Knucklehead-style rocker boxes for all Shovelhead engines. It is stupendous how effectively the right side engine appearance is changed and how fast your good old Shovel will become a center conversation piece on every bike meet. Installation is very simple due to exact fitment. No additional parts are required because the complete stock valve train can be retained. However, installation of the Knovelhead rockerboxes requires new oil lines. The manufacturer offers a nice solution: two braided steel lines with T-fitting made from billet aluminum, including all necessary fittings..