Vortech Superchargers 10-Rib Pulley Pack 2.75" 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) 8E021-275
2.75" 10-Rib Underdrive Pulley Pack for 8" Crank Fox Body Mustang 5.0
The Vortech Superchargers 10-Rib Pulley Pack (PN 8E021-275) is engineered for 1986-1993 Ford Mustang 5.0L applications running an underdrive accessory configuration with an 8" crank pulley. This pulley pack is intended for high-traction belt drive setups where consistent boost control and reduced belt slip are critical, especially in higher-output street/strip combinations.
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 includes the necessary components to properly configure your supercharger drive with maximum belt contact and long-term reliability.
Underdrive 10-Rib Design for 8" Crank Applications
This 2.75" 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 increased surface contact over 6-rib and 8-rib systems, helping maintain stable boost delivery 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, durability, and predictable boost characteristics.
Performance & Capability
- Pulley Diameter: 2.75 inches
- Belt Drive: 10-Rib
- Accessory Configuration: Underdrive
- Crank Pulley Requirement: 8" crank
- Boost Control: Enables precise 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 sizes, proper belt length and compatible supporting components must be verified to ensure correct fitment and reliable operation.
Quick Specs
- Manufacturer: Vortech Superchargers
- Part Number: 8E021-275
- Product Type: Supercharger Pulley Pack
- Pulley Diameter: 2.75"
- 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
- What does the 8" crank specification mean?
This pulley pack is designed to work with systems using an 8" crank pulley, which affects overall drive ratio and requires specific pulley sizing. - 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
