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PIston identification

Engine

Model: 911 S, Year:1968, Mileage:66000, Type of use:Street use only
I have an engine under rebuild that was unfortunately rebuilt before by a shop that used parts from other engines/years. The pistons have code 80P26E on them, everything I can find on the web says they are 69 911S pistons with 10.3:1 compression, but the Mahle aftermarket guide says they are 1967-1969 S pistons and 9.8:1 compression. I am trying to figure out if these are correct 1968 911 S pistons.

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