1979-1993 Ford 5.0L Steel Serpentine 20% Underdrive Pulley Set Black Upgrade a standard C4

Upgrade a standard C4

from performance street to competition use

Made from totally new components

6" diameter ring gear

They're made to replace defective or damaged pickups in all Speedmaster 6000 series 8 cylidner series distributors

1979-1993 Ford 5.0L Steel Serpentine 20% Underdrive Pulley Set Black Upgrade a standard C4Speedmaster underdrive pulley kits are built from aircraft quality material andcomputer machined. By reducing the speed of the accessories, these underdrive pulleys free up an average of 8 15 horsepower , while retaining full cooling and charging characteristics. Most kits can be bolted on in less than 30 minutes.