This kit contains the pieces required to install Comp Cam's complete line of hydraulic roller cams in 302, 351W, 351C and 351M-400 Ford engines that did not come with an OEM hydraulic roller cam. This kit works on all small block engines originally equipped with either a flat tappet or a roller cam. When using this kit in a non-roller block, it is necessary to use a small base circle cam to ensure the lifters will not rise out of the lifter bores. This kit must be used with Part # 249-851-16 lifters. All kits come complete with detailed instructions and all necessary hardware.