Eagle Chevy 409 4.000in Crank 6.135in I-Beam Rods 89.1cc Dome 4.380in Pistons Balanced Assembly

If you're building a high-performance Chevy 409 engine, a balanced rotating assembly is the foundation for reliable power. This assembly from Eagle includes a 4.000-inch stroke crankshaft, 6.135-inch I-beam connecting rods, and 4.380-inch pistons, all balanced together to reduce vibration and ensure smooth operation at higher RPMs. Getting the rotating assembly balanced from the start saves you time and ensures the critical internal components work in harmony.

Eagle is known for well-built engine components, and this assembly is no exception. The I-beam connecting rods are a strong choice for performance applications, offering a good balance of strength and weight. The pistons are designed for an 89.1cc combustion chamber, which will influence your final compression ratio depending on your cylinder heads. Having the entire assembly balanced as a unit is a crucial step that many builders overlook, but it's essential for engine longevity and performance, especially when pushing the limits of a classic V8 like the 409.

This balanced rotating assembly is a significant step towards a powerful and dependable engine build. Please note that this assembly is not CARB approved and cannot be shipped to California. It's always recommended to consult with your engine builder or refer to Eagle's specific installation guidelines for details on assembly and break-in procedures.