1979-1993 Ford 5.0L Steel Serpentine 20% Underdrive Pulley Set Black Speedmaster Forged pistons are made

Speedmaster Forged pistons are made from 4032 aluminum alloy for quieter operation and reduced piston to wall clearance

the IAC valves adjust the airflow to improve motor idling

heat-treated

making them a great choice for your disc brake conversion

1979-1993 Ford 5.0L Steel Serpentine 20% Underdrive Pulley Set Black Speedmaster Forged pistons are madeSpeedmaster 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.