Eagle B11421L Big Block Chevy 496 Balanced Pro Competition Rotating Assembly

The Eagle B11421L is a balanced Pro Competition rotating assembly designed for Big Block Chevy 496 cubic inch engine builds. This complete assembly is engineered to support high-performance applications up to 1200+ horsepower and features premium components throughout.

Key Components:

• Eagle 4340 forged steel crankshaft with 4.250" stroke and 1-piece rear main seal
• Eagle 4340 forged steel H-Beam connecting rods with 6.385" length and 7/16" ARP 8740 rod bolts
• 4032 forged Icon dome pistons (+23cc) with performance ring set
• High-performance rod and main bearings included
• Factory balanced assembly - ready to install without additional balancing

Specifications:

• Displacement: 496 cubic inches
• Stroke: 4.250 inches
• Rod Length: 6.385 inches
• Compression Ratio: 10.8:1 with 112cc chambers, 10.3:1 with 118cc chambers, 9.8:1 with 124cc chambers
• Fits Gen VI short deck (9.800") blocks with 1-piece rear seal

The "B" prefix indicates this assembly is internally balanced by Eagle, eliminating the need for additional machine shop balancing work. This Pro Competition series kit uses upgraded ARP 8740 rod bolts, making it suitable for racing applications including nitrous oxide and forced induction systems.