Eagle B11421L030 Competition Rotating Assembly 489 CID Big Block Chevy Balanced

The Eagle B11421L030 is a balanced competition rotating assembly designed for big block Chevrolet engines, delivering 489 cubic inches of displacement. This complete kit provides everything needed for a high-performance engine build capable of handling demanding racing and street/strip applications.

Key Components and Specifications:

• Forged 4340 steel crankshaft with 4.250-inch stroke for maximum strength and durability
• 6.385-inch H-beam connecting rods with 7/16-inch ARP 8740 bolts for superior reliability
• Forged 4032 aluminum ICON pistons with 23cc dome design at 4.280-inch bore
• Plasma-moly file-fit piston rings for optimal sealing and reduced friction
• King XP series rod and main bearings for enhanced lubrication and wear resistance
• Factory balanced assembly ready for installation

This competition-grade assembly features premium forged components throughout, providing the strength and reliability required for high-horsepower builds. The balanced assembly eliminates the need for additional machine shop balancing work, saving time and ensuring proper rotating assembly harmony right out of the box.