King Engine Bearings Ford 281 (O/D +.002 Mb5280Si) (Size +0.25mm) Main Bearing Set

King Engine Bearings is well-known for making solid engine components, and this main bearing set is a good example of their work. This particular set is designed for Ford 281 engines and comes in a +0.25mm size, often referred to as +.002 inches in older specs. Main bearings are critical for keeping your crankshaft spinning smoothly within the engine block, and using the right size is key to proper oil clearance and engine health.

This set uses King's SI material, which is a high-performance overlay that offers improved durability and reduced friction compared to standard bearings. The +0.25mm sizing means these bearings are slightly larger than stock, which is typically used when an engine's crankshaft journals have been machined down to clean up wear or damage. Ensuring you have the correct bearing size is essential for maintaining the proper oil film between the crankshaft and the bearing, which prevents metal-on-metal contact and premature wear.