Eagle 357544625 Heavy Duty Rotating Assembly CID Chevy Big Block - 621

The Eagle 357544625 is a heavy-duty rotating assembly engineered for the most extreme competition engines including exotic fuels, heavy nitrous, and high boost applications. This complete 621 cubic inch displacement kit is designed for Chevrolet 502 tall deck (10.2" deck height) engines with 2-piece rear main seal.

Complete Assembly Includes:

• 4.625" stroke forged 4340 steel center-counterweighted crankshaft
• 6.800" H-beam connecting rods with 7/16" ARP L19 bolts
• JE forged 2618 aluminum pistons with 49cc domed tops, 4.625" bore
• .990" diameter piston pins with 1/16", 1/16", 3/16" ring pack
• Plasma-moly file-fit piston rings
• King XP performance rod and main bearings

Important Note: This assembly is unbalanced and must be balanced by a qualified machine shop before use. Harmonic damper and flexplate/flywheel are not included.

The forged 4340 crankshaft provides exceptional strength for high-horsepower applications, while the H-beam rods with ARP L19 bolts deliver superior durability under extreme cylinder pressures. The JE forged 2618 pistons are specifically designed to withstand the thermal stress of forced induction and nitrous oxide systems.