V-Twin Mfg. Cylinder And Piston Kit For Harley Evolution Cylinder And Piston Kit for Evolution 1340cc are honed and pre fitted with cast 8.5:1 pistons and rings. They are ready to run and will require break-in as suggested in the appropriate shop manual. Features Honed and pre-fitted with cast 8.5:1 pistons and rings Gaskets set sold separately Wrist Pin Length: 2.797 Pin Outer Diameter: 0.790 Pin Inner Diameter: 0.504 Gasket kit sold separately Install pistons with raised bars or on wrist pin area towards the sprocket shaft side of the engine