Can you guys help me figure out my Compression ratio

i should add that on the few nitrous engines i built, i ran them a little cooler and put slightly cool spark plugs in them to reduce the potential for detonation . i also ran high voltage ignitions with minimal plug gaps like around .026" to .028".

i should also add that i am far from a nitrous expert, however, what i do is similar to what other people i know that run nitrous do and it works for my apps.
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By all means thanks for the feedback. What band and how cold of a plug did you run.