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12 For this engine, Jeff uses a set of Street Series Retro-Fit hydraulic roller lifters from Howard’s Cams. They are designed for early- or late-model blocks, including blocks with tall lifter bosses. The lifters feature hardened and tempered steel alloy rollers, heat-treated stainless steel crossbars, and are intended for street applications up to 6,500 rpm. Before dropping them down into the lifter bores, Jeff soaks the rollers in oil to lube up the bearings.