Eagle B13021L03068 Small Block Chevy CI Balanced Rotating Assembly - 355

The Eagle B13021L03068 is a balanced Street Performance rotating assembly designed for Small Block Chevrolet engines with 2-piece rear main seal applications. This complete assembly is engineered for reliability and performance in engines producing up to 500 horsepower.

Complete Assembly Includes:

• Eagle cast steel crankshaft with 3.480-inch stroke
• Eagle SIR (Super I-Beam Rod) forged 5140 steel connecting rods with 5.700-inch center-to-center length
• 3/8-inch ARP 8740 connecting rod bolts for enhanced strength
• Hypereutectic aluminum pistons with flat top design
• Plasma-moly piston rings with standard gap
• King SI series connecting rod and main bearings
• 168-tooth automatic transmission flexplate for external balance

Key Specifications:

• Displacement: 355 cubic inches at 4.030-inch bore
• Stroke: 3.480 inches
• Rod Length: 5.700 inches
• External balance configuration
• Factory balanced—no additional balancing required

This assembly is ideal for street performance and mild strip applications. The part number beginning with "B" indicates this kit is professionally balanced by Eagle and ready to install. Compatible with 2-piece rear main seal Small Block Chevy blocks.