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I'm not a gear head but when I was modifying my last car I had to advance my timing 3 degrees because I planned to run 91 octane. I did that because I ran nitrous, it needs higher octane. I of course retarded the timing 6 degrees when I sprayed. The point where I'm getting is a measily 2-3 degree advance is not going to make any significant low end power. When I advanced the timing 6-7 degrees by accident I had significant improvement in my bottom end power.
If I was going to play with the engine to improve my FE it would be a cam. Even as far as getting a custom cam then playing with the timing.
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