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OE HYD. ROLLER LIFTERS - Hydraulic Roller Lifters; Chevrolet Big Block Gen VI & 8.1L Use in Blocks Originally Equipped w/ Hydraulic Roller Cam (1996-Present) Performance replacement for stock hydraulic roller lifters or retro-fit hydraulic roller lifters for non-roller blocks Decrease friction and increase longevity when directly compared to flat tappet lifters Accept much more aggressive cam profiles than flat tappet lifters will allow |