ATI Super Damper Harmonic Balancer - 7.425" OD - SFI 18.1 - Steel - Black - External Balance - GM Duramax 2011-20 24-CHL-N-4 Start with a 1/4" center

Start with a 1/4" center hole and use the fixture to locate and drill 1/8" holes for mounting the springs

Kit includes two restrictors

Enjoy lifelong performance with a washable and reusable Pro 5R air filter

Prevent accidental reverse polarity

ATI Super Damper Harmonic Balancer - 7.425" OD - SFI 18.1 - Steel - Black - External Balance - GM Duramax 2011-20 24-CHL-N-4 Start with a 1/4" centerProduct Description: Harmonic Balancer Super Damper 7. 425 in OD SFI 18. 1 Steel Black Oxide External Balance GM Duramax 2011 20 Sold Individually ATI Performance Products is a company founded on innovation, precision and service. ATI harmonic Super Dampers add horsepower and torque to race, street and truck engines. ATI Performance Products is the creation of over 40 years of Transmission and performance component manufacturing and racing experience.