Eagle B357554625 Heavy Duty Rotating Assembly Kit 621 CID Chevrolet Big Block 502

The Eagle B357554625 Heavy Duty Rotating Assembly is engineered for extreme competition engines running exotic fuels, heavy nitrous applications, and high-boost forced induction setups. This complete balanced assembly is designed for Chevrolet 502 big block engines with 10.2-inch deck height and 2-piece rear main seal configuration, delivering a massive 621 cubic inch displacement.

Complete Assembly Includes:

• Balanced 4.625-inch stroke forged 4340 steel center-counterweighted crankshaft
• 6.800-inch forged H-beam connecting rods with 7/16-inch ARP L19 bolts
• Forged 2618 aluminum JE pistons with 46cc gas-ported dome design, 4.625-inch bore
• Plasma-moly file-fit piston rings
• King XP series performance rod and main bearings

This heavy-duty assembly features premium components throughout, including the robust forged 4340 crankshaft with center counterweights for improved strength and durability under extreme loads. The forged 2618 aluminum pistons are specifically designed to withstand high cylinder pressures from nitrous oxide or turbocharger/supercharger boost, while the gas-ported dome design optimizes combustion efficiency.

Key Features:

• Factory balanced assembly—ready to install
• Forged 4340 steel crankshaft for maximum strength
• Premium ARP L19 rod bolts for reliable fastening at high RPM
• King XP tri-metal performance bearings for extreme loads
• File-fit rings allow precise end-gap tuning
• Designed for racing and extreme street performance applications

Ideal for engine builders constructing high-performance Chevrolet 502 big block engines for drag racing, road racing, or extreme street applications where reliability under severe operating conditions is critical.