COMP Cams 821-1 Solid/Mechanical Lifter for Small and Big Block Chrysler 0.904 inches diameter; 124 gram weight; 1.63 inches seat height Manufactured using the tightest tolerances in the industry Lifter crown is ground to a precise radius for proper break-in and guaranteed long life Oil metering band is milled to the correct depth to prevent too much oil from being delivered to the top of the motor