Eagle B12304040 Competition Balanced Rotating Assembly - Small Block Chevy 4.040" Bore

The Eagle B12304040 is a Competition-level balanced rotating assembly designed for high-performance Small Block Chevy V8 engines with a 4.040" bore (.040" overbore). This complete rotating assembly delivers exceptional strength and reliability for demanding applications, making it ideal for engines producing over 500 horsepower.

Key Features:

• Forged 4340 steel crankshaft with .125" fillet radiuses for maximum strength
• Eagle H-Beam connecting rods with ARP 2000 or L19 fasteners
• Premium forged pistons from leading manufacturers (Arias, JE, or SRP)
• Plasma-moly file-fit piston rings for superior sealing
• High-performance Clevite 77 "H" series rod and main bearings
• Factory balanced assembly - ready to install with no additional balancing required
• Designed for internal balance configuration

Eagle Competition rotating assemblies are engineered for serious performance builds, race applications, and forced induction setups. Each component is precision-matched and weight-balanced to exacting tolerances, ensuring smooth operation and long-term durability under extreme conditions. The forged 4340 steel crankshaft provides the ultimate strength for high-RPM operation, while the H-Beam rods offer an excellent strength-to-weight ratio.