cycle-parts.com provides high quality, precision-performance cylinder heads for all motorcycle models. cylinder heads are found at the height of the combustion chamber and holds the miscellaneous valves, spark plug(s), and all other exhaust and intake accoutrements. three-valve cylinder heads are a new feature on some of the higher performing bikes now available. the tree-valve, twin-plug cylinder head provides smooth flow with reduced emissions and allows for higher gas mileage. also available are the accompanying insulator, booster cap, dowel pin and oil guide plate. everything you need to install your new cylinder head.