518001 Sprocket shaft crankcase bushing. +.002"

Rebuilding the bottom end of a 1939 to 1973 45-inch (750cc) Flathead requires high-precision components like this sprocket shaft crankcase bushing. This is the left-side crankcase bearing race, and it is oversized by .002 inches to accommodate cases that have been slightly machined or worn over decades of use. The standard outer diameter for this part is 1.753 inches. Carrying OEM part numbers 24611-39 and 518001, this bushing is critical for ensuring proper shaft alignment and bearing support. It is a vital part for any serious engine builder looking to restore a vintage Flathead to its original operating specifications.