Solid/Mechanical Flat Tappet Lifters (16)Designed and manufactured using the tightest tolerances in the industry for ultra-precise constructionOil metering band is milled to exact depth to prevent too much oil from being delivered to the top of the engineFace of the lifter is ground to precise radius for proper break-in and guaranteed longer lifeApplicationsChevroletSmall Block V8 265-400Big Block V8 396-454Big Block V8 348-409 Specifications .842" Diameter - 98g Weight - 1.88" Seat Height.