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The haynes Manual lists 142psi-156psi as normal for all engines, Ussualy in general just so long as two cylinders are not past 15-20 psi of each other your good.
compression ratio is really just a way to express the amount of air in the cylinder when the piston is at bottom dead center to the amount of air in the cylinder with the piston at top dead center. When air leaks out for whatever reason (i.e. bad piston ring or whatever), that ratio decreases. However, tight fitting seals and rings yield the highest compression available with whatever pistons and head you have on there
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