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The B16 and B18C5 heads are the same core. They have about .2 less CR than a C1 head in the same given application because there is more combustion chamber volume. Cams have nothing to do with the static compression ratio. Although, a longer duration cam such as the B16B cam (243 degree) will bleed off more compression at overlap than a cam with less such as a B16A or a B18C1 with 230 degrees. That is one reason that higher compression goes hand in hand with long duration cams. Effective CR varies under engine load and RPM.
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