Street Performance .585" Valve Spring Kit for 2005-'18 Twin Cam 88® big twins w/ stock heads (both 7mm and 5/16" valve stems) and 2004-Up XL models. Single wire conical shape. Suitable for high performance applications. Accommodates camshaft lift to 0.585”. Kit contains: Valve Guide Seals, Springs, Top & Bottom Collars, Keepers, Shims.