Vortech Superchargers 10-Rib Pulley Pack 3.33" Underdrive 8" Crank (1986 Ford Mustang / 1987 Ford Mustang / 1988 Ford Mustang / 1989 Ford Mustang / 1990 Ford Mustang / 1991 Ford Mustang / 1992 Ford Mustang / 1993 Ford Mustang 5.0) 8E021-333
3.33" 10-Rib Underdrive Pulley Pack for 8" Crank Fox Body Mustang 5.0
The Vortech Superchargers 10-Rib Pulley Pack (PN 8E021-333) is engineered for 1986-1993 Ford Mustang 5.0L applications using an underdrive accessory configuration with an 8" crank pulley. This pulley pack is ideal for Fox Body Mustang builds that demand maximum belt traction and consistent boost control while slightly reducing peak boost compared to smaller pulley diameters.
Whether you're upgrading from a 6-rib or 8-rib system to a 10-rib drive or fine-tuning boost on an existing underdrive setup with an 8" crank, this Vortech pulley pack provides the correct components to configure your supercharger drive for durability, belt stability, and predictable performance.
Underdrive 10-Rib Design for 8" Crank Applications
This 3.33" underdrive pulley pack is specifically matched to 8" crank pulley configurations, where accessory speeds are reduced compared to factory setups. The 10-rib belt interface delivers substantially greater surface contact than 6-rib and 8-rib systems, helping eliminate belt slip under higher load and RPM conditions.
Pulley diameter and spacing are matched to Vortech's underdrive drive system geometry for 8" crank applications, ensuring proper belt tracking, long-term reliability, and consistent boost characteristics.
Performance & Capability
- Pulley Diameter: 3.33 inches
- Belt Drive: 10-Rib
- Accessory Configuration: Underdrive
- Crank Pulley Requirement: 8" crank
- Boost Control: Allows fine boost tuning with maximum belt grip
Application Notes
This pulley pack is intended exclusively for 1986-1993 Mustang 5.0L vehicles running an underdrive accessory system with an 8" crank pulley. When converting to a 10-rib drive or changing pulley diameter, proper belt length and compatible supporting components must be verified to ensure correct fitment and reliable operation.
Quick Specs
- Manufacturer: Vortech Superchargers
- Part Number: 8E021-333
- Product Type: Supercharger Pulley Pack
- Pulley Diameter: 3.33"
- Belt Type: 10-Rib
- Accessory Drive: Underdrive
- Crank Pulley Compatibility: 8" crank
Emissions & Legal Notice
- NOT AVAILABLE OR LEGAL FOR SALE IN CALIFORNIA
- For off-road and competition use only
- Installation on emissions-controlled vehicles driven on public roads may violate U.S. federal emissions law
Fitment
- 1986 Ford Mustang 5.0L
- 1987 Ford Mustang 5.0L
- 1988 Ford Mustang 5.0L
- 1989 Ford Mustang 5.0L
- 1990 Ford Mustang 5.0L
- 1991 Ford Mustang 5.0L
- 1992 Ford Mustang 5.0L
- 1993 Ford Mustang 5.0L
FAQs
- Why choose a 3.33" pulley with a 10-rib drive?
A 3.33" pulley reduces peak boost compared to smaller sizes while still providing maximum belt grip and stability with a 10-rib system. - Can this pulley pack be used with smaller crank pulleys?
No. This part number is engineered specifically for 8" crank pulley configurations and should not be used with other crank sizes.
Why Buy from Beefcake Racing?
Beefcake Racing is an authorized Vortech Superchargers dealer with extensive experience supporting Fox Body Mustang supercharger builds. From pulley sizing to complete belt drive planning, we help ensure every component is correctly matched for reliable, repeatable performance.
Email: sales@beefcakeracing.com
Phone: 1-855-827-7223
CA Residents: WARNING: Cancer and Reproductive Harm www.P65Warnings.ca.gov
