4in V-Belt Crank Pulley

The MOROSO 4in V-Belt Crank Pulley (MPN 23523) is a precision crankshaft pulley engineered for single-groove serpentine belt drive systems on high-performance and street engine builds. This lightweight aluminum pulley with black anodized finish delivers reliable accessory drive performance while maintaining the compact 4-inch diameter specification required for proper engine bay fitment and belt tension management.

Constructed from aluminum and finished in durable black anodize, this pulley features a 1-inch mandrel bore with 1/8-inch keyway for secure crankshaft engagement. The single V-belt groove is machined to OEM specifications, ensuring compatible fit with standard serpentine belt accessory drive configurations. At just 0.68 lbs, the lightweight design minimizes rotating mass on the crankshaft, reducing parasitic drag and supporting efficient engine operation. The anodized surface provides corrosion resistance and clean aesthetic appeal in engine bay displays.

This universal crank pulley is ideal for engine builders, hot rodders, and restoration enthusiasts upgrading or replacing worn factory pulleys. Street engines, mild stroker builds, and carbureted platforms commonly benefit from fresh pulley installation to ensure proper belt drive geometry and eliminate slippage that can occur with aged components. The MOROSO 4in V-Belt Crank Pulley solves both functional and aesthetic demands—delivering OEM-quality belt drive performance while supporting a finished engine presentation.

MOROSO is recognized within the performance automotive market for quality accessory drive components that meet the exacting standards of engine builders and restoration shops. This crank pulley represents the brand's commitment to precision manufacturing and reliable service life, backed by proper engineering fit for popular engine platforms.