Eagle B13009L03053 Street Performance Balanced Rotating Assembly Small Block Chevy - 8-Cylinder

The Eagle B13009L03053 is a Street Performance balanced rotating assembly engineered for 8-cylinder Small Block Chevrolet engines. Pre-balanced at the Eagle factory, this kit is ready to drop into your build without requiring additional machine shop balancing, saving time and cost on your engine project.

This assembly is built around a 3.480-inch stroke cast steel crankshaft paired with 5.700-inch Eagle SIR forged 5140 steel I-Beam connecting rods featuring 3/8-inch ARP 8740 fasteners. The kit includes hypereutectic aluminum pistons with a -9cc dish profile sized for a 4.030-inch bore, along with Hastings rings and matched rod and main bearings — everything needed for a complete rotating assembly installation.

Key Features:

• Pre-balanced by Eagle — no additional balancing required
• 3.480-inch stroke cast steel crankshaft
• 5.700-inch Eagle SIR I-Beam rods — forged 5140 steel with 3/8-inch ARP 8740 bolts
• Hypereutectic -9cc dish pistons — 4.030-inch bore
• Includes matched rod and main bearings and piston rings
• Externally balanced assembly includes 153-tooth Pioneer flexplate and harmonic damper
• Rated for engines producing up to 500 horsepower on pump gas
• Sold as a complete 8-cylinder kit

Eagle Specialty Products is one of the most recognized names in aftermarket rotating assembly components, delivering quality street and strip performance at an accessible price point. This assembly is ideal for builders looking for a reliable, performance-ready foundation for a Small Block Chevy street or mild strip application.