The cylinder head generally adopts cast iron or alloy cast iron, thermal conductivity Aluminum Alloy good, is conducive to improve the compression ratio. and it is part of the combustion chamber, a great impact on the work of the engine combustion chamber shape, the combustion of gasoline and diesel engines, the cylinder head is composed of a portion of the combustion chamber vary greatly. The main combustion chamber of gasoline engine in the cylinder cover, and the combustion chamber of diesel engine piston in the main pit at the top. we try our best suppling the best products . During the warranty period of products, the factory promise returned and guaranteed quality.