Eagle 128264125 Chevy LS7 427ci Competition Rotating Assembly 8-Cylinder

The Eagle 128264125 is a competition-grade 8-cylinder rotating assembly engineered for the Chevrolet LS7 platform, displacing 427 cubic inches at the standard 4.125" bore. Designed to support demanding high-performance builds, this kit delivers the strength and precision required for serious street and track applications.

Key Features:

• Forged 4340 Steel Crankshaft – 4.000" stroke, center-counterweighted for superior strength and reduced rotating mass
• Eagle H-Beam Connecting Rods – 6.125" length, forged 4340 steel construction with 7/16" ARP 8740 rod bolts
• Premium Forged Pistons – Mahle or Arias forged pistons sized for 4.125" standard LS7 bore with 24-tooth reluctor compatibility
• File-Fit Piston Rings – Plasma-moly file-fit ring set included for precise gap setting
• High-Performance Bearings – Clevite or King rod and main bearings included
• Unbalanced Assembly – Designed for internal balance; professional machine shop balancing required prior to installation

Assembly Notes:

• All Eagle rotating assemblies are test-fitted in-house to ensure proper component fitment
• Flexplate, flywheel, and harmonic balancer are not included with internally balanced assemblies
• Verify reluctor ring tooth count, bore size, and cylinder head volume before ordering
• Eagle reserves the right to substitute pistons or bearings based on availability

The Eagle 128264125 competition rotating assembly is an ideal foundation for high-output LS7-based builds, combining forged internals and precision-matched components into a single, ready-to-assemble kit.