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Depending on year, the same camshafts were timed anywhere from.9mm to 1.7mm. Our experience with race engines using these cams indicate that timing towards the lower end will give you the most HP albeit at higher RPM. I would do what Porsche did and match the cam timing to the intake port. 34mm port go with 1.5, 39mm port go with 1.0 mm.
-Andy
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72 Carrera RS replica, Spec 911 racer
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