Increase the Life of Your Stamped Steel Rocker ArmsAs oil is thrown off the pushrod, this lightweight aluminum deflector redirects the oil back to the fulcrum balls and valve springs to keep them cool and fully lubricated. Requires 3/8'' polylocks (not included). Will not work with stock rocker arm nuts. 0.100'' thick deflector simply mounts to the rocker studs on SB-Chevy/SB-Fords. Sold as a pair.