Final answer:
The statement is true; an integral valve guide is part of the cylinder head casting and is formed as one piece with it.
Step-by-step explanation:
True, a valve guide that is part of the cylinder head casting is called an integral valve guide. This means that the guide is formed as one piece with the cylinder head and cannot be removed without machining. This is different from a press-fit or replaceable valve guide which can be replaced if it wears out or is damaged. The use of integral valve guides is a design choice that can affect the repairability and the manufacturing process of an engine.