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Flathead engine
A type of four-stroke engine / From Wikipedia, the free encyclopedia
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A flathead engine, also known as a sidevalve engine[1][2] 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.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/e/e3/Single-cylinder_T-head_engine_%28Autocar_Handbook%2C_13th_ed%2C_1935%29.jpg/640px-Single-cylinder_T-head_engine_%28Autocar_Handbook%2C_13th_ed%2C_1935%29.jpg)
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/e/ed/Side-valve_engine_v2.png/640px-Side-valve_engine_v2.png)
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/5/54/Side-valve_engine_v3.png/640px-Side-valve_engine_v3.png)
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/5/52/Side-valve_engine_with_Ricardo%27s_turbulent_head_01.png/640px-Side-valve_engine_with_Ricardo%27s_turbulent_head_01.png)
Flatheads were widely used internationally by automobile manufacturers from the late 1890s until the mid-1960s[3] but were replaced by more efficient overhead valve and overhead camshaft engines. They are currently experiencing a revival in low-revving aero-engines such as the D-Motor.[4]