Piston +.030 / Briggs & Stratton 498587Pack Size:1Briggs & Stratton 394958, Briggs & Stratton 394664, Briggs & Stratton 391289, Briggs & Stratton 499294, Briggs & Stratton 498587, Briggs & Stratton 499959ESF 163-153, Foley/Belsaw 5978376, Foley/PLP 163-153, Laser L5636, Laser L5648, Laser 94237, Oregon 36-315, Oregon 36-218, Prime Line 7-03518, Prime Line 7-03879, Rotary 6727, Sunbelt SB-6727Briggs & Stratton 220000-222000, 252000-257000, 280000-286000 and 400000-422000Ethanol: Not compatible with greater than 10% ethanol fuel, Cylinder Bore Size: 3.4665"-3.4675"