Is it normal to have oil in a cylinder head if the intake gasket is bad?

No, it is not normal to have oil in a cylinder head if the intake gasket is bad. The intake gasket is located between the cylinder head and the intake manifold, and its primary function is to create a seal to prevent air and fuel from leaking out of the engine. If the intake gasket is bad, it could cause the engine to run lean (too much air and not enough fuel), which can lead to engine damage. In addition, a bad intake gasket can also cause oil to leak from the engine, which can lead to decreased performance and damage to other engine components. If you see oil in the cylinder head, it is important to have the intake gasket inspected and replaced if necessary.