Standard size replacement. Dimensions: 1.715" head dia. x .3100" stem dia. Standard overall length. Severe Duty valves. Proven quality over many years. Manufactured from high temperature stainless alloy to a perfect finish. Manley valves feature swirl polished performance orientated shapes and durable chrome plated stems. Up to 30% weight reduction over stock components. Manleys Severe Duty valves insure a stable valve train even at high R.P.M.s. 1987 XL1100 88-03 all XL1200 (NU)