Factory iron liner 66mm bore cylinder w/ exhaust boost ports, pistons, rings, pins, modified stock head w/"top hat" style domes set up for +7mm (61 mm stroke) crankshaft. Ported for drag racing. Uses an aluminum spacer and two gaskets per cylinder for proper setup (gaskets should be replaced and I can supply these at no charge). If you want the ultimate sleeper with 417ccs of power put these cylinders on your bike and surprise some people. Recommended for use with 35mm or larger carbs and Shearer or GRR pipes for best power. The man I purchased these cylinders from ran 3.90s in 300ft with a +6 swingarm stock chassis, with a 125 lb rider. I am leaving racing and all my banshee parts must go!! Well trade &I give some cash for 421 cub cylinders
