Thats a standard '76 Mahle Nikasil cyl,
6 in the triangle is the height group 85.425 - 85.450mm
0 is the cyl. bore group 90.000 - 90.010mm
the pistons look like std 8.5 forged Mahle 2.7 for nikisil cyls used in the 911 and 911S in '76
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the numbers stamped on the ends are 91114100 and 91114200
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std 2.7 cams used for 911/911S in '76
the heads appear to be std '76 fare, w/ 35/35 mm ports