Eagle Chevy 400 3.750in Crank 5.700in I-Beam Rods -23cc 4.185in Pistons Balanced Assembly

If you're building a street-focused Chevy 400 engine that needs to run on pump gas and be naturally aspirated, this balanced rotating assembly from Eagle is a solid foundation. It's put together with components designed for reliable performance in everyday driving conditions, giving you a strong starting point for your project.

This assembly includes a 3.750-inch cast crankshaft and 5.700-inch I-beam connecting rods, which are secured with 3/8-inch ARP 8740 bolts. The pistons are forged 4032 aluminum from Icon, featuring a -23cc inverted dome design and a 4.185-inch bore size. They come with plasma-moly file-fit rings, meaning you can precisely gap them to your application for optimal sealing. King SI rod and main bearings are also included, ensuring proper lubrication and reduced friction for the rotating assembly.

Everything in this kit is balanced as an assembly, which is a critical step for reducing engine vibration and improving overall smoothness and longevity. This balanced rotating assembly is intended for naturally aspirated street applications and is not CARB approved, so it cannot be shipped to California. Always refer to the manufacturer's installation instructions for proper assembly and break-in procedures.