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3-5/8 big bore. Used to run a Shovelhead with Panhead style heads. Cylinder head conversion kit for 66-84 Shovelheadheads. This are Panhead look alike heads, as used by S&S on their P-series engines. These are actually S&S Shovelheadhead based heads with just a Panhead rocker cover so the whole set-up is basically identical as would be done with S&S Shovelheadhead 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 Shovelhead roller rocker arms are used. Will fit Shovelheadhead cylinders since the stock Shovelhead head bolt pattern and the stock Shovelhead style fire-ring is used. For intake stock Shovelhead O-ring style intake manifolds can be used. The exhaust mounting style is stock Shovelheadhead 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.
Fits: > 66-84 Shovelhead with 3-5/8" big bore cylinders (NU)
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