S&S, Shovel to Panhead cyl. head conversion kit. 3-5/8"

3-5/8 big bore. Used to run a Shovel with Panhead style heads. Cylinder head conversion kit for 66-84 Shovelheads. This are Panhead look alike heads; as used by S&S on their P-series engines. These are actually S&S Shovelhead based heads with just a Panhead rocker cover so the whole set-up is basically identical as would be done with S&S Shovelhead heads. The valve train drive technique is based on the Evo Big Twin; so Evo hydraulic units; Evo billet tappet guides; Quickee pushrods with through the pushrod top end oiling; specialty P-Series rocker shafts; rocker cradle and S&S Shovel roller rocker arms are used. Will fit Shovelhead cylinders since the stock Shovel head bolt pattern and the stock Shovel style fire-ring is used. For intake stock Shovel O-ring style intake manifolds can be used. The exhaust mounting style is stock Shovelhead as well. Heads come complete with valves and a .590" lift valve spring kit installed. Kit comes complete as shown. Note: You may need to order separately one or more of the following parts: 1) 66-E78 O-ring style manifold. 2) 70-E78 stock engines require a L78-87 style pinion gear since an Evo B.T. cam must be used. 3) 84-99 Evo B.T. style camshaft. 4) 66-69 stock engines require a special generator style cam with 84-99 style lobes.