Big Block and FE 390-428, 429, 460, Retro-Fit Roller Lifter for Early Model Blocks Originally Equipped with Flat Tappet Cam< ul>< li> Performance replacement for stock hydraulic Roller lifters or retro-fit hydraulic Roller lifters for non-Roller blocks< li> Decrease friction and increase longevity when directly compared to flat tappet lifters. Accept much more aggressive Cam profiles than flat tappet lifters will allow
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