Cylinder Works Big Bore Cylinder. O.E.M. in appearance, but a fraction of the price. Increases horsepower and engine displacement. Power increase throughout the entire RPM range. New cast aluminum. Nickel silicon carbide (NSC) electroplate bore which allows for tighter tolerances, lower friction, and extreme durability. True bolt-on application without further modifications. Note: Cylinder ONLY for some kits (can be used with Vertex piston) unless noted. Why Cylinder Works uses nickel silicon carbide plating.