High Quality Harley Davidson Replacement Engine Motor Cylinders for Vintage Motorcycles. Fine Cast Iron Cylinders are Furnished in a "Finished" version, Bored to Standard, and painted black. If you are rebuilding a vintage Harley Big Twin (Panhead, Knucklehead, Shovelhead,WL WLA WLC 45 FLATHEAD EL FL FLH FXE) or an IronHead XL Sportster, here is your opportunity to get a great set of engine cylinders for your antique Harley at a very fair price. We also sell STD or Standard pistons in our Superior Engine/motor section that you may mate up to these cylinders with rings, wrist pins, & locks for easy installation. When installing pistons in the cylinders it is suggested that you hone the cylinder prior to installation.