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If it was pure ethanol, perhaps 16:1 or more, but I'd rather be conservative and sneak up on the compression, based on experience, than regret going too high. I decided 13:1 was high enough to show a difference. Remember, this also is with cast iron heads, which are less detonation resistant than aluminum. Another factor to consider is dynamic vs. static compression. On the contrary, the cam might have lowered the dynamic to the point that efficiency will suffer and maybe I could have gotten away with a higher CR. The dyno session and subsequent testing will give us hard data...
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