COMP Cams 841-16 Endure-X Solid Roller Lifter for Big Block Ford 429-460 with Captured Link Bar For Big Block Ford, 429-460 0.875 inches diameter; 108 gram weight; 2.01 inches seat height EDM Oil Injection technology guarantees that the bearing assembly receives constant, pressurized oil flow via precision hole aimed at the bearings Needle bearings are precision sorted by size to evenly distribute loads, which prevents premature wear and failure Durable axle is made from wear resistant tool steel to prolong the life of the roller assembly, especially in high rpm applications