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According to Bruce Andersons book the deck height of 911 engines is .030 to .040 and the minimum clearance from piston to cylinder head should be .039 inches. These two measurments can be different due to the shape of the pistons and heads. I have found the deck height ranges because the piston slops slightly in the bore. I think your readings look good provided the piston dome doesn't slope up to quickly and get too close to the head "squish" area.
-Andy
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72 Carrera RS replica, Spec 911 racer
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