Vortech Superchargers 10-Rib Pulley Pack 3.33" Underdrive (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) 8E020-333
3.33" 10-Rib Underdrive Pulley Pack for 1986-1993 Mustang 5.0
The Vortech Superchargers 10-Rib Pulley Pack (PN 8E020-333) is engineered for 1986-1993 Ford Mustang 5.0L applications running underdrive accessory configurations. This pulley pack is ideal for Fox Body Mustang builds that require 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 drive to a 10-rib system or dialing boost up or down on an existing underdrive setup, this Vortech pulley pack provides the necessary components to properly configure your supercharger drive with increased belt contact and long-term reliability.
Underdrive-Specific 10-Rib Design
This 3.33" underdrive pulley pack is designed for Mustangs equipped with underdriven accessories, where accessory speeds are reduced compared to factory configurations. The 10-rib belt interface delivers significantly 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 to ensure correct belt tracking, durability, and predictable boost delivery.
Performance & Capability
- Pulley Diameter: 3.33 inches
- Belt Drive: 10-Rib
- Accessory Configuration: Underdrive
- 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 underdrive accessory configurations. When converting to a 10-rib drive system 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: 8E020-333
- Product Type: Supercharger Pulley Pack
- Pulley Diameter: 3.33"
- Belt Type: 10-Rib
- Accessory Drive: Underdrive
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 in a 10-rib configuration?
A 3.33" pulley helps reduce peak boost compared to smaller diameters while still providing maximum belt grip and stability with a 10-rib drive. - Can this pulley pack be used on non-underdrive systems?
No. This pulley pack is engineered specifically for underdrive accessory configurations and should not be used on non-underdrive setups.
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
