10-1086 - Panhead Cylinder Heads 3-5/8 Big Bore

V-Twin Motor Shop Ready single plug type Panheads are for use with Big Bore shovel head cylinders only. Comes assembled and are ready to install. Heads are assembled with cast iron guides valve stem seals nitrated valves Shovelhead intake and Panhead exhaust stock style springs and retainers. Features Shovelhead exhaust pipe flange and intake ports accept. Shovelhead o-ring type manifolds. Matched rocker arm assemblies are installed with heat treated studs nuts and oilers. Panheads feature external oiler for Big Bore applications with up to a .450 lift cam. Order o-ring type intake manifold separately. These heads also accept 3-5/8 inch big bore Shovelhead cylinders with 98.6mm cylinder flange. Top oiler holes have a 1/8 inch National Pipe Thread. 1/8 inch National Pipe Thread pipe plugs are installed.