Pulley Flange for 05-1338

The Pulley Flange for 05-1638 by Peterson Fluid is a precision press-fit accessory engineered for professionals and enthusiasts upgrading serpentine drive systems. This aluminum component serves as the critical interface between your engine's crank or accessory shafts and performance or OEM pulleys, making it essential for anyone rebuilding, modifying, or restoring a high-output powertrain. Whether you're installing a smaller underdrive pulley for weight reduction or integrating a larger diameter unit for improved cooling capacity, a quality pulley flange ensures concentricity and eliminates runout that can cause vibration, belt misalignment, and premature wear.

Constructed from lightweight aluminum and finished with a durable black anodized coating, the Pulley Flange accommodates 1-inch or 1.5-inch wide pulley applications with a press-fit design that locks the pulley securely to the shaft without relying on set screws or keys that can slip under load. The anodized finish resists corrosion and fretting wear, critical where the flange interfaces with the shaft and pulley bore, preserving both mechanical integrity and aesthetic appearance over thousands of engine cycles. Its compact footprint—measuring 4.4 by 4.55 inches with just 0.4 inches of axial thickness—makes it compatible with tight engine bay configurations while maintaining sufficient mass for balanced operation at elevated RPM.

This Peterson Fluid pulley flange is ideal for street performance builds, race engine assembly, and any application where factory pulley geometry needs updating. Mechanics and engine builders rely on Peterson components for the precision fit and repeatable results that factory assemblies often lack. Installation requires proper press equipment and understanding of pulley bore tolerances—oversizing or undersizing the flange diameter will compromise the fit. Verify your shaft diameter and pulley bore size before ordering to ensure correct fitment, and consider using a quality pulley puller for future service work to avoid damaging the flange or shaft.