Is my 340 Overcarbed? Avg 5-6 MPG

Thanks Rob!

I put a 2" open spacer on it. I am going on det again so I will do some more fine tuning once I get back home.

Ken

Awesome I'm glad it worked out too I had my doubts obviously this combo isn't exactly working in your favor... What are your WOT A/F numbers now? I agree with madmoparmick you need to keep the cruise ratio where it is or lean it a bit with jetting (primary) then get it fatter at WOT with more PVCR size and secondary jetting to match.

BTW the part-throttle ratio getting richer at upper RPMs is fine it won't really affect anything anyway as you are hopefully not cruising any higher than 3000.