Eagle CRS5137S4D 4-Cylinder Competition Rotating Assembly with 4th Gen H-Beam Rods

The Eagle CRS5137S4D is a complete competition rotating assembly engineered for 4-cylinder performance engine builds. Designed and manufactured by Eagle Specialty Products — the world's largest aftermarket connecting rod manufacturer — this assembly delivers the strength, precision, and reliability demanded by high-performance street and racing applications.

This assembly is built around Eagle's 4th Generation H-Beam connecting rods (denoted by the "4D" suffix), which represent the latest evolution in Eagle's H-Beam rod technology. The 4D rods offer improved strength and durability over the previous 3rd generation design, making them well-suited for forced induction, nitrous, and high-horsepower builds.

Key Features:

• 4th Generation H-Beam Connecting Rods — Eagle's latest and strongest H-Beam rod design
• 5.137" Rod Center-to-Center Length — precision-matched for proper piston positioning and rod ratio
• Forged 4340 Steel Crankshaft — high-tensile alloy steel for superior strength over cast iron OEM cranks
• ARP Rod Bolts — premium fasteners for reliable clamping force under high-RPM and high-boost conditions
• Premium Pistons — matched to the assembly for optimal compression and clearances
• Plasma-Moly File-Fit Piston Rings — designed for optimum ring seal and reduced friction
• King or Clevite Rod and Main Bearings — name-brand bearings included for complete assembly convenience
• Factory Test-Fitted — all Eagle rotating assemblies are test-fitted in-house to verify fitment before shipment

Eagle rotating assemblies are available balanced or unbalanced, giving builders the flexibility to have their machine shop perform final balancing if preferred. This kit provides everything needed to assemble the short block, delivering a significant upgrade over stock components for builds targeting maximum performance and reliability.