85-87 305-350 Chevy Alum Crankshaft Pulley

The MARCH Performance 85-87 305-350 Chevy Aluminum Crankshaft Pulley (Part No. 4021-08) is a precision-engineered accessory designed for small-block Chevy engine builds seeking reduced rotating mass and improved reliability. This 5.5-inch diameter pulley features a two-groove, six-rib configuration optimized for short water pump applications, making it an ideal choice for street performance, restoration, and high-RPM engine combinations.

Constructed from aluminum alloy and finished in durable black powder coat, this crankshaft pulley delivers weight savings compared to cast-iron alternatives while maintaining the structural integrity required for demanding engine speeds. The groove and rib pattern ensures proper belt alignment and secure grip on accessory drive systems, whether running a single serpentine belt or traditional V-belt configuration. The compact short water pump design accommodates tight engine bays typical of 1985–1987 Chevrolet applications, making fitment straightforward for both original restoration and modern engine swaps utilizing classic-era small-block platforms.

This pulley is specified for 305 and 350 cubic-inch Chevy engines, the most common small-block displacements in third-generation Chevrolet trucks and performance vehicles. Builders choosing aluminum crankshaft pulleys typically prioritize reduced engine parasitic load, improved throttle response, and minimized vibration transmission through the accessory drive. At 2.2 pounds, this component contributes meaningfully to overall rotating mass reduction in high-revving applications. MARCH Performance's engineering focus on OEM-compatible geometry and reliable manufacturing makes this pulley a proven upgrade path for restorers and performance enthusiasts seeking dependable ancillary components.