517943 Flywheel thrust washers, steel (0.55" thick)

These steel flywheel thrust washers are designed for vintage Big Twin and Flathead bottom ends. With a thickness of 0.55 inches, they are intended for use with steel retainers and sit between the connecting rods and flywheels to maintain proper side clearance. They are a direct replacement for OEM 23972-36, also referenced as 372-36, and are sold as a pair. Fitment includes 1936 to 1941 61-inch Knuckleheads, 1948 to 1952 61-inch Panheads, and 1937 to 1948 74-inch and 80-inch Flathead models. For the serious restorer, these washers provide the precision needed to bring a classic engine back to factory tolerances, ensuring a smooth and durable rotating assembly.