A single-piece cylinder head installed on an inline six-diesel engine will cover _______ cylinders.

The answer is based on the design of an inline six-cylinder diesel engine, which features a single cylinder head that encompasses all six cylinders. In this configuration, the cylinder head is a single component that is specifically designed to seal and cover the combustion chambers of all six cylinders simultaneously. This is in contrast to engines that might have multiple cylinder heads for fewer cylinders; however, in the case of an inline six-cylinder engine, the purpose of a single-piece cylinder head is to maintain structural integrity, optimize performance, and simplify the manufacturing process.

The layout of an inline engine means that the cylinders are arranged in a straight line, allowing for the cylinder head to efficiently cover each one without any interruption. This design choice aids in effective cooling, minimizes weight, reduces the complexity of the engine assembly, and enhances the overall performance of the engine.

In contrast to options referring to fewer cylinders, a single-piece cylinder head for less than six would not be applicable in the context of an inline six-cylinder diesel engine, as it would not effectively fulfill its role of sealing all combustion chambers and facilitating the engine's operation.