Direct replacement for 302-351W production small block hydraulic roller lifter applications Direct replacement for 302-351W production small block hydraulic roller lifter applications Use M-6500-R302H High Performance roller cam lifters for higher RPM and severe duty applications Uses production dog-bone type tie bars and retainer plate components included in M-6253-A50 Roller Cam Conversion Kit Sold in a set of 16 lifters PART NUMBER APPLICATION TYPE/DESCRIPTION M-6500-R302** All Roller Small Block Hydraulic roller lifter OEM replacement. M-6500-R302H All Roller Small Block High Performance hydraulic roller tappet recommended for performance and racing applications Direct OEM lifter size replacement