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Porsche Piston and Cylinder Set - 86mm - 2.2/2.4 911S 69-73 0336611006--BLK Are you looking for aPorsche 86mm piston and cylinder kit for 911S models (1969 1973) with a 2. 2 or 2. 4L engine. These pistons are high domed and high compression with tops that measure 11mm and a compression height of 34. 2mm. The cylinder barrels are aluminum with a cast iron sleeve and finished on a Sunnen CNC honing machine. The compression ratio needed is 9. 1: 1 and 9. 7: 1.