The type of carb you run plays a major part in the timing. Stock or modified Honda carbs limit the timing advance significantly. Weber or Holley type carbs (all types) allow for much greater timing advancing. There is a noticable horsepower gain with a Weber carb, but the trade off is in drivability. Plus the Webers can be a real pain to jet for different weather/altitudes.

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Chris Harris
ITC Honda Civic