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In page Porsche 356:

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Porsche designers designed the 356's air-cooled pushrod OHV flat-four around the engine case originally designed for the Volkswagen Beetle, adding new cylinder heads, camshaft, crankshaft, intake and exhaust manifolds and dual carburetors, making 52 kW (70 hp) – more than double the Beetle's horsepower.[1] While the first prototype 356 had a mid-engine layout, all subsequent 356 engines were rear-mounted.[citation needed] The four-cam "Carrera" engine appeared in late 1955 as an extra cost option on the 356 A, and remained available through the 356 model run.[citation needed]