King Engine Bearings CR642SI020 SI-Series Connecting Rod Bearing Set - .020 Undersize, Ford V6 2.8L / 4.0L

This set is ground to a .020-inch crankshaft undersize, making it the correct choice when journals have been machined to restore proper geometry and surface finish.

King's SI-Series silicon aluminum bi-metal construction features an aluminum-based alloy strengthened with 2.5–3% silicon, bonded to a high-strength steel backing. This material composition is specifically formulated for medium-load engines and engines equipped with nodular cast iron crankshafts, delivering excellent conformability and wear resistance throughout the bearing's service life.

Key Features:

• SI-Series bi-metal construction — silicon aluminum alloy over steel backing for medium-load durability
• .020-inch crankshaft undersize — designed for use with journals machined 0.020" under standard size
• Improved surface finish — reduces microscopic ferrite peaks common on improperly ground or polished nodular cast iron crankshafts
• Optimized oil clearance — helps reduce wear, engine noise, vibration, and excess oil consumption
• Bull's Eye Tolerance™ technology — King's proprietary manufacturing process combining precision machining, overplating, and real-time computerized wall thickness monitoring

King Engine Bearings has specialized exclusively in engine bearings since 1960, supplying the automotive, aviation, marine, and motorsport industries. The CR642SI020 is a direct-replacement part suited for OE-spec engine rebuilds and aftermarket performance applications using stock crankshafts.