Whipple 12-Rib 4-Bolt Marine Supercharger Pulley

Whipple 12-Rib 4-Bolt Marine Supercharger Pulley

This Whipple 12-rib 4-bolt marine supercharger pulley is designed for compatible Whipple marine supercharger belt-drive applications using 2.3L, 2.9L, 3.3L, and 4.0L Whipple superchargers. 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. Standard finish is hard coat black anodized, with blue finish available as an option. Available running diameters include 2.50", 2.625", 2.75", 2.875", 3.00", 3.125", 3.25", 3.375", 3.50", 3.625", 3.75", 3.875", 4.00", 4.125", 4.25", 4.375", 4.50", 4.625", 4.75", and 4.875".

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, and supporting hardware.

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

Fitment note: This pulley does not fit 4.5L / W275 superchargers.

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

Key Features

• 12-rib marine supercharger pulley
• 4-bolt pulley design
• Fits compatible 2.3L, 2.9L, 3.3L, and 4.0L Whipple superchargers
• Billet 6061-T6 aluminum construction
• Hard coat black anodized finish standard
• Blue finish option available
• Engraved running diameter identification
• Lightweight pocketed design helps reduce rotating mass
• Guarded profile helps reduce belt wandering during hard running
• Available in multiple running diameters from 2.50" to 4.875"
• Does not fit 4.5L / W275 superchargers