Competition Cams 821-16 Solid/Mechanical Lifters for Small and Big Block Chrysler and 426 Hemi .904 diameter; 124g weight; 1.63 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