Knucklehead engine case set includes case bushings and stud set. Oil from top end returns through pushrod tubes. Does not return through cylinder base. Case accepts loose roller bearings on the sprocket and pinion shaft side. Case set is designed for replacement of the original cases. No serial numbers are provided with these case sets. A Bill of Sale will be issued for blank cases. Case set includes pinion and sprocket shaft races. Use 2 gaskets when mounting the oil pump body for proper clearance. **NOTE: Numeral inch7 inch stamped on rear motor mount halves to denote 74 cubic inch. Builder may stamp these numbers in. FITS 1941-1947 FL ACCESSORIES 10-0942 - 1936 61 inch Knucklehead Engine Case Set 49-0946 - 1941-1947 Knucklehead Left Engine Case Unmachined 10-0104 - Knucklehead Engine Case Set 10-1007 - V-Twin Stock Flywheel Assembly REPLACEMENT 8132-34 - Cadmium Stock Engine Case Bolt Kit 10-0240 - Jims Pinion Right Side Case Race Standard 10-0104 - Knucklehead Engine Case Set 10-0208 - Sprocket Left Side Case Race Standard