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The number you need to use depends on the cam you are using and the model year of engine. My data from Elgin indicates the following:
930 turbo cams for 1978-1981 .65mm-.80mm,
SC cams had 3 different settings thoughout the years even though the cams are the same. .9mm-.11mm, 1.1mm-1.4mm, or 1.4mm-1.7mm.
Tell us the year motor, type of cam and port size and maybe we can give more guidance.
-Andy
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72 Carrera RS replica, Spec 911 racer
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