Eagle B20301060 Big Block Chevy Rotating Assembly - 496 Kit

The Eagle B20301060 is a balanced rotating assembly kit designed for building a 496 cubic inch big block Chevrolet engine. This street and strip performance assembly is engineered for engines producing up to 700 horsepower and provides an excellent combination of affordability, reliability, and performance.

Complete Assembly Includes:

• Eagle cast steel crankshaft with 4.250" stroke
• Eagle SIR (Super I-Beam Rod) forged steel connecting rods with 6.385" center-to-center length
• ARP 8740 fasteners for superior clamping force
• Forged aluminum pistons optimized for performance
• Plasma-moly file-fit piston rings
• Rod and main bearings

Key Specifications:

• Displacement: 496 cubic inches at 4.310" bore (.060" oversize from 4.250" standard bore)
• Stroke: 4.250"
• Rod Length: 6.385"
• Balance: Pre-balanced by Eagle - ready to install with no additional balancing required
• Application: 1991-up Chevrolet 454 big block Mark IV engines with 2-piece rear main seal
• External balance design

This rotating assembly is ideal for street performance, street/strip applications, muscle cars, hot rods, and performance trucks. The part number beginning with "B" indicates this kit has been precision balanced at the factory, eliminating the need for additional machine shop balancing work.