Whipple 3.875" 6-Rib 5-Bolt Supercharger Pulley 3.8L SCP-63875-5
Overview
The Whipple 3.875" 6-Rib Supercharger Pulley is designed for precise boost control and dependable belt management on Whipple 3.8L supercharger applications. CNC-machined from 6061-T6 billet aluminum and finished in a durable hard-coat black anodize, this pulley is built to handle sustained high RPM use in demanding street and track environments.
Whipple integrates lightweight pocketing to reduce rotating mass while maintaining structural integrity, along with a built-in belt-guard feature that helps prevent belt walk during aggressive acceleration. Each pulley is laser-engraved with its running diameter for quick identification when dialing in boost combinations.
Configured for a 6-rib belt system and a 5-bolt mounting pattern, the 3.875" pulley offers a reliable way to fine-tune blower speed. As a general guideline, every .125" change in pulley diameter equals roughly 1 PSI of boost, though actual results vary by engine and supporting mods.
Performance Highlights
- 6061-T6 billet aluminum construction
- 3.875" running diameter for Whipple 3.8L superchargers
- 6-rib design for stable belt engagement
- 5-bolt mounting pattern
- Hard-coat black anodized finish
- Lightweight pocketed design reduces rotating mass
- Integrated belt guard helps prevent belt wandering
- Laser-engraved diameter marking
Quick Specs
- Part Number: SCP-63875-5
- Pulley Diameter: 3.875 inches
- Belt Type: 6-Rib
- Mounting: 5-Bolt
- Material: 6061-T6 Billet Aluminum
- Finish: Black Anodized
- Application: Whipple 3.8L Supercharger Only
FAQs
How much boost change does a 3.875" pulley provide?
A common rule of thumb is about 1 PSI per .125" pulley size change. Actual boost will depend on engine setup, airflow, and supporting modifications.
Can this pulley be used on non-Whipple or other Whipple superchargers?
No. Whipple pulleys are application-specific and this model is designed exclusively for Whipple 3.8L superchargers.
Why Buy from Beefcake Racing?
Beefcake Racing offers genuine Whipple components backed by real-world experience and knowledgeable technical support. Whether youre refining a street setup or pushing limits at the track, were here to help. Call 1-855-827-7223 or email sales@beefcakeracing.com.
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