COMP Cams 2931-16 Solid/Mechanical Lifter for Ford Y-Block 292-312, (Set of 16) 0.498 inches diameter; 70 gram weight; 2.60 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