King Engine Bearings MB5219SI0.75 SI-Series Main Bearing Set Ford Oversize - 281 4.6L 0.75mm

The King Engine Bearings MB5219SI0.75 is an OE-replacement bi-metal main bearing set designed for the Ford 281 cubic inch (4.6L) V8 engine. This set includes 5 pairs of main bearings in a +0.75mm oversize dimension, making it the correct choice for engine blocks that have been align-bored or where crankshaft journals have been reground to the 0.75mm undersize specification.

SI-Series Bi-Metal Construction:

• Lead-free aluminum-silicon alloy — King's SI material blends aluminum with 2.5–3% silicon for excellent strength and durability
• Environmentally safe, lead-free composite material suitable for low- to heavy-load applications
• Particularly well-suited for medium-load engines using nodular cast iron crankshafts
• Ideal as a direct OE-replacement bearing for gasoline engine rebuilding
• Set includes 5 pairs of main bearings to complete a full engine rebuild
• Available in standard and multiple oversizes (STD, 0.25mm, 0.50mm, 0.75mm, 1.0mm)

King Engine Bearings has been manufacturing precision engine bearings since 1960, with every bearing produced under one roof using proprietary manufacturing machinery and rigorous multi-stage quality control checkpoints. The SI-Series is engineered to meet or exceed OEM specifications, providing reliable performance during engine rebuilds.