An improved rocker arm adjusting nut characterized by an upper collar, a lower flange and an axially elongated body with a substantially cylindrical central section that is provided with knurling, or grooves in the axial direction. The upper collar and knurling deflect oil axially towards the lower flange when used according to its intended purpose with a stamped steel rocker arm, of conventional design. The enlarged mass and surface area of the adjusting nut helps both to dissipate temperature from the pivot ball-rocker arm interface, by conduction, and deflect oil towards the pivot ball-rocker arm interface.