Eagle 638153780 8-Cylinder Engine Rotating Assembly Kit

The Eagle 638153780 is a complete rotating assembly kit engineered for 8-cylinder performance engine builds. Eagle Specialty Products is a well-established name in the performance aftermarket, producing high-strength rotating assemblies that serve as the foundation of reliable, high-output engines for street, street/strip, and competition applications.

Eagle rotating assemblies are test-fitted in-house to ensure all components work properly together before shipping. Each kit is built around a precision-machined crankshaft paired with connecting rods, pistons, rings, and bearings — providing everything needed to assemble a proven rotating package in one purchase.

Kit Typically Includes:

• Eagle crankshaft (cast steel or forged 4340 steel depending on configuration)
• Eagle connecting rods (I-Beam or H-Beam depending on application)
• ARP rod bolts
• Pistons suited to the intended application
• Piston rings (standard gap or file-fit)
• Rod and main bearings (King or Clevite)

Key Features:

• Components are test-fitted at the Eagle factory to verify fitment and compatibility
• Available in balanced or unbalanced configurations — balanced assemblies require no additional balancing before installation
• Externally balanced assemblies include a Pioneer harmonic damper and flexplate (or flywheel for select applications)
• Designed for a wide range of performance levels from street to all-out competition
• Crankshaft features smooth surface finishes for improved oil flow and reduced bearing wear

Eagle rotating assemblies are trusted by engine builders across street performance, drag racing, oval track, and road racing applications. Always verify bearing clearances and perform a proper mock-up prior to final assembly.