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1. Overhead Camshaft: The camshaft (or camshafts depending on the design employed) is located above the valves within the cylinder head, and operates either indirectly or directly on the valves.
2. Cam-in-block: The camshaft is located within the engine block, and operates directly on the valves, or indirectly via pushrods and rocker arms. Because they often require pushrods they are most often called pushrod engines.
3. Camless: This layout uses no camshafts at all. Technologies such as solenoids are used to individually actuate the valves.
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