Clevite Case 251 267 284 301 336 Series 4 Cyl Main Bearing Set

This is a Clevite main bearing set, part number MS1497P10, designed for 4-cylinder engines in the 251, 267, 284, 301, and 336 series. Main bearings are critical components that support the crankshaft within the engine block, allowing it to rotate smoothly while handling significant loads. When rebuilding or repairing an engine, replacing these bearings is often a necessary step to ensure proper oil clearance and reduce friction.

This particular set from Clevite is manufactured to be 0.010 inch undersize. This sizing is important when the crankshaft journals have been machined down during a rebuild to correct imperfections or to achieve a specific clearance. Clevite is a well-known name in engine bearings, recognized for producing durable parts that meet the demands of engine operation. Installing these bearings correctly with the proper oil clearance is key to a healthy, long-lasting engine.