Kit includes standard flywheel assembly, 3.625'' Sidewinder® stroker big bore cylinder, 9.75:1 compression ratio pistons, rings and gasketsFlywheel assembly is complete with S&S heavy duty connecting rods and mainshafts, head gaskets, base gaskets, and exhaust gasketsMakes stock 80'' displacement into 96'' displacementMade In the USADoes not include manifold, pushrods, or pushrod clips.'77-'89 style pinion gear and oil pump drive gears must be used when installing S&S flywheels in '90-'99 engines.Cases must be bored to accept 3.625'' bore cylinders, and a minor crankcase clearancing operation for the crankpin nut must be performed.