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Sorry, I meant Nitrogen Oxide, good catch. I do agree with consumption decrease with the increase in compression, but it was not the driving force behind the changes. You have to look at ALL the changes implemented, not solely on a compression bump. There were BIG changes in camshafts profiles and exhaust backpressure when this all took place.
Depending on the size of the chamber, a Hemi head can require more than 40 degress of advance
The 25 degree spec is mechanical advance only. It does not include the vac advance which put the timing higher. I do not have the spec on me but about 10 deg of vac advance IIRC. There were a large variety of vac advance units placed on the 3.0 liter SC.
EDIT; The original post is....which is better, full advance or higher comp? The changes made to the CIS cars for emissions/cafe only apply if the cars are in a stock configuration.
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Aaron.  F.S. 1965 Solex engine w carbs/cleaner
Burnham Performance
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Last edited by BURN-BROS; 03-20-2010 at 10:29 AM..
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