Sngl Grv Alt Pulley & Fa

The TRANS-DAPT single groove alternator pulley and fan assembly is a direct replacement component designed for engine builders, hot rodders, and mechanics seeking to optimize charging system efficiency in custom or restored vehicles. This pulley replaces factory multi-groove designs when switching to single-pulley alternator configurations, eliminating unnecessary belt paths and reducing drivetrain parasitic loss. Whether you're building a classic muscle car, modernizing a vintage engine, or streamlining a performance platform, this component provides the structural foundation needed for a clean, efficient belt-drive setup.

Engineered by TRANS-DAPT, a recognized manufacturer of engine accessories and pulley systems, the single groove alternator pulley integrates both the pulley rim and cooling fan into one compact assembly. The single groove design accommodates a standard alternator serpentine belt, reducing complexity and weight while maintaining proper tension characteristics. The integrated fan promotes efficient alternator cooling during extended operation, critical for high-output or high-ambient-temperature applications. Precision machining ensures concentricity and balance, preventing vibration that can lead to belt wear or alternator bearing stress. At just 0.9 lbs, the assembly adds minimal rotating mass while delivering dependable performance in demanding engine bay environments.

This pulley benefits restoration projects, engine swaps, and custom builds where factory multi-belt configurations don't suit the application. Installation typically requires removal of the existing alternator pulley and fan assembly, then pressing or bolting the new unit onto the alternator shaft—a straightforward task for anyone with basic mechanical skills and access to a pulley puller. Verify alternator shaft diameter and keyway configuration before ordering to ensure proper fitment. The compact 5.8 x 11.7 inch profile fits within most engine bay constraints, making it suitable for both traditional V8 builds and compact motor conversions where space optimization is essential.