The cam-in-block engine is called an overhead cam engine, and the cam-in-head design is called a pushrod engine.

Question

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In an overhead cam (OHC) engine, the camshaft is located in the cylinder head above the combustion chamber, not in the block. A pushrod engine, also known as a cam-in-block engine, has the camshaft located in the engine block and uses pushrods to operate the overhead valves.

The Cam-In-Block Engine Is Called an Overhead Cam Engine, and the Cam-In-Head