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[72 240z] Ignition Timing / Carb Tuning in 2021...

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Good evening all, 


I got some beautiful carbs from ZTherapy around the middle of last year, and I'm having a hard time getting my idle down.


I know that carbs are supposed to be the last thing that you tune, but how do I set the ignition timing is right when I can't get the idle under 2500 RPM? 


Looking for some advice. Here is some other info/things I've done so far:

  • Checked for vacuum leaks with carb cleaner just about every time I turn the car on to warm up
  • Replaced PCV valve
  • Head is rebuilt, had to shave it down a little bit due to a blown head gasket from the previous owner
  • Checked valve lash with feeler gauges (cold set and then hot check)
  • Checked Head Bolt torque to ensure that's not an issue
  • Dry compression test, all cylinders between 135 and 140 except #6 which was about 130
    • Will do a wet compression test tomorrow


What would your next steps be?





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