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S&S Cycle 106-5520 Forged Piston Kit (80ci.) - .010 Oversize, 8.75:1 High Compression drive-hubs 1997-1998 Arctic Cat EXT 580Replacement pistons available for stock 74in., 80in. and 35 8in. big bore applications. All pistons kits come with two pistons, rings, wrist pins, and wrist pin keepers. Compression ratios listed are approximate and are calculated using the correct length cylinders as specified by S&S. Requires the use of connecting rods with a rod length of 7. 440in.(standard length OEM #24281 74A connecting rods); use of earlier connecting rods with a rod length of