Anti rotation pins hydraulic tappet assembly +.002"

+0.002" oversized diameter. 2 used. OEM replacement reference 18535-99 Excessive engine noise can be produced when there is excess clearance between the lifters and the anti-rotation pins. The excessive clearance allows the lifters to rock back and forth, which not only produces physical noise from the lifter rocking side to side, it can also lead to premature roller failure and even pin failure. Create a balanced and quiet engine with proper lifter anti-rotation pin clearance. Feuling recommends a max clearance of 0.002"-0.003".