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I'm not measuring it at 186, but that is the psi that a new NA will make. What I dont understand is how could it possibly be 186psi if it is only 10.5:1 compression ratio. The compression ratio would have to be 12.65:1 for it to have 186psi. What am I missing? : heads over time, compression increases as a result of the decreased combustion volume. This could account for your high PSI rating.
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