Piston Ring +.030 / Briggs & Stratton 391783Pack Size:1Briggs & Stratton 391783, Briggs & Stratton 394962, Briggs & Stratton 394783ESF 163-067, Foley/Belsaw 5978229, Foley/PLP 163-067, Green Meadow RO18, Laser L5498, Laser 94129, Oregon 36-018, Prime Line 7-03731, Rotary 6774, Sunbelt SB-6774Briggs & Stratton 220400-222400, 252400-257400, 28A700-28D700, 280700-286700, 400400, 402400-404700 and 42A700-460700Cylinder Diameter: 3.4675 ", Ethanol: Not compatible with greater than 10% ethanol fuel