Cameo Ivory 1967
Ive always (for decades) kept my AFR's on the lean side (as you may or may not recall). But the manual trans exploited it, so I did bump up two stages richer, earlier in the week, but then the new exhause went on, so I'll pay close attention to the AFR's.I think you are a bit lean lean Army. Yes rich can do it also. But lean is more common. At cruise with a light pedal you are getting a lot of timing which you need to burn the lean cruise mixture. But yours may be a tad too lean for your setup.
when you slowly push the clutch down you also slowly “Decrease the load” on the engine by letting your foot off the gas pedal. Youkinda work those feet at the same speed. When you clutch easy your foot comes up easy andwhen you shift hard your foot comes up fast.
So depending on the speed where this happens an enrichment of that carb circuit may be called for.
say at 3000 Rpm you are at 60 mph light throttle. That will be on your main jets and idle circuit. ( because idle circuit never really stops, it is just overdone by th email jets.
then I would increase the main jets two sizes and see if the after fire changes.…then see what the AFR is if it is gone.
It's definitely in the 13's, but it has four mufflers now. I also am battling a s slight header gasket leak, at the head... so lean would make sense.