Spark Plug

Newbomb Turk said

With your heads you should be able to get 40 or so degrees at a cruise. They probably won’t take much more than that because the chambers are very nice.

That would certainly help at a cruise.

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I am certainly not against increasing the cruise timing, but am very concerned about over-timing causing problems. As I've recently read (from another poster) someone ended up with engine damage from over-timing and he reported that he could not hear any detonation.