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...or you could just fit an Alusil dry sleeve in your damaged bore, hone it to tolerance group 1 and reuse your existing piston.
Also how deep are those marks? If you weren’t having issues before then it’s likely they’ll be fine. Possibly caused by a damaged ring, replace ring and leave it at that is another option.
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Mike A
9TECHNIK | TRANSAXLE ÄRA
1986 944 (Street); 1986 944 (Track); 1986 951; 1989 951 (3.0L 8V); 2000 996 Cab.
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