Main Bearing Set BBM 426/440

The Main Bearing Set BBM 426/440 by King Bearings is engineered for serious big-block Chrysler engine builders and performance enthusiasts running 426 or 440 cubic-inch platforms. These premium crankshaft bearings are essential when rebuilding, upgrading, or restoring high-performance big-block engines that demand reliable journal support under extreme combustion pressures. Whether you're assembling a stroker motor, replacing worn factory bearings, or pushing your classic muscle car to higher horsepower levels, this bearing set provides the precision fit and durability required for consistent engine longevity and reliable performance.

King Bearings are manufactured using advanced tri-metal construction that combines a steel backing with a lead-copper alloy and a thin overlay layer optimized for load capacity, conformability, and heat dissipation. This design reduces friction between the crankshaft journals and bearing surfaces while maintaining dimensional stability under sustained high-rpm operation and elevated engine temperatures. The Main Bearing Set BBM 426/440 features precision-ground bearing surfaces and strict tolerances that ensure proper oil film formation, critical for protecting your crank from wear and scuffing during hard acceleration, sustained highway runs, or track use.

This bearing set is ideal for engine machine shops, restoration specialists, and DIY builders who are serious about creating a bulletproof big-block foundation. Proper installation requires careful sizing, cleanliness during assembly, and correct torque specifications on the main bearing caps to achieve the precise clearances these bearings demand. Installation with quality engine oil, verification of crankshaft runout, and attention to bearing cap orientation ensures maximum service life and protection of your investment in a 426 or 440 engine build.