Eagle Chevy 409 4.000in Crank 6.135in I-Beam Rods 89.1cc Dome 4.350in Pistons Balanced Assembly

This is a balanced rotating assembly from Eagle, specifically built for Chevy 409 applications. It includes a 4.000-inch stroke crankshaft, 6.135-inch I-beam connecting rods, and 4.350-inch bore pistons with 89.1cc domes. This assembly is pre-balanced, which is a critical step in ensuring smooth engine operation and longevity, especially in higher-performance builds. Getting the balance right from the start saves significant machine shop time and ensures your engine runs true.

Eagle has put together a solid package here for those looking to build or rebuild a classic 409ci Chevy engine. The I-beam connecting rods are a strong choice for many performance applications, offering a good balance of strength and weight. The 89.1cc dome pistons are designed to work with the 4.000-inch stroke crank and the specific cylinder head volume to achieve a target compression ratio, though the exact ratio will depend on your chosen cylinder heads. This assembly is balanced as a complete unit, meaning the crankshaft, rods, pistons, rings, and bearings are all weighted and matched to work together harmoniously. This attention to detail is crucial for reducing engine vibration and stress on internal components.

When ordering this assembly, remember that it is not CARB approved and cannot be shipped to California. It's always a good idea to confirm all necessary components for your specific build, such as main bearings, rod bearings, piston rings (if not included), and any necessary assembly lubricants, to ensure a smooth installation process. This balanced rotating assembly is a foundational piece for a powerful and reliable Chevy 409 engine.