Eagle 637914155 8-Cylinder Engine Rotating Assembly Kit

The Eagle 637914155 is an 8-cylinder engine rotating assembly kit from Eagle Specialty Products, a trusted name in high-performance engine building components. Designed to serve as the foundation of a fresh engine build or rebuild, this rotating assembly delivers the core internal components needed to get your engine back on the road or track.

Eagle rotating assemblies are test-fitted in-house to ensure all components work together correctly before shipment. Each kit is built around quality-matched parts selected to maximize performance, reliability, and durability across a wide range of applications.

Typical Kit Contents:

• Crankshaft (cast steel or forged 4340, depending on configuration)
• Connecting rods (I-Beam or H-Beam forged steel with ARP hardware)
• Pistons with wrist pins (hypereutectic or forged, depending on application)
• Piston rings (standard gap or file-fit)
• Rod and main bearings (King or Clevite)

Assembly Notes:

• Assemblies with part numbers beginning with “B” are pre-balanced by Eagle and require no additional balancing
• Unbalanced assemblies must be balanced by a qualified machine shop prior to installation
• Externally balanced assemblies include a Pioneer harmonic damper and flexplate where applicable
• Internally balanced assemblies do not include a flexplate or damper

Eagle Specialty Products offers this rotating assembly as part of their extensive lineup covering small block, big block, and LS-based 8-cylinder engines. Confirm the specific engine application, bore size, and stroke with your supplier before ordering to ensure correct fitment.