This Sealed Power 4663M Main Bearing Set features a steel-backed bronze alloy lining with an overplate, known for its fatigue resistance and strength, providing the conformability required for older applications. It is designed for use with E-356K, E-356KC, or E-356X ring sets and 350 crank without the need to rebalance the engine. The set meets or exceeds OEM specifications, ensuring top quality and durability. The exacting tolerances provide a precise fit. The item weighs 0.25 pounds and has dimensions of 3.88 x 6.19 x 2.13 inches, making it suitable for specific engine requirements.