S&S CYCLE - CYLINDER & PISTON KIT - 80" - EVOLUTION BIG TWIN - NATURALCylinder & Piston Kit 80" Evolution Big Twin Natural Highlights Cylinder and piston kits contain S&S 3 1 2" bore (80") cylinders and forged pistons, rings, wrist pins, and head and base gaskets The pistons included are flat topped forged pistons designed to be used with either stock cylinder heads or with S&S Performance Replacement heads (8. 8: 1 compression ratio) Made In the U. S. A. + Fitment 1984 1998 Harley Davidson Electra Glide Police FLHTP