Manifold Vacuum Advance what am I not getting?

340inabbody said

Thanks I guess I don’t know how to tune for best idle. That’s why I’m here to learn. I am currently using Autolite 63 I came down from the 65’s as part of the recipe for helping with detonation (along with a slower curve).

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Because Autolite thinks it’s plugs are super plugs and one range fits 3 ranges in other plugs I can’t tell exactly what that plug is.

It’s either a 9 or a 12 in Champion.

A 12 is at least 2 ranges too hot for that cranking compression.

I also don’t use plugs with a black shell. You need to see color changes on the shell and black plugs don’t do that very well.