10-1957 Panhead assembled cylinder head set

If you're looking to wake up a tired motor or starting a fresh build, this fully assembled cylinder head set is exactly what the doctor ordered for 1955-1962 FL Panhead models. These heads are built to breathe better than the originals, featuring larger Shovelhead-style intake valves and Panhead exhaust valves. They come ready to bolt on with cast iron valve guides for long-term durability and nitrated valves with modern seals. The springs and collars are set up to handle a maximum valve lift of .425 inches. These aluminum castings maintain the OEM look with stock O-ring style manifold intakes and standard exhaust ports, but they use 1975-later Shovelhead long-reach spark plugs for better ignition. Sold as a pair.