... ,Clean and Good heat dissipation.◊. Clear bore surface cross hatch patten,Good Oil-retaining characteristic, Resulting great increase ... and smooth scavenge ports and fine ◊. Clear bore surface cross hatch pattern and nice oil-retaining characteristic ◊. Resulting great ... smooth scavenge ports and fine ◊. Clear bore surface cross hatch pattern and nice oil-retaining characteristic ◊. Resulting great ...