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1HD and 1HZ are engines with large displacement, big bore diameter, and high heat load. Therefore, welding, repair, reclaimed casting must be prohibited. There is one point that many sellers and buyers don't pay attention to about these two heads. That is the valve seat quality. Valve seat material of our 1HD and 1HZ cylinder head is high-chromium, and the coaxiality of the valve guide and the valve seat holes are well controlled. So that problems like valve seat subsidence, cylinder head compression descent etc. won't be happened. Part numbers: 11101-17010, 11101-17011, 11101-17012, 11101-17031, 11101-17020