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Like I said, vacuum advance is irrelevent to output, perhaps you misunderstood. If you look at the factory figures and compare them to the advances curves you will see your error. What I am saying is true all the way out to the 10.3:1 Carrera. Compression was increased and timing kept sub optimal to meet efficiency goals within the limit of the fuel spec.
You cannot understand this without looking at the actual data. You can find it by combining the factory manual, spec book, and the factory sales literature for each production change.
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Paul
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