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Tony is right. The 80-83 SC uses a more advanced cam setting. It provides more torque and is more compatable with the smaller intake ports (35mm). I believe the setting is 1.4 to 1.6mm. There is a possiblility that the Euro SC for those years had bigger ports (39mm). In that case the 1mm setting would be better.
-Andy
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72 Carrera RS replica, Spec 911 racer
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