Piston +.020 / Kohler 47 874 14-SPack Size:1Gravely 041002, Kohler 47 874 14, Kohler 47 074 09, Kohler A-237404, Kohler 47 874 14-SESF 163-366, Foley/Belsaw 5979735, Foley/PLP 163-366, Green Meadow P366, Prime Line 7-03821, Rotary 6755, Sunbelt SB-6755Gravely K321 and M14 (old style); Kohler K321 and M14 (old style)Ethanol: Not compatible with greater than 10% ethanol fuel, Cylinder Bore Size: 3.520"