Eagle 637904125 Competition Rotating Assembly LS7 4.000" Stroke 4.125" Bore

The Eagle 637904125 is a high-performance competition rotating assembly specifically engineered for GM LS7 and LSX engines. This complete internal engine kit is designed for demanding racing applications including naturally aspirated, nitrous oxide, and forced-induction builds.

Key Specifications:

• 4.000" stroke forged 4340 steel crankshaft with 58-tooth reluctor
• 6.125" center-to-center forged 4340 H-beam connecting rods
• 7/16" ARP 2000 rod bolts for superior clamping force
• Diamond forged 2618 aluminum pistons with -23cc forced induction dome
• 4.125" bore diameter (LS7 standard bore)
• Premium performance bearings (King or Clevite)
• File-fit moly piston rings
• Internal balance design

Features and Benefits:

• Forged 4340 crankshaft undergoes multi-stage heat treatment, X-ray inspection, and sonic testing for maximum strength and reliability
• H-beam connecting rods feature precision cap alignment sleeves and silicon bronze bushings for full-floating pins
• 2618 forged aluminum pistons provide exceptional strength for high-boost and nitrous applications
• Chamfered oil holes on crankshaft improve oiling efficiency
• All journals precision-ground and micro-polished to less than 5 RA surface finish
• Rated for engines producing well over 500 horsepower

This Eagle Competition rotating assembly offers professional-grade strength and reliability at an affordable price point. The kit includes all necessary internal rotating components for a complete engine build. Note that assemblies not beginning with "B" in the part number require professional balancing before installation.