The cylinder head is usually cast in one piece from iron, from iron alloyed with other metals, or from aluminum alloy. Aluminum has the advantage of combining lightness with high heat conductivity .that is, an aluminum head tends to run cooler, other factors being equal. There are two types of head, L head and I head. Cylinder head contains water jackets for cooling in the assembled engine, these water jackets are connected through openings to the assembled engine. These water jackets are connected through openings to the cylinder-block water jackets. which one has the advantage of combining lightness with high heat conductivity? A. Steel B. Aluminum C. Cast iron