Fitment: 1966-'84 HD^® Big Twins. Convert any shovelhead engine to a quiet, dependable 1984-'99 style hydraulic valve train. Special polished billet tappet guides allow the use of late style tappets (included) and 198-'99 style cams. S&S^® Quickee pushrods can be installed quickly and easily. Top end oil can be fed through the pushrods if the engine is equipped with S&S^® roller rocker arms, or through the stock external oil line if using stock style rocker arms. Order the appropriate kit.