HARLEY Knucklehead Engine Case Set Fits 1937-1947 EL, 1941-1947 FL,

2023 New Production motor case set features a blank number boss there are no serial numbers on the case. Sold with Bill of Sale only. Includes the welch plug and the right and left case races installed as original! 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 required line lapping of the main case races. Case set is designed for replacement of the original cases. Case sets do not include pinion and sprocket shaft races. *NOTE: Case races should be line bored to 1.500 inch to accept standard rollers. 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. *NOTE: Must order the following required components separately: cam distributor gear breather gear pump and bushing. FITS HARLEY: 1937-1947 EL, 1941-1947 FL,