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Patch - FLATHEAD
SKU: oldstock patch-561Approx. 8 x 4 cm
A flathead engine, otherwise sidevalve engine,[1][2] 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.
Flatheads are an early design concept that has mostly fallen into disuse, but they are currently experiencing a revival in low-revving aero-engines such as the D-Motor.[3]