Flathead engine

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What Wikipedia says

A flathead engine, also known as a sidevalve engine or valve-in-block engine, is an internal combustion engine with its poppet valves contained within the engine block, instead of in the cylinder head, as in an overhead valve engine.

Excerpt from the Wikipedia article “Flathead engine”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Herranderssvensson, CC BY-SA 3.0, via Wikimedia Commons.