Edelbrock Part 15819 is a factory style 15 overdrive damper for the Ford 5.0L Coyote engine. It features a 7.75in. diameter 8 - rib design that delivers maximum traction and stability in supercharged applications. Can also be used with 6 - rib applications. It's an ideal solution for any supercharged application where a smaller pulley is not an option. This is the same damper used on our Edelbrock Coyote crate engine. This damper is SFI approved and recommended for supercharged applications only.