 times 1/4 turn at a time). According to the 72 FSM says turning the idle adjustment nut clockwise reduces fuel and turning it counterclockwise increases fuel delivery. I assume if I'm reducing fuel, I'm leaning it out. However, when I went for 1/4 turn cw to 1/2 turn, it seemed to get richer. Is the FSM correct? I know I've found other errors in the FSM before. When I originally rebuilt the carbs I set the nozzle depth at 2.2mm as recommended by the FSM. How else can I lean it out? Am I on the right track? Like I said it's running well except for the rich smell and popping thru the exhaust.
