Hydraulic Roller Lifters for Chevy Big Block V8 BBC 396- 454 402 427 19652000 06730012Introductions: Our hydraulic roller lifters are designed for use with standard factory alignment bars (on engines originally equipped with hydraulic roller lifters). These precision valved heavy duty lifters are a drop in replacement for OEM applications, they have vertical alignment bars and are designed for engines that did not originally come with hydraulic rollers, such as small and big block Chevys, Fords and Mopars. they can also be used to