Eagle B13160040 Balanced Rotating Assembly Small Block Chevy Stroke Bore - 409ci 3.750 4.165

The Eagle B13160040 is a complete balanced rotating assembly designed for small block Chevy engines with a 409 cubic inch displacement. This street and strip assembly is engineered to provide reliable performance for engines producing up to 500 horsepower, making it an excellent choice for performance street builds and weekend racing applications.

Complete Assembly Includes:

• Eagle cast steel crankshaft with 3.750" stroke and .092" fillet radiuses for improved strength
• Eagle SIR (Super I-beam Rod) forged 5140 steel I-beam connecting rods, 5.700" center-to-center length
• Upgraded 3/8" ARP 8740 chromoly cap screw rod bolts for superior clamping force
• Forged 4032 aluminum Icon pistons with -23cc inverted dome design, 4.165" bore
• Premium piston rings with plasma-moly coating
• Performance rod and main bearings

Key Features:

• Factory balanced by Eagle - ready to install with no additional balancing required
• Designed for internal balance configuration without heavy metal
• High-quality forged pistons provide durability under high cylinder pressures
• Cast steel crankshaft offers excellent strength-to-cost ratio for street performance
• ARP fasteners ensure reliable connection under demanding conditions

This rotating assembly is ideal for builders looking to create a strong, reliable 409 cubic inch small block Chevy engine for street performance, bracket racing, or muscle car restoration projects. All components are precision-matched and balanced as a complete assembly for hassle-free installation.