Whipple 12-Rib Marine Supercharger Pulley for 4.5L / W275AX

Whipple 12-Rib Marine Supercharger Pulley
4.5L / W275AX Applications

This Whipple 12-rib marine supercharger pulley is designed for compatible 4.5L / W275AX Whipple marine supercharger applications. Each pulley is machined from 6061-T6 billet aluminum and anodized for wear resistance and environmental protection in demanding performance and marine-use conditions.

The pulley design includes lightweight pocketing to help reduce rotating mass, a guarded outer profile to help reduce unwanted belt wandering during hard running, and engraved running diameter identification for easier service and setup verification. Pulley dimensions are based on the running diameter.

This product is available with finish and diameter options. Finish options include black, blue, and clear anodized. Available running diameters include 3.25", 3.50", 3.75", 4.00", 4.25", 4.50", 4.75", and 5.00".

General pulley sizing note: As a general rule of thumb, every 0.125" pulley change is approximately 0.75 PSI of boost change, increasing or decreasing depending on pulley direction and the full drive combination. Actual boost change can vary based on engine setup, supercharger configuration, belt system, operating conditions, calibration, and supporting hardware.

Application note: Whipple supercharger pulleys are application-specific. Verify pulley diameter, rib count, belt system, supercharger model, and application before ordering. Do not order this pulley for a different application unless compatibility has been confirmed.

Returns note: There are no returns or exchanges for used pulleys.

Key Features

• 12-rib marine supercharger pulley
• Designed for compatible 4.5L / W275AX Whipple supercharger applications
• Billet 6061-T6 aluminum construction
• Black, blue, and clear anodized finish options
• Available in 3.25", 3.50", 3.75", 4.00", 4.25", 4.50", 4.75", and 5.00" running diameters
• Engraved running diameter identification
• Lightweight pocketed design helps reduce rotating mass
• Guarded profile helps reduce belt wandering during hard running