ATI Shell Assy - 8.25 - Alum - 10 & 4 Grv - LS7 Y Body 10 Percent OD

What you get with this ATI Shell Assy is the main aluminum housing, designed for an 8.25-inch diameter damper. This specific assembly is built for LS7 Y Body applications and features a 10 percent overdriven pulley ratio, indicated by the '10 & 4 Grv' marking, meaning it has 10 grooves for the belt and a 4-groove secondary pulley. This part is crucial for managing torsional vibrations in high-performance engines.

This shell assembly is constructed from aluminum, which helps keep the overall weight down compared to heavier steel alternatives. The 10 percent overdrive means the accessory pulleys driven by the crankshaft will spin 10 percent faster than the crankshaft itself. This can be beneficial for ensuring accessories like alternators and water pumps keep up under demanding conditions, especially in racing or high-RPM scenarios. The 'Y Body' designation typically refers to specific GM vehicle platforms where this damper is intended to fit.

When installing this damper, ensure you have the correct tools for crankshaft pulley removal and installation. It's important to verify that this damper is compatible with your specific engine build and accessory drive setup. Refer to the manufacturer's installation instructions for detailed guidance on proper fitment and torque specifications to ensure optimal performance and longevity.