S&S Quickee pushrods can be installed from an assembled engine! S&S Quickee pushrods are designed for use with 1984-up hydraulic tappets. They are not compatible with stock or aftermarket hydraulic tappets for shovelhead engines or most solid style tappets. 1984-'99 style pushrod covers are required for access to the Quickee Pushrod adjusters in 1999-up big twins. These are special order pushrods. Available through S&S dealers only, contact your local dealer for specific application.