Eagle 637914040 LS Pro Street Rotating Assembly 4.000" Stroke 408ci

The Eagle 637914040 is a complete Pro Street rotating assembly engineered for high-performance LS engine builds. This comprehensive kit provides a durable, cost-effective solution for enthusiasts building naturally aspirated or mildly boosted engines producing up to 750 horsepower.

Complete Assembly Includes:

• 4.000" stroke forged 4140 steel crankshaft with 24-tooth reluctor wheel and .092" radius fillets for enhanced strength
• 6.125" forged 4340 steel I-beam connecting rods with 7/16" ARP 8740 capscrew bolts
• DSS forged 4032 aluminum pistons with precision ring grooves
• File-fit piston ring set for precise end gap adjustment
• Rod and main bearings for complete installation

Key Features:

• Forged 4140 steel crankshaft delivers superior strength over cast cranks while remaining affordable
• Forged I-beam rods provide excellent durability for street/strip applications
• ARP 8740 bolts ensure reliable rod cap retention under high loads
• Internal balance design simplifies installation and reduces rotating mass
• 24-tooth reluctor compatible with most LS1, LS6, and 5.3L applications

This unbalanced assembly must be professionally balanced before installation. Designed for LS2, LQ4, LQ9, and similar Gen III/IV LS engines with 4.000" bore blocks. Displacement approximately 408 cubic inches at 4.030" overbore. Eagle Specialty Products manufactures high-quality rotating assemblies trusted by engine builders and performance enthusiasts worldwide.