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 lifeApplicationsChryslerSmall Block V8 273-360Big Block V8 B Series 383-440 ('58+)Big Block V8 HEMI 426 Specifications .904" Diameter - 95g Weight - 1.63" Seat Height.