I'm running 10.2:1 compression. Honestly I wish I were running higher. 11:1 or even 11.5:1 would be fine with the boost I can get from the blower on my setup, but at the time I bought the pistons I was in a time crunch and had limited options. I also chose to run lower compression than the max possible for safety's sake, knowing that I would be sacrificing some power potential.
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