347s

The term "347s" most commonly refers to a specific type of Ford Flathead V8 engine. This engine, produced by Ford from 1932 to 1953, was a significant advancement in automotive technology and became a popular choice for hot rods and custom cars. The "347" designation specifically indicates a displacement of 347 cubic inches, which was achieved through modifications to the standard Flathead engine. These modifications typically involved increasing the bore and stroke of the cylinders, resulting in a larger engine displacement and potentially more power.

Ford Flathead V8 engines are characterized by their overhead valve design, where the valves are located in the cylinder head and operated by pushrods and rocker arms. This design was relatively advanced for its time. The "347" version, being a modified displacement, was not a factory offering but rather a popular aftermarket build. Enthusiasts would take standard Flathead engines and machine them to achieve the larger displacement, often for racing or performance applications. The iconic sound and customizable nature of the Flathead, including the 347 variant, have cemented its place in automotive history and popular culture.