Eagle 42101040 Big Block Chevy Rotating Assembly Stroke Bore - 489ci 4.250 4.165

The Eagle 42101040 is a complete Street & Strip rotating assembly designed for high-performance Chevrolet Big Block engines. This comprehensive kit delivers approximately 489 cubic inches of displacement when paired with a 4.165" bore, making it an excellent choice for enthusiasts seeking reliable performance and durability without breaking the bank.

Complete Assembly Includes:

• Cast steel crankshaft with 4.250" stroke for improved oiling and durability
• Eagle H-beam connecting rods measuring 6.735" center-to-center length
• 7/16" ARP 8740 chromoly bolts for superior clamping strength
• Keith Black hypereutectic aluminum pistons with inverted dome design
• Plasma-moly piston rings for excellent seal and longevity
• Premium rod and main bearings

Key Features:

• Designed for 4.165" bore applications (.030" overbore on standard 454 block)
• Cast steel crankshaft with .092" fillet radiuses for enhanced strength over OE cranks
• Forged steel H-beam connecting rods provide excellent strength-to-weight ratio
• Hypereutectic pistons offer superior wear resistance and heat dissipation
• Suitable for street performance and occasional strip use
• Unbalanced assembly - professional balancing required before installation

This rotating assembly is ideal for big block Chevy builds targeting reliable performance in the 450-550 horsepower range. Eagle Specialty Products manufactures high-strength connecting rods and crankshafts specifically engineered for racing and performance engines, ensuring quality and reliability for demanding applications.

Important: This kit does not include the letter "B" prefix in the part number, indicating it is shipped unbalanced and must be professionally balanced by a qualified machine shop before installation.