OE-Style Hydraulic Roller Lifters (No Link Bar) are a performance replacement for stock hydraulic Roller lifters or retro-fit hydraulic Roller lifters for non-Roller blocks with necessary hardware. Decrease friction and increase longevity when compared to flat tappet lifters. Accept much more aggressive Cam profiles than flat tappet lifters will allow. Applications: Ford Small Block: Use in blocks originally equipped with Roller Cam or use COMP Cams Retro-Fit Kit for flat tappet 289-302, 351W, 351C, 351M and 400M. Specifications: .875" Diameter, 135g Weight, 2.60" Seat Height.