King Engine Bearings Main Bearing Set Bi-Metal Silicon Aluminum

King Engine Bearings SI-Series main bearing sets (also called crankshaft main bearings) are bi-metal engine bearings made from lead-free silicon aluminum. They are intended for OE-style replacement, engine rebuilding, and performance engines that keep a factory crankshaft.

Key Features:

• Bi-metal silicon aluminum construction: The aluminum-based lining is strengthened with about 2.5-3% silicon. It suits low- to medium-load engines and engines with nodular cast iron crankshafts.
• Lead-free material: The bearing material contains no lead.
• Improved oil clearance: The design helps reduce wear and extend engine life. It also helps lower operating noise, vibration, and excess oil flow.
• Improved crankshaft finish: The bearing surface helps reduce microscopic ferrite peaks on improperly ground or polished nodular cast iron crankshafts.
• Suited to gasoline and diesel rebuilds: They work as direct replacement bearings for aftermarket engine rebuilding.

King Engine Bearings was founded in 1960. The company builds bearings for automotive, truck, marine, aviation, and standby power engines. Choose the specific part number that matches your engine and crankshaft journal size.