Eagle 13021C040 Street Performance Rotating Assembly Kit 8-Cylinder +0.040 Bore

The Eagle 13021C040 is a Street Performance rotating assembly kit designed for 8-cylinder small block engines built to a +0.040" overbore. Engineered by Eagle Specialty Products — the world's largest aftermarket connecting rod manufacturer — this complete rotating assembly delivers a reliable, affordable foundation for street and mild performance engine builds.

This unbalanced assembly must be balanced by a qualified machine shop prior to installation. Eagle's Street Performance rotating assemblies are engineered for engines producing under 500 horsepower and are test-fitted in-house to ensure proper component fitment before shipping.

Kit Includes:

• Cast Steel Crankshaft — Reliable cast steel construction suited for street and street/strip applications
• Eagle SIR I-Beam Connecting Rods — Forged 5140 steel I-beam rods for dependable strength
• Hypereutectic Pistons — Precision-sized to +0.040" overbore for improved cylinder sealing
• Piston Rings — Matched rings included for a complete assembly
• Rod & Main Bearings — Quality bearings from Clevite or King included

Important Balancing Note: This assembly does not begin with "B" and is therefore unbalanced. It must be balanced by a qualified machine shop before installation. Internally balanced assemblies do not include a flexplate or harmonic damper.

Eagle rotating assemblies are a trusted choice for engine builders seeking proven performance components at an accessible price point for V8 street engine builds.