Feuling Anti-Rotation Lifter Pins For Harley Excessive clearance between the lifters and the anti-rotation pins might cause excessive engine noise. Excessive clearance permits the lifters to rock back and forth, causing not only physical noise from the lifter swaying side to side, but also premature roller and pin failure. Assist in the development of a balanced and quiet engine by ensuring correct lifter anti-rotation pin clearance. Features: Sold as pair Made in the USA