Edelbrock's high performance hydraulic roller lifters for small-block Chevy, w-series Chevy, big-block Chevy, big-block Chrysler, small-block Ford & fe Ford are the perfect match for street & high performance applications.w/ unsurpassed tolerance capable of high rpm power, these precision self-aligning retro-fit hydraulic roller lifters are designed for use in early model non-roller engine blocks originally equipped w/ conventional lifters.