To assure consistent valve train operation under all conditions, S&S adjustable pushrods are manufactured from rigid chromoly steel tubing. The S&S design permits a simple, trouble free installation that does not require removal of the gas tank, rocker assemblies, or even the rocker box cover! OEM pushrods may be cut to permit removal without rocker disassembly. These pushrods fit 1999-'16 HD big twin engines with stock, 4.937" cylinders. 1984-'99 style pushrods covers required.